Two Higgs Doublet Model and Model Independent Interpretation of Neutral Higgs Boson Searches (2000)
Abbiendi, G, Ackerstaff, K, Ainsley, C, Åkesson, P F, Alexander, Gideon, Allison, J, ...
Searches for the neutral Higgs bosons h0 and A0, are used to obtain limits on the Type II Two Higgs Doublet Model (2HDM(II)) with no CP-violation in the Higgs sector and no additional particles...
Abbiendi, G, Ackerstaff, K, Ainsley, C, Åkesson, P F, Alexander, Gideon, Allison, J, ...
The inclusive production rate of phi mesons from the decay of b hadrons produced in Z0 decays was measured to be Br(b->phi+X) = 0.0282+-0.0013(stat.)+-0.0019(syst.), using data collected by the OPAL...
Abbiendi, G, Ackerstaff, K, Ainsley, C, Åkesson, P F, Alexander, Gideon, Allison, J, ...
The data recorded at a centre-of-mass energy of 189GeV by the OPAL detector at LEP are used to search for trilinear couplings of the neutral gauge bosons in the process e+e- --> Z-gamma. The...
Multiplicities of $\pi^{0}$, $\eta$, $K^{0}$ and of charged particles in quark and gluon jets (2000)
Abbiendi, G, Ackerstaff, K, Ainsley, C, Åkesson, P F, Alexander, Gideon, Allison, J, ...
We compared the multiplicities of pizero, eta, Kzero and of charged particles in quark and gluon jets in 3-jet events, as measured by the OPAL experiment at LEP. The comparisons were performed for...
Measurement of the Low-x Behaviour of the Photon Structure Function $F2-\gamma$ (2000)
Abbiendi, G, Ackerstaff, K, Ainsley, C, Åkesson, P F, Alexander, Gideon, Allison, J, ...
The photon structure function F2-gamma(x,Q**2) has been measured using data taken by the OPAL detector at centre-of-mass energies of 91Gev, 183Gev and 189Gev, in Q**2 ranges of 1.5 to 30.0 GeV**2...
Abbiendi, G, Ackerstaff, K, Ainsley, C, Åkesson, P F, Alexander, Gideon, Allison, J, ...
Searches for final states expected in models with light gravitinos have been performed, including experimental topologies with multi-leptons with missing energy, leptons and photons with missing...
A measurement of the $\tau$ mass and the first CPT test with $\tau$ leptons (2000)
Abbiendi, G, Ackerstaff, K, Ainsley, C, Åkesson, P F, Alexander, Gideon, Allison, J, ...
We measure the mass of the tau lepton to be 1775.1+-1.6(stat)+-1.0(sys t.) MeV using tau pairs from Z0 decays. To test CPT invariance we compare the masses of the positively and negatively charged...
Photonic events with missing energy in $e^{+}e^{-}$ collisions at $\sqrt{s}=189 GeV$ (2000)
Abbiendi, G, Ackerstaff, K, Ainsley, C, Åkesson, P F, Alexander, Gideon, Allison, J, ...
Photonic events with large missing energy have been observed in e+e- collisions at a centre-of-mass energy of 189GeV using the OPAL detector at LEP. Results are presented for event topologies...
Z boson pair production in $e^{+}e^{-}$ collisions at $\sqrt{s}$ = 183 and 189 GeV (2000)
Abbiendi, G, Ackerstaff, K, Åkesson, P F, Alexander, Gideon, Allison, J, Anderson, K J, ...
A study of Z boson pair production in e+e- annihilation at center-of-mass energies near 183 GeV and 189 GeV is reported. Final states containing only leptons, (l+l-l+l- and l+l-nu nubar), quark and...
Measurement of |$V_{cb}$| using $\overline{B}^{0} \to D^{*+}l^{-}\overline{\nu}$ decays (2000)
Abbiendi, G, Ackerstaff, K, Åkesson, P F, Alexander, Gideon, Allison, J, Anderson, K J, ...
The magnitude of the Cabibbo-Kobayashi-Maskawa matrix element Vcb has been measured using B0 to D*l nu decays recorded on the Z0 peak using the OPAL detector at LEP. The D* to D0 pi+ decays were...
Transverse and Longitudinal Bose Einstein Correlations in hadronic $Z^0$ Decays (2000)
Abbiendi, G, Ackerstaff, K, Åkesson, P F, Alexander, Gideon, Allison, J, Anderson, K J, ...
Bose-Einstein correlations in pairs of identical charged pions produced in asample of 4.3 million Z0 hadronic decays are studied as a function of the threecomponents of the momentum difference,...
Abbiendi, G, Ackerstaff, K, Åkesson, P F, Alexander, Gideon, Allison, J, Anderson, K J, ...
The cross-section ratio Rb=sigma(e+e- to b-antib)/sigma(e+e- to q-antiq) andthe bottom and charm forward-backward asymmetries AFB^b and AFB^c are measuredusing event samples collected by the OPAL...
Search for new Physics in rare B Decays (2000)
Abbiendi, G, Ackerstaff, K, Åkesson, P F, Alexander, Gideon, Allison, J, Anderson, K J, ...
A search for the decay B+- to K+-K+-pi-+ was performed using data collected by the OPAL detector at LEP. These decays are strongly suppressed in the Standard Model but could occur with a higher...
QCD studies with $e^{+}e^{-}$ annihilation data at 172-189 GeV (2000)
Abbiendi, G, Ackerstaff, K, Åkesson, P F, Alexander, Gideon, Allison, J, Anderson, K J, ...
We have studied hadronic events from e+e- annihilation data at centre-of-mass energies of sqrt{s}=172, 183 and 189 GeV. The total integrated luminosity of the three samples, measured with the OPAL...
Search for new Physics in rare B Decays (2000)
Abbiendi, G, Ackerstaff, K, Åkesson, P F, Alexander, Gideon, Allison, J, Anderson, K J, ...
A search for the decay B+- to K+-K+-pi-+ was performed using data collected by the OPAL detector at LEP. These decays are strongly suppressed in the Standard Model but could occur with a higher...
Leading Particle Production in Light Flavour Jets (2000)
Abbiendi, G, Ackerstaff, K, Åkesson, P F, Alexander, Gideon, Allison, J, Anderson, K J, ...
The energy distribution and type of the particle with the highest momentum in quark jets are determined for each of the five quark flavours making only minimal model assumptions. The analysis is...
Pfeifenschneider, P, Biebel, O, Movilla-Fernández, P A, Abbiendi, G, Ackerstaff, K, Åkesson, P F, ...
We employ data taken by the JADE and OPAL experiments for an integrated QCD study in hadronic e+e- annihilations at c.m.s. energies ranging from 35 GeV through 189 GeV. The study is based on...
Search for Unstable Heavy and Excited Leptons at LEP2 (2000)
Abbiendi, G, Ackerstaff, K, Åkesson, P F, Alexander, Gideon, Allison, J, Anderson, K J, ...
Searches for unstable neutral and charged heavy leptons, N and L+-, and for excited states of neutral and charged leptons, nu*, e*, mu*, and tau*, have been performed in e+e- collisions using data...
Abbiendi, G, Ackerstaff, K, Åkesson, P F, Alexander, Gideon, Allison, J, Anderson, K J, ...
Bose-Einstein correlations in pairs of charged kaons produced in a sample of 3.9 million hadronic Z0 decays have been measured with the OPAL experiment at LEP. Charged kaons were identified in the...
A low cost I/O concentrator using the CAN fieldbus (1999)
Hallgren, Björn I, Bähler, P, Burckhart, Helfried J, Filimonov, V, Hallewell, G D, Karlov, A A, ...
The I/O channels of the control system of the LHC experiments are distributed over the whole detector volume with distances of up to 100 meters. Special requirements on the I/O system arise due to...
$\tau$ decays with neutral kaons (1999)
Abbiendi, G, Ackerstaff, K, Åkesson, P F, Alexander, Gideon, Allison, J, Anderson, K J, ...
The branching ratio of the tau lepton to a neutral K meson is measured from a sample of approximately 200,000 tau decays recorded by the OPAL detector at centre-of-mass energies near the Z0...
Abbiendi, G, Ackerstaff, K, Åkesson, P F, Alexander, Gideon, Allison, J, Anderson, K J, ...
The inclusive production of D*+- mesons in photon-photon collisions has been measured using the OPAL detector at LEP at e+e- centre-of-mass energies of 183 and 189GeV. The D* mesons are reconstructed...
Front-end I/O of the ATLAS Detector Control System (1999)
Burckhart, Helfried J, Hallgren, Björn I
The importance of using a powerful Detector Control System (DCS) has much increased with the size and complexity of High-Energy Physics detectors. The generation of detectors for the LHC experiments...
Abbiendi, G, Ackerstaff, K, Åkesson, P F, Alexander, Gideon, Allison, J, Anderson, K J, ...
A study of W+W- events accompanied by hard photon radiation produced in e+e- collisions at LEP is presented. Events consistent with two on-shell W-bosons and an isolated photon are selected from...
Precision Luminosity for $Z^{0}$ Lineshape Measurements with a Silicon-Tungsten Calorimeter (1999)
Abbiendi, G, Ackerstaff, K, Alexander, Gideon, Allison, J, Anderson, K J, Anderson, S, ...
The measurement of small-angle Bhabha scattering is used to determine the luminosity at the OPAL interaction point for the LEP I data recorded between 1993 and 1995. The measurement is based on the...
Search for Chargino and Neutralino Production at $\sqrt{s} = 189 GeV$ at LEP (1999)
Abbiendi, G, Ackerstaff, K, Alexander, Gideon, Allison, J, Anderson, K J, Anderson, S, ...
A search for charginos and neutralinos, predicted by supersymmetric theories, is performed using a data sample of 182.1 pb-1 taken at a centre-of-mass energy of 189 GeV with the OPAL detector at LEP....
Abbiendi, G, Ackerstaff, K, Alexander, Gideon, Allison, J, Anderson, K J, Anderson, S, ...
A selection of di-lepton events with significant missing transverse momentum has been performed using a total data sample of 237.4 pb-1 at e+e- centre-of-mass energies of 183 GeV and 189 GeV. The...
A Study of Three-Prong $\tau$ Decays with Charged Kaons (1999)
Abbiendi, G, Ackerstaff, K, Alexander, Gideon, Allison, J, Anderson, K J, Anderson, S, ...
From an analysis of the ionisation energy loss of charged particles selected from a sample of 147926 e+e- -> tau+tau- candidates recorded in the OPAL detector at e+e- centre-of-mass energies near the...
Abbiendi, G, Ackerstaff, K, Alexander, Gideon, Allison, J, Anderson, K J, Anderson, S, ...
A search for pair-produced leptoquarks has been performed using a sample of e+e- collision events collected by the OPAL detector at LEP at e+e- centre-of-mass energies of about 183 GeV. The data...
Abbiendi, G, Ackerstaff, K, Alexander, Gideon, Allison, J, Anderson, K J, Anderson, S, ...
Cross-sections and angular distributions for hadronic and lepton pair final states in e+e- collisions at a centre-of-mass energy near 189 GeV, measured with the OPAL detector at LEP, are presented...
Search for Neutral Higgs Bosons in $e^{+}e^{-}$ Collisions at $\sqrt{s} \sim$ 189 GeV (1999)
Abbiendi, G, Ackerstaff, K, Alexander, Gideon, Allison, J, Anderson, K J, Anderson, S, ...
A search for neutral Higgs bosons has been performed with the OPAL detector at LEP, using approximately 170 pb-1 of e+e- collision data collected at sqrt(s)~189GeV. Searches have been performed for...
Abbiendi, G, Ackerstaff, K, Alexander, Gideon, Allison, J, Anderson, K J, Anderson, S, ...
The rate of secondary charm-quark-pair production has been measured in 4.4 million hadronic Z0 decays collected by OPAL. By selecting events with three jets and tagging charmed hadrons in the gluon...
Multi-photon production in $e^{+}e^{-}$ collisions at $\sqrt{s}$ = 189 GeV (1999)
Abbiendi, G, Ackerstaff, K, Alexander, Gideon, Allison, J, Anderson, K J, Anderson, S, ...
The process e+e- to 2 (or 3) gammas is studied using data recorded with the OPAL detector at LEP. The data sample taken at a centre-of-mass energy of 189 GeV corresponds to a total integrated...
A study of $B^{0}_{s}$ meson oscillation using hadronic $Z^{0}$ decays containing leptons (1999)
Abbiendi, G, Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, ...
A sample of Z decays containing b-flavoured hadrons is tagged using leptons, and events having precise proper time measurements are selected. These events are used to study Bs oscillations. using the...
Abbiendi, G, Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, ...
A search is described for the generic process e+e- to X Y, where X is a neutral heavy scalar boson decaying into a pair of photons, and Y is a neutral heavy boson (scalar or vector) decaying into a...
Abbiendi, G, Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, ...
The helicity density matrix elements rho[00] of rho(770)+- and omega(782) mesons produced in Z decays have been measured using the OPAL detector at LEP. Over the measured meson energy range, the...
Measurements of inclusive semileptonic branching fractions of b hadrons in $Z^{0}$ decays (1999)
Abbiendi, G, Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, ...
A measurement of inclusive semileptonic branching fractions of b hadrons produced in Z decays is presented. An enriched Z -> bbbar sample is obtained with a lifetime flavour-tagging technique. The...
Total Hadronic Cross-Section of Photon-Photon Interactions at LEP (1999)
Abbiendi, G, Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, ...
The total hadronic cross-section sigma_gg(W) for the interaction of real photons, gg->hadrons, is measured for gg centre-of-mass energies 10 e+e- hardrons, using a luminosity function for the photon...
Search for R-Parity Violating Decays of Scalar Fermions at LEP (1999)
Abbiendi, G, Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, ...
A search for pair produced scalar fermions with couplings that violate R-parity has been performed using a data sample corresponding to an integrated luminosity of 56 pb-1 at a centre-of-mass energy...
Abbiendi, G, Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, ...
We present a test of the flavour independence of the strong coupling constant for charm and bottom quarks with respect to light (uds) quarks, based on a hadronic event sample obtained with the OPAL...
Search for Scalar Top and Scalar Bottom Quarks at $\sqrt{s}$ = 189 GeV at LEP (1999)
Abbiendi, G, Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, ...
Searches for a scalar top quark and a scalar bottom quark have been performed using a data sample of 182 pb-1 at a centre-of-mass energy of 189 GeV collected with the OPAL detector at LEP. No...
Experimental properties of gluon and quark jets from a point source (1999)
Abbiendi, G, Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, ...
Gluon jets are identified in hadronic Z0 decays as all the particles in a hemisphere opposite to a hemisphere containing two tagged quark jets. Gluon jets defined in this manner are equivalent to...
Intermittency and correlations in hadronic $Z^0$ decays (1999)
Abbiendi, G, Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, ...
A multidimensional study of local multiplicity fluctuations and multiparticle correlations of hadrons produced in Z decays is performed. The study is based on the data sample of more than 4 million...
Measurements of the QED Structure of the Photon (1999)
Abbiendi, G, Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, ...
The structure of both quasi-real and highly virtual photons is investigated using the reaction e+e- -> e+e-mu+mu-, proceeding via the exchange of two photons. The results are based on the complete...
Searches for R-Parity Violating Decays of Gauginos at 183 GeV at LEP (1999)
Abbiendi, G, Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, ...
Searches for pair-produced charginos and neutralinos with R-parity violating decays have been performed using a data sample corresponding to an integrated luminosity of 56 pb-1 collected with the...
Measurement of the W Mass and Width in $e^{+}e^{-}$ Collisions at 183 GeV (1999)
Abbiendi, G, Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, ...
Using a data sample of 57 pb-1 recorded at a centre-of-mass energy of 183 GeV with the Opal detector at LEP, 282 W+W- -> qqqq and 300 W+W- -> qqlnu candidate events are used to obtain a measurement...
Colour reconnection studies in $e^{+}e^{-} \to W^{+}W^{-}$ at $\sqrt{s}$=183 GeV (1999)
Abbiendi, G, Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, ...
The predicted effects of final state interactions such as colour reconnection are investigated by measuring properties of hadronic decays of W bosons, recorded at a centre-of-mass energy of...
Abbiendi, G, Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, ...
The lifetimes of the B+ and B0 mesons, and their ratio, have been measured in the OPAL experiment using 2.4 million hadronic Z0 decays recorded at LEP. Z0 -> b bbar decays were tagged using displaced...
Search for Baryon and Lepton Number Violating $Z^0$ Decays (1999)
Abbiendi, G, Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, ...
Using data collected with the OPAL detector at LEP, we have searched for the processes e+e- -> Z0 -> p e-, p mu- and the charge conjugate final-states. These would violate the conservation of the...
Abbiendi, G, Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, ...
The product branching ratio, f(b->Lambda_b).BR(Lambda_b->Lambda X), where Lambda_b denotes any weakly-decaying b-baryon, has been measured using the OPAL detector at LEP. Lambda_b are selected by the...
A measurement of the $\tau^{-} \to e^{-} \overline{\nu}_{e}\nu_{\tau}$ branching ratio (1998)
Abbiendi, G, Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, ...
The branching ratio for the decay tau->e nue nutau has been measured using Z0 decay data collected by the OPAL experiment at LEP. In total 33073 tau->e nue nutau candidates were identified from a...
$W^{+}W^{-}$ production and triple gauge boson couplings at LEP energies up to 183 GeV (1998)
Abbiendi, G, Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, ...
A study of W-pair production in e+e- annihilations at Lep2 is presented, based on 877 W+W- candidates corresponding to an integrated luminosity of 57 pb-1 at sqrt(s) = 183 GeV. Assuming that the...
Search for Higgs Bosons in $e^{+} e^{-}$ Collisions at 183 GeV (1998)
Abbiendi, G, Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, ...
The data collected by the OPAL experiment at sqrts=183 GeV were used to search for Higgs bosons which are predicted by the Standard Model and various extensions, such as general models with two Higgs...
Bose-Einstein Correlations in $e^{+} e^{-} \to W^{+}W^{-}$ at 172 and 183 GeV (1998)
Abbiendi, G, Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, ...
Bose-Einstein correlations between like-charge pions are studied in hadronic final states produced by e+e- annihilations at center-of-mass energies of 172 and 183 GeV. Three event samples are...
A Measurement of $R_{b}$ using a Double Tagging Method (1998)
Abbiendi, G, Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, ...
The fraction of Z to bbbar events in hadronic Z decays has been measured by the OPAL experiment using the data collected at LEP between 1992 and 1995. The Z to bbbar decays were tagged using...
Abbiendi, G, Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, ...
Photonic events with large missing energy have been observed in e+e- collisions at centre-of-mass energies of 130, 136 and 183 GeV collected in 1997 using the OPAL detector at LEP. Results are...
Abbiendi, G, Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, ...
The inclusive charm hadron semileptonic branching fractions B(c to e) and B(c to mu) in Z to ccbar events have been determined using 4.4 million hadronic Z decays collected with the OPAL detector at...
Search for Chargino and Neutralino Production at $\sqrt{s}$ = 181-184 GeV at LEP (1998)
Abbiendi, G, Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, ...
A search for charginos and neutralinos, predicted by supersymmetric theories, has been performed using a data sample of 57 pb-1 at centre-of-mass energies of 181-184 GeV taken with the OPAL detector...
Abbiendi, G, Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, ...
In the process e+e- to hadrons, one of the effects of gluon emission is to modify the 1+cos(theta)**2 form of the angular distribution of the thrust axis, an effect which may be quantified by the...
Abbiendi, G, Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, ...
A selection of di-lepton events with significant missing transverse momentum has been performed using a total data sample of 77.0 pb-1 at e+e- centre-of-mass energies of 161 GeV, 172 GeV and 183 GeV....
Abbiendi, G, Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, ...
The correlated production of Lambda and Lambdabar baryons has been studied using 4.3 million multihadronic Zo decays recorded with the OPAL detector at LEP. Di-lambda pairs were investigated in the...
First measurement of $Z/\gamma^{*}$ production in Compton scattering of quasi-real photons (1998)
Abbiendi, G, Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, ...
We report the first observation of Z/gamma* production in Compton scattering of quasi-real photons. This is a subprocess of the reaction e+e- to e+e-Z/gamma*, where one of the final state electrons...
Di-Jet Production in Photon-Photon Collisions at $\sqrt{s}_{ee}$ = 161 and 172 GeV (1998)
Abbiendi, G, Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, ...
Di-jet production is studied in collisions of quasi-real photons radiated by the LEP beams at e+e- centre-of-mass energies 161 and 172 GeV. The jets are reconstructed using a cone jet finding...
Abbiendi, G, Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, ...
Cross-sections for hadronic, b-bbar and lepton pair final states in e+e- collisions at sqrt(s) = 183 GeV, measured with the OPAL detector at LEP, are presented and compared with the predictions of...
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, Anderson, S, ...
The spectral functions of the vector current and the axial-vector current have been measured in hadronic tau decays using the OPAL detector at LEP. Within the framework of the Operator Product...
Measurement of the Michel Parameters in Leptonic Tau Decays (1998)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, Anderson, S, ...
The Michel parameters of the leptonic tau decays are measured using the OPAL detector at LEP. The Michel parameters are extracted from the energy spectra of the charged decay leptons and from their...
Search for Higgs bosons and new particles decaying into two photons at $\sqrt{s}$ = 183 GeV (1998)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, Anderson, S, ...
A search for the resonant production of high mass photon pairs associated with a leptonic or hadronic system has been performed using a data sample of 57.7 pb-1 collected at an average center-of-mass...
Multi-photon production in $e^{+}e^{-}$ collisions at $\sqrt{s}$= 183 GeV (1998)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, Anderson, S, ...
The process e+e- to gamma gamma (gamma) is studied using data recorded with the OPAL detector at LEP. The data sample corresponds to a total integrated luminosity of 56.2 pb-1 taken at a...
Inclusive production of charged hadrons and $K_{s}^{0}$ mesons in photon-photon collisions (1998)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, Anderson, S, ...
The production of charged hadrons and K_s mesons in the collisions of quasi-real photons has been measured using the OPAL detector at LEP. The data were taken at e+e- centre-of-mass energies of 161...
Measurement of the average polarization of b baryons in hadronic $Z^0$ decays (1998)
Abbiendi, G, Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, ...
In the Standard Model, b quarks produced in e^+e^- annihilation at the Z^0 peak have a large average longitudinal polarization of -0.94. Some fraction of this polarization is expected to be...
Measurement of Tau Branching Ratios to Five Charged Hadrons (1998)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, Anderson, S, ...
The branching ratios of the decay of the tau lepton to five charged hadrons have been measured with the OPAL detector at LEP using data collected between 1991 and 1995 at e+e- centre-of-mass energies...
Measurements of flavour dependent fragmentation functions in $Z^{0} \to q\overline{q}$ events (1998)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, Anderson, S, ...
Fragmentation functions for charged particles in Z -> qq(bar) events have been measured for bottom (b), charm (c) and light (uds) quarks as well as for all flavours together. The results are based on...
Bose-Einstein correlations of three charged pions in hadronic $Z^{0}$ decays (1998)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, Anderson, S, ...
Bose-Einstein Correlations (BEC) of three identical charged pions were studied in 4 x 10^6 hadronic Z^0 decays recorded with the OPAL detector at LEP. The genuine three-pion correlations, corrected...
An upper limit for the $\tau$-neutrino mass from $\tau \to 5\pi^{\pm} \nu_{\tau}$ decays (1998)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, Anderson, S, ...
An upper limit for the tau-neutrino mass has been determined from the decay tau -> 5pi+- \nu_tau using data collected with the OPAL detector from 1991 to 1995 in e+e- collisions at \sqrt{s} ~ M_Z. A...
Photon and light meson production in hadronic $Z^{0}$ decays (1998)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, Anderson, S, ...
The inclusive production rates and differential cross-sections of photons and mesons with a final state containing photons have been measured with the OPAL detector at LEP. The light mesons covered...
Production of $K^{0}_{S}$ and $\Lambda$ in Quark and Gluon Jets from $Z^{0}$ Decay (1998)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, Anderson, S, ...
The production of K^0_S mesons and Lambda baryons in quark and gluon jets has been investigated using two complementary techniques. In the first approach, which provides high statistical accuracy,...
An upper limit on the anomalous magnetic moment of the $\tau$ lepton (1998)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, Anderson, S, ...
Using radiative Z^0 -> \tau^+ \tau^- \gamma events collected with the OPAL detector at LEP at \sqrt{s}=M_Z during 1990-95, a direct study of the electromagnetic current at the \tau\gamma vertex has...
A search for neutral Higgs bosons in the MSSM and models with two scalar field doublets (1998)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, Anderson, S, ...
A search is described for the neutral Higgs bosons h^0 and A^0 predicted by models with two scalar field doublets and, in particular, the Minimal Supersymmetric Standard Model (MSSM). The search in...
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, Anderson, S, ...
A search for stable and long-lived massive particles of electric charge |Q/e| = 1 or 2/3, pair-produced in e+e- collisions at centre-of-mass energies from 130 to 183 GeV, is reported by the OPAL...
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, Anderson, S, ...
Events with four distinct jets from e^+e^- collisions, collected by the OPAL detector at centre-of-mass energies between 130 and 184 GeV, are analysed for a peak in the sum of dijet masses. This...
Production of $f_{0}(980), f_{2}(1270)$ and $\phi(1020)$ in hadronic $Z^{0}$ decay (1998)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, Anderson, S, ...
Inclusive production of the f_0(980), f_2(1270) and \phi(1020) resonances has been studied in a sample of 4.3 million hadronic Z^0 decays from the OPAL experiment at LEP. A coupled channel analysis...
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, Anderson, S, ...
In e^+e^- collisions at centre-of-mass energies around 91 GeV, D^*0 mesons have been reconstructed using data collected with the OPAL detector at LEP. The hadronisation fraction has been measured to...
Measurements of the $B^{0}_s$ and $\Lambda^{0}_b$ lifetimes (1998)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, Anderson, S, ...
This paper presents updated measurements of the lifetimes of the B^0_s meson and the \Lambda_b baryon using 4.4 million hadronic Z^0 decays recorded by the OPAL detector at LEP from 1990 to 1995. A...
Search for charged Higgs bosons in $e^+ e^-$ collisions at $\sqrt{s}$ = 130-172 GeV (1998)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, Anderson, S, ...
A search is described to detect charged Higgs bosons via the process e^+e^- -> H^+H^-, using data collected by the OPAL detector at center-of-mass energies of 130-172 GeV with a total integrated...
Measurement of the one-prong hadronic $\tau$ branching ratios at LEP (1998)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, Anderson, S, ...
The branching ratios of the \tau^- -> h^- \nu_\tau, \tau^- -> h^- \pi^0 1991-1995 data recorded with the OPAL detector at LEP. These branching ratios are measured simultaneously using three selection...
Investigation of CP violation in $B^{0} \to J/\psi K_{s}^{0}$ decays at LEP (1998)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, Anderson, S, ...
An investigation of CP violation was performed using a total of 24 candidates for B^0 -> J/psi K^0_S decay, with a purity of about 60%. These events were selected from 4.4 million hadronic Z^0 decays...
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, Anderson, S, ...
Photonic events with large missing energy have been observed in e+e- collisions at centre-of-mass energies of 130, 136, 161 and 172 GeV using the OPAL detector at LEP. Results are presented based on...
Search for the $B_c$ meson in hadronic $Z^0$ decays (1997)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, Anderson, S, ...
A search for decays of the B_c meson was performed using data collected from 1990-1995 with the OPAL detector on or near the Z peak at LEP. The decay channels B_c^+ -> J/psi pi^+, B_c^+ -> J/psi...
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, Anderson, S, ...
Events containing a pair of charged leptons and significant missing transverse momentum are selected from a data sample corresponding to a total integrated luminosity of 20.6 pb^-1 at centre-of-mass...
Measurement of triple gauge boson couplings from $W^+ W^-$ production at $\sqrt{s}$ = 172 GeV (1997)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, Anderson, S, ...
We present measurements of triple gauge boson coupling parameters using data recorded by the OPAL detector at LEP2 at a centre-of-mass energy of 172 GeV. A total of 120 W-pair candidates has been...
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, Anderson, S, ...
We have searched for unstable neutral and charged heavy leptons, N and L^+/-, and for excited states of neutral and charged leptons, nu*, e*, mu* and tau*, in e^+e^- collisions at centre-of-mass...
Search for a massive diphoton resonance at $\sqrt{s}$ = 91-172 GeV (1997)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, Anderson, S, ...
A search for the resonant production of high mass photon pairs associated with a leptonic or hadronic system has been performed using a total data sample of 25.7 pb^-1 taken at centre-of-mass...
Multi-photon final states in $e^+ e^-$ collisions at $\sqrt{s}$ = 130-172 GeV (1997)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, Anderson, S, ...
The process e^+e^- -> gamma gamma (gamma) is studied using data recorded with the OPAL detector at LEP. The data sample corresponds to a total integrated luminosity of 25.38 pb^{-1} taken at...
Search for the Standard Model Higgs Boson in $e^+ e^-$ Collisions at $\sqrt{s}$ = 161-172 GeV (1997)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, Anderson, S, ...
This paper describes a search for the Standard Model Higgs boson using data from e^+e^- collisions collected at center-of-mass energies of 161, 170 and 172 GeV by the OPAL detector at LEP. The data...
Multiplicity distributions of gluon and quark jets and tests of QCD analytic predictions (1997)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, Anderson, S, ...
Gluon jets are identified in e+e- hadronic annihilation events by tagging two quark jets in the same hemisphere of an event. The gluon jet is defined inclusively as all the particles in the opposite...
A measurement of the $B^{0}_{s}$ lifetime using reconstructed $D^{-}_{s}$ mesons (1997)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, Anderson, S, ...
Measurement of the photon structure function $F_{2}^{\gamma}$ at low x (1997)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, Anderson, S, ...
Deep inelastic electron-photon scattering is studied using e+e- data collected by the OPAL detector at centre-of-mass energies sqrt{s_ee} ~ M_{Z^0}. The photon structure function F_2^gamma(x,Q^2) is...
Polarization and forward-backward asymmetry of $\Lambda$ baryons in hadronic $Z^0$ decays (1997)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, Anderson, S, ...
The longitudinal polarization, the transverse polarization, and the forward-backward asymmetry of Lambda baryons have been measured using a sample of 4.34 million hadronic Z^0 decays collected with...
Measurement of the $Q^2$ evolution of the photon structure function $F^{\gamma}_{2}$ (1997)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, Anderson, S, ...
Spin alignment of leading $K^{*}(892)^{0}$ mesons in hadronic $Z^0$ decays (1997)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, Anderson, S, ...
Spin alignment of leading $K^{*}(892)^{0}$ mesons in hadronic $Z^0$ decays (1997)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, Anderson, S, ...
Search for chargino and neutralino production at $\sqrt{s}$ = 170 and 172 GeV at LEP (1997)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, Anderson, S, ...
A search for charginos and neutralinos, predicted by supersymmetric theories, has been performed using a data sample of 10.3 pb^-1 at centre-of-mass energies of sqrt(s) = 170 and 172 GeV with the...
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, Anderson, S, ...
Using approximately 4.3 million hadronic Z^0 decays collected with the OPAL detector at LEP between 1990 and 1995, we measure the branching fractions of the Z^0 into up-type and down-type light...
An updated study of B meson oscillations using dilepton events (1997)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, Anderson, S, ...
This paper reports a study of B meson oscillations using hadronic Z^0 decays with two identified leptons, and updates a previous publication by including data collected in 1994. Decay times are...
An upper limit on the branching ratio for $\tau$ decays into seven charged particles (1997)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, Anderson, S, ...
We have searched for decays of the tau lepton into seven or more charged particles, using data collected with the OPAL detector from 1990 to 1995 in e^+e^- collisions at sqrt(s) ~ M_Z. No candidate...
Production of P-wave charm and charm-strange mesons in hadronic $Z^0$ decays (1997)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, Anderson, S, ...
A study of B meson oscillations using hadronic $Z^0$ decays containing leptons (1997)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Anderson, K J, Anderson, S, ...
An event sample enriched in semileptonic decays of b hadrons is selected using an inclusive lepton selection from approximately 3.0 million hadronic Z^0 decays collected with the OPAL detector. This...
QCD studies with $e^+ e^-$ annihilation data at 161 GeV (1997)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, ...
Study of $\phi$(1020), $D^{*\pm}$ and $B^*$ spin alignment in hadronic $Z^0$ decays (1997)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, ...
B$^*$ production in $Z^0$ decays (1997)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, ...
Search for charged scalar leptons using the OPAL detector at $\sqrt{s}$ = 161 GeV at LEP (1997)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, ...
Measurement of the Semileptonic Branching Fraction of Inclusive b Baryon Decays to $\Lambda$ (1996)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, ...
An Improved Measurement of $R_b$ Using a Double Tagging Method (1996)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, ...
Search for the Standard Model Higgs Boson in $e^+ e^-$ Collisions at $\sqrt{s}$ = 161 GeV (1996)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, ...
A Measurement of |$V_{cb}$| Using $\overline{B}^0 \to D^{*+}l^- \overline{\nu}_l$ Decays (1996)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, ...
Photonic Events with Large Missing Energy in $e^+ e^-$ Collisions at $\sqrt{s}$ = 161 GeV (1996)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, ...
Production of Fermion-pair Events in $e^+ e^-$ Collisions at 161 GeV Centre-of-mass Energy (1996)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, ...
Measurement of the mass of the W boson in $e^+ e^-$ collisions at $\sqrt{s}$ = 161 GeV (1996)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, ...
A measurement of the average bottom hadron lifetime (1996)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, ...
Search for excited leptons in $e^+ e^-$ collisions at $\sqrt{s}$ = 161 GeV (1996)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, ...
Inclusive jet production in photon-photon collisions at $\sqrt{s}_{ee}$ = 130 and 136 GeV (1996)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, ...
Search for scalar top and scalar bottom quarks using the OPAL detector at LEP (1996)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, ...
Search for chargino and neutralino production in $e^+ e^-$ collisions at $\sqrt{s}$ = 161 GeV (1996)
Ackerstaff, K, Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, ...
Recommendations for the use of fieldbuses at CERN (1996)
Baribaud, Guy, Barillère, R, Bland, A, Brahy, D, Burckhart, Helfried J, Brun, R, ...
Throughout the LHC project fieldbuses will be required to connect and control equipment and devices of various types. It will be necessary to integrate both industrial equipment and custom designed...
Search for neutral Higgs bosons in $Z^0$ decays using the OPAL detector at LEP (1996)
Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, Anderson, S, ...
Test of QCD analytic predictions for the multiplicity ratio between gluon and quark jets (1996)
Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, Anderson, S, ...
Strange baryon production in hadronic $Z^ 0$ decays (1996)
Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, Anderson, S, ...
$\Sigma^{+}$, $\Sigma^{0}$ and $\Sigma^{-}$ hyperon production in hadronic $Z^{0}$ decays (1996)
Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, Anderson, S, ...
Multiplicity dependence of Bose-Einstein correlations in hadronic $Z^0$ decays (1996)
Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, Anderson, S, ...
A measurement of the charm and bottom forward-backward asymmetries using D mesons at LEP (1996)
Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, Anderson, S, ...
Test of the four-fermion contact interaction in $e^+ e^-$ collisions at 130-140 GeV (1996)
Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, Anderson, S, ...
A precise measurement of the tau polarization and its forward-backward asymmetry at LEP (1996)
Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, Anderson, S, ...
Search for excited leptons in $e^+ e^-$ collisions at $\sqrt{s}$ = 130 and 136 GeV (1996)
Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, Anderson, S, ...
A measurement of the B$_{d}^{0}$ oscillation frequency using leptons and D$*^{\pm}$ mesons (1996)
Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, Anderson, S, ...
Prompt $J/\psi$ Production in Hadronic $Z^{0}$ Decays (1996)
Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, Anderson, S, ...
Upper limit on the $\nu_{\tau}$ mass from $\tau$ --> 3h$\nu_{\tau}$ decays (1996)
Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, Anderson, S, ...
QCD studies with e+e- annihilation data at 130 and 136 GeV (1996)
Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, Anderson, S, ...
A study of four-fermion final states with high multiplicity at LEP (1996)
Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, Anderson, S, ...
Improved measurement of the lifetime of the $\tau$ lepton (1996)
Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, Anderson, S, ...
Topological search for the production of neutralinos and scalar particles (1996)
Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, Anderson, S, ...
Search for a Narrow Resonance in $Z^{0}$ Decays into Hadrons and Isolated Photons (1996)
Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, Anderson, S, ...
Search for charged Higgs bosons using the OPAL detector at LEP (1995)
Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, Anderson, S, ...
Observation of $\Upsilon$ production in hadronic Z$^{0}$ decays (1995)
Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, Anderson, S, ...
Measurement of the $\tau^{-}$ --> e$^{-}\overline{\nu}_{e}\nu_{. tau.}$ (1995)
Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, Anderson, S, ...
$J/\psi$ and $\psi '$ Production in Hadronic $Z^{0}$ Decays (1995)
Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, Anderson, S, ...
Test of the exponential decay law at short decay times using $\tau$ leptons (1995)
Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, Anderson, S, ...
A study of b quark fragmentation into B$^{0}$ and B$^{+}$ mesons at LEP (1995)
Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, Anderson, S, ...
A comparison of b and uds quark jets to gluon jets (1995)
Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, Anderson, S, ...
$\Delta^{++}$ Production in Hadronic $Z^{0}$ Decays (1995)
Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, Anderson, S, ...
Investigation of the string effect using final state photons (1995)
Akers, R J, Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, ...
Measurement of the longitudinal, transverse and asymmetry fragmentation functions at LEP (1995)
Akers, R J, Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, ...
Measurement of the multiplicity of charm quark pairs from gluons in hadronic Z$^{0}$ decays (1995)
Akers, R J, Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, ...
A model independent measurement of quark and gluon jet properties and differences (1995)
Akers, R J, Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, ...
A measurement of the $\Lambda_{b}^{0}$ lifetime (1995)
Akers, R J, Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, ...
A search for lepton flavour violating Z$^{0}$ decays (1995)
Akers, R J, Alexander, Gideon, Allison, J, Altekamp, N, Ametewee, K A, Anderson, K J, ...
Inclusive Strange Vector and Tensor Meson Production in Hadronic $Z^{0}$ Decays (1995)
Akers, R J, Alexander, Gideon, Allison, J, Ametewee, K A, Anderson, K J, Arcelli, S, ...
The production of neutral kaons in Z$^{0}$ decays and their Bose-Einstein correlations (1995)
Akers, R J, Alexander, Gideon, Allison, J, Ametewee, K A, Anderson, K J, Arcelli, S, ...
Measurement of the Hadronic Decay Current in $\tau^{-} \to \pi^{-}\pi^{-}\pi^{+}\nu_{\tau}$ (1995)
Akers, R J, Alexander, Gideon, Allison, J, Ametewee, K A, Anderson, K J, Arcelli, S, ...
Improved measurements of the B$^{0}$ and B$^{+}$ meson lifetimes (1995)
Akers, R J, Alexander, Gideon, Allison, J, Ametewee, K A, Anderson, K J, Arcelli, S, ...
An improved measurement of the B$_{s}^{0}$ lifetime (1995)
Akers, R J, Alexander, Gideon, Allison, J, Ametewee, K A, Anderson, K J, Arcelli, S, ...
A study of B meson oscillations using dilepton events (1995)
Akers, R J, Alexander, Gideon, Allison, J, Ametewee, K A, Anderson, K J, Arcelli, S, ...
Measurement of the leptonic branching ratios of the $\tau$ lepton (1995)
Akers, R J, Alexander, Gideon, Allison, J, Ametewee, K A, Anderson, K J, Arcelli, S, ...
A study of charm meson production in semileptonic B decays (1995)
Akers, R J, Alexander, Gideon, Allison, J, Ametewee, K A, Anderson, K J, Arcelli, S, ...
A Measurement of the Production of $D*^{\pm}$ Mesons on the $Z^{0}$ Resonance (1995)
Akers, R J, Alexander, Gideon, Allison, J, Ametewee, K A, Anderson, K J, Arcelli, S, ...
Observations of $\pi$-B charge-flavor correlations and resonant B$\pi$ and BK production (1994)
Akers, R J, Alexander, Gideon, Allison, J, Ametewee, K A, Anderson, K J, Arcelli, S, ...
A Test of $CP$ Invariance in $Z^{0} \to \tau^{+}\tau^{-}$ using Optimal Observables (1994)
Akers, R J, Alexander, Gideon, Allison, J, Ametewee, K A, Anderson, K J, Arcelli, S, ...
Updated measurement of the $\tau$ lifetime (1994)
Akers, R J, Alexander, Gideon, Allison, J, Anderson, K J, Arcelli, S, Asai, S, ...
Measurement of Single-Photon Production in $e^{+}e^{-}$ Collisions near the $Z^{0}$ Resonance (1994)
Akers, R J, Alexander, Gideon, Allison, J, Anderson, K J, Arcelli, S, Asai, S, ...
Determination of an upper limit for the mass of the $\tau$-neutrino at LEP (1994)
Akers, R J, Alexander, Gideon, Allison, J, Anderson, K J, Arcelli, S, Asai, S, ...
Search for neutral Higgs bosons in the minimal supersymmetric extension of the Standard Model (1994)
Akers, R J, Alexander, Gideon, Allison, J, Anderson, K J, Arcelli, S, Asai, S, ...
Search for a scalar top quark using the OPAL detector (1994)
Akers, R J, Alexander, Gideon, Allison, J, Anderson, K J, Arcelli, S, Asai, S, ...
Search for rare hadronic B decays (1994)
Akers, R J, Alexander, Gideon, Allison, J, Anderson, K J, Arcelli, S, Asai, S, ...
Observation of exclusive decays of B mesons at LEP (1994)
Akers, R J, Alexander, Gideon, Allison, J, Anderson, K J, Arcelli, S, Asai, S, ...
QCD studies using a cone-based jet finding algorithm for e+e- collisions at LEP (1994)
Akers, R J, Alexander, Gideon, Allison, J, Anderson, K J, Arcelli, S, Astbury, Alan, ...
A Study of Mean Subjet Multiplicities in Two- and Three-Jet Hadronic $Z^{0}$ Decays (1994)
Akers, R J, Alexander, Gideon, Allison, J, Anderson, K J, Arcelli, S, Astbury, Alan, ...
Search for the minimal Standard Model Higgs boson (1994)
Akers, R J, Alexander, Gideon, Allison, J, Anderson, K J, Arcelli, S, Astbury, Alan, ...
Measurement of the $\tau$ lifetime (1994)
Acton, P D, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Arcelli, S, ...
Studies of charged particle multiplicity in b quark events (1993)
Akers, R J, Alexander, Gideon, Allison, J, Anderson, K J, Arcelli, S, Astbury, Alan, ...
The data acquisition system of the OPAL detector at LEP (1993)
Baines, J T M, Beck, F, Burckhart, Helfried J, Charlton, D G, Cranfield, R, Crone, G J, ...
A measurement of the average lifetime of b-flavoured baryons (1993)
Akers, R J, Alexander, Gideon, Allison, J, Anderson, K J, Arcelli, S, Astbury, Alan, ...
Improved measurements of the neutral current from hadron and lepton production at LEP (1993)
Akers, R J, Alexander, Gideon, Allison, J, Anderson, K J, Arcelli, S, Astbury, Alan, ...
A test of the flavour independence of the strong interaction for five flavours (1993)
Akers, R J, Alexander, Gideon, Allison, J, Anderson, K J, Arcelli, S, Astbury, Alan, ...
Measurement of the B$^{0}_{s}$ lifetime (1993)
Acton, P D, Akers, R J, Alexander, Gideon, Allison, J, Anderson, K J, Arcelli, S, ...
Measurement of the Average $b$-Hadron Lifetime in $Z^{0}$ Decays (1993)
Acton, P D, Akers, R J, Alexander, Gideon, Allison, J, Anderson, K J, Arcelli, S, ...
Search for massive, unstable photinos that violate R parity (1993)
Acton, P D, Akers, R J, Alexander, Gideon, Allison, J, Anderson, K J, Arcelli, S, ...
Search for anomalous production of high mass photon pairs in e+e- collisions at LEP (1993)
Acton, P D, Akers, R J, Alexander, Gideon, Allison, J, Anderson, K J, Arcelli, S, ...
A Determination of $\ alpha_{s}(M_{Z0})$ at LEP using Resummed QCD Calculations (1993)
Acton, P D, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Arcelli, S, ...
Measurement of $\Gamma (Z^{0} \to b\overline{b}) / \Gamma (Z^{0} \to$ Hadrons) using Leptons (1993)
Acton, P D, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Arcelli, S, ...
Measurement of the B$^{0}$ and B$^{+}$ lifetimes (1993)
Acton, P D, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Arcelli, S, ...
Evidence for chain-like production of strange baryon pairs in jets (1993)
Acton, P D, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Arcelli, S, ...
A study of differences between quark and gluon jets using vertex tagging of quark jets (1993)
Acton, P D, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Arcelli, S, ...
Precision measurements of the neutral current from hadron and lepton production at LEP (1993)
Acton, P D, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Arcelli, S, ...
A study of the electric charge distributions of quark and gluon jets in hadronic Z0 decays (1993)
Acton, P D, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Arcelli, S, ...
A measurement of K$*$(892)$^{\pm}$ production in hadronic Z0 decays (1993)
Acton, P D, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Arcelli, S, ...
QCD coherence studies using two particle azimuthal correlations (1993)
Acton, P D, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Arcelli, S, ...
A study of K$^{0}_{s}$K$^{0}_{s}$ Bose-Einstein correlations in hadronic Z0 decays (1992)
Acton, P D, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Arcelli, S, ...
Evidence for the existence of the strange b-flavoured meson B$^{0}_{s}$ in Z$^{0}$ decays (1992)
Acton, P D, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Arcelli, S, ...
A search for doubly-charged Higgs production in Z$^{0}$ decays (1992)
Acton, P D, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Arcelli, S, ...
A measurement of the forward-backward charge asymmetry in hadronic decays of the Z0 (1992)
Acton, P D, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Arcelli, S, ...
A measurement of strange baryon production in hadronic Z0 decays (1992)
Acton, P D, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Arcelli, S, ...
Inclusive neutral vector meson production in hadronic Z0 decays (1992)
Acton, P D, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Arcelli, S, ...
A study of two-particle momentum correlations in hadronic Z0 decays (1992)
Acton, P D, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Arcelli, S, ...
Measurement of the $\tau$ topological branching ratios at LEP (1992)
Acton, P D, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Arcelli, S, ...
Evidence for b-flavoured baryon production in Z0 decays at LEP (1992)
Acton, P D, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Arcelli, S, ...
A global determination of $\alpha_{s}$(M$_{Z0}$) at LEP (1992)
Acton, P D, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Arcelli, S, ...
Search for free gluons in hadronic Z0 decays (1992)
Acton, P D, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Arcelli, S, ...
Measurement of B$^{0}$-$\overline{B}^{0}$ mixing in hadronic Z$^{0}$ decays (1991)
Acton, P D, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Arcelli, S, ...
Measurement of the average B hadron lifetime in Z$^{0}$ decays (1991)
Acton, P D, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Arcelli, S, ...
Properties of multihadronic events with a final state photon at \Sqrt s = M$_{Z0}$ (1991)
Acton, P D, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Arcelli, S, ...
A study of charged particle multiplicities in hadronic decays of the Z0 (1991)
Acton, P D, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Arcelli, S, ...
Measurement of the tau lepton lifetime (1991)
Acton, P D, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Arcelli, S, ...
A measurement of photon radiation in lepton pair events from Z$^{0}$ decays (1991)
Acton, P D, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Arcelli, S, ...
Decay mode independent search for a light Higgs boson and new scalars (1991)
Acton, P D, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Arcelli, S, ...
A study of Bose-Einstein correlations in e+e- annihilations at LEP (1991)
Acton, P D, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Arcelli, S, ...
Observation of J/$\psi$ production in multihadronic Z0 decays (1991)
Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Arcelli, S, Armitage, J C, ...
A direct observation of quark-gluon jet differences at LEP (1991)
Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Arcelli, S, Armitage, J C, ...
A study of K$_{S}^{0}$ production in Z0 decays (1991)
Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Arcelli, S, Armitage, J C, ...
Measurement of the Z0 line shape parameters and the electroweak couplings of charged leptons (1991)
Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Arcelli, S, Armitage, J C, ...
A study of D$*^{\pm}$ production in Z$^{0}$ decays (1991)
Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Arcelli, S, Armitage, J C, ...
A search for scalar leptoquarks in Z$^{0}$ decays (1991)
Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Arcelli, S, Armitage, J C, ...
A study of heavy flavour production using muons in hadronic Z$^{0}$ decays (1991)
Akrawy, M Z, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Armitage, J C, ...
Intermittency in hadronic decays of the Z$^{0}$ (1991)
Akrawy, M Z, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Armitage, J C, ...
A model independent observation of the string effect using quark tagging at LEP (1991)
Akrawy, M Z, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Armitage, J C, ...
A direct measurement of the Z$^{0}$ invisible width by single photon counting (1991)
Akrawy, M Z, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Armitage, J C, ...
Limits on a light Higgs boson in e+e- collisions at LEP (1990)
Akrawy, M Z, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Armitage, J C, ...
Searches for neutral Higgs bosons in e+e- collisions at LEP (1990)
Akrawy, M Z, Alexander, G, Allison, J, Allport, P P, Anderson, K J, Armitage, J C, ...
A direct search for neutralino production at LEP (1990)
Akrawy, M Z, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Armitage, J C, ...
A study of coherence of soft gluons in hadron jets (1990)
Akrawy, M Z, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Armitage, J C, ...
A study of angular correlations in 4-jet final states of hadronic Z0 decays (1990)
Akrawy, M Z, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Armitage, J C, ...
Analysis of Z0 couplings to charged leptons (1990)
Akrawy, M Z, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Armitage, J C, ...
Limits on neutral heavy lepton production from Z0 decay (1990)
Akrawy, M Z, Alexander, G, Allison, J, Allport, P P, Anderson, K J, Armitage, J C, ...
Evidence for final state photons in multihadronic decays of the Z0 (1990)
Akrawy, M Z, Alexander, G, Allison, J, Allport, P P, Anderson, K J, Armitage, J C, ...
Search for excited leptons at LEP (1990)
Akrawy, M Z, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Armitage, J C, ...
A measurement of global event shape distributions in the hadronic decays of the Z0 (1990)
Akrawy, M Z, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Armitage, J C, ...
A search for technipions and charged Higgs bosons at LEP (1990)
Akrawy, M Z, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Armitage, J C, ...
A study of the reaction e$^{+}$e$^{-}$ --> $\gamma\gamma$ at LEP (1990)
Akrawy, M Z, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Armitage, J C, ...
A combined analysis of the hadronic and leptonic decays of the Z0 (1990)
Akrawy, M Z, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Armitage, J C, ...
A direct search for new charged heavy leptons at LEP (1990)
Akrawy, M Z, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Armitage, J C, ...
Measurement of the lifetime of the charmed strange baryon A+ (1990)
Biagi, S F, Bourquin, Maurice, Britten, A J, Brown, R M, Burckhart, Helfried J, Carter, A A, ...
A measurement of the branching ratio SIGMA+ --> p.gamma/SIGMA+ --> p.pi0 (1990)
Biagi, S F, Bourquin, Maurice, Brown, R M, Burckhart, Helfried J, Doré, C, Extermann, Pierre, ...
First measurement of the LAMBDA --> n.gamma branching ratio (1990)
Biagi, S F, Bourquin, Maurice, Brown, R M, Burckhart, Helfried J, Doré, C, Extermann, Pierre, ...
A study of jet production rates and a test of QCD on the Z0 resonance (1990)
Akrawy, M Z, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Armitage, J C, ...
Biagi, S F, Bourquin, Maurice, Brown, R M, Burckhart, Helfried J, Extermann, Pierre, Gailloud, M, ...
First measurement of the (XI- --> SIGMA-gamma) / (XI- --> LAMBDA.pi-) branching ratio (1990)
Biagi, S F, Bourquin, Maurice, Brown, R M, Burckhart, Helfried J, Doré, C, Extermann, Pierre, ...
Particle identification with the OPAL jet chamber in the region of the relativistic rise (1990)
Breuker, Horst, Fischer, H M, Hauschild, M, Hartmann, H, Wünsch, B, Börner, H, ...
Investigation of very long jet chambers (1990)
Burckhart, Helfried J, Vavra, J, Zankel, K, Dudziak, U, Schaile, A D, Schaile, O, ...
Measurement of the Z0 mass and width with the OPAL detector at LEP (1990)
Akrawy, M Z, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Armitage, J C, ...
Measurement of the decay of the Z0 into lepton pairs (1990)
Akrawy, M Z, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Armitage, J C, ...
A search for the top and b' quarks in hadronic Z0 decays (1990)
Akrawy, M Z, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Armitage, J C, ...
Mass limits for a standard model Higgs boson in e+e- collisions at LEP (1990)
Akrawy, M Z, Alexander, Gideon, Allison, J, Allport, P P, Anderson, K J, Armitage, J C, ...
Bourquin, Maurice, Brown, R M, Burckhart, Helfried J, Extermann, Pierre, Gailloud, M, Gibson, W M, ...
The OPAL jet chamber full scale prototype (1990)
Fischer, H M, Hauschild, M, Hartmann, H, Hegerath, A, Börner, H, Burckhart, Helfried J, ...
The control system of the OPAL detector at LEP (1990)
Amundsen, A K, Beard, C, Burckhart, Helfried J, Hammarström, R, Jaffer, S, Meynet, E
Production of hyperons and hyperon resonances in XI-N interactions at 102 and 135 GeV/c (1990)
Biagi, S F, Bourquin, Maurice, Britten, A J, Brown, R M, Burckhart, Helfried J, Carter, A A, ...
Beobachtung eines neuen Teilchenzustandes : ein Kandidat für das charmed strange Baryon A+. (1983)
Heidelberg, Univ., Diss., 1983 (Nicht f.d. Austausch).