Study of b-quark mass effects in multijet topologies with the DELPHI detector at LEP (2008)
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, T, Alemany-Fernandez, R, ...
The effect of the heavy b-quark mass on the two, three and four-jet rates is studied using LEP data collected by the DELPHI experiment at the Z peak in 1994 and 1995. The rates of b-quark jets and...
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, T, Alemany-Fernandez, R, ...
A measurement of the W boson mass and width has been performed by the DELPHI collaboration using the data collected during the full LEP2 programme (1996-2000). The data sample has an integrated...
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, T, Alemany-Fernandez, R, ...
This paper presents the final interpretation of the results from DELPHI on the searches for Higgs bosons in the Minimal Supersymmetric extension of the Standard Model (MSSM). A few representative...
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, T, Alemany-Fernandez, R, ...
This paper presents the final interpretation of the results from DELPHI on the searches for Higgs bosons in the Minimal Supersymmetric extension of the Standard Model (MSSM). A few representative...
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, T, Alemany-Fernandez, R, ...
A determination of the single W Spin Density Matrix (SDM) elements in the reaction e+e- -> W+W- -> l nu q qbar (l=e/mu) is reported at centre-of-mass energies between 189 and 209 GeV. The data sample...
Measurement of the Tau Lepton Polarisation at LEP2 (2007)
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, T, Alemany-Fernandez, R, ...
A first measurement of the average polarisation P_tau of tau leptons produced in e+e- annihilation at energies significantly above the Z resonance is presented. The polarisation is determined from...
Search for Pentaquarks in the Hadronic Decays of the Z Boson with the DELPHI Detector at LEP (2007)
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, T, Alemany-Fernandez, R, ...
The quark model does not exclude states composed of more than three quarks, like pentaquark systems. Controversial evidence for such states has been published in the last years, in particular: for a...
$Z\gamma*$ production in $e^+ e^-$ interactions at $\sqrt{s}$ = 183 - 209 GeV (2007)
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, T, Alemany-Fernandez, R, ...
Measurements of Zgamma* production are presented using data collected by the DELPHI detector at centre-of-mass energies ranging from 183 to 209 GeV, corresponding to an integrated luminosity of about...
Study of Triple-Gauge-Boson Couplings ZZZ, ZZ$\gamma$ and Z$\gamma\gamma$ at LEP (2007)
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, T, Alemany-Fernandez, R, ...
Neutral triple-gauge-boson couplings ZZZ, ZZgam and Zgamgam have been studied with the DELPHI detector using data at energies between 183 and 208 GeV. Limits are derived on these couplings from an...
Investigation of Colour Reconnection in WW Events with the DELPHI detector at LEP-2 (2007)
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, T, Alemany-Fernandez, R, ...
In the reaction e+e- -> WW -> (q_1 qbar_2)(q_3 qbar_4) the usual hadronization models treat the colour singlets q_1 qbar_2 and q_3 qbar_4 coming from two W bosons independently. However, since the...
Search for a fourth generation b'-quark at LEP-II at sqrt{s}=196-209 GeV (2007)
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, T, Alemany-Fernandez, R, ...
A search for the pair production of fourth generation b'-quarks was performed using data taken by the DELPHI detector at LEP-II. The analysed data were collected at centre-of-mass energies ranging...
Search for Charged Higgs bosons in $e^{+}e{-}$ collisions at $\sqrt{s}$ =183-202 GeV$ (2007)
Battaglia, M, Ellert, M, Ekelöf, T J C, Gómez-Ceballos, G, Kiistinen, A, Lutz, P, ...
Search for Charged Higgs bosons in $e^{+}e^{-}$ collisions at LEP (2006)
Battaglia, M, Ellert, M, Ekelöf, T J C, Gómez-Ceballos, G, Kiiskinen, A P, Lutz, P, ...
First design of a post-collision line for CLIC at 3 TeV (2006)
Ekelöf, T J C, Eliasson, Peder, Ferrari, Alfredo, Ziemann, Volker
As part of the Post-Collision Diagnostic Lattice task of the ILPS work-package of EuroTeV, we discuss a design of the beam line between the interaction point and the beam dump for CLIC with a...
Search for Charged Higgs Bosons in $e^{+}e^{-}$ collisions at $\sqrt{s}$ =189-208 GeV (2006)
Battaglia, M, Ellert, M, Ekelöf, T J C, Gómez-Ceballos, G, Kiiskinen, A P, Lutz, P, ...
b-tagging in DELPHI at LEP (2006)
Abdallah, J, Abreu, P, Adam, W, Adye, T, Adzic, P, Albrecht, T, ...
Search for Charged Higgs Bosons at LEP in general two higgs doublet models (2006)
Battaglia, M, Cuevas-Maestro, J, Ellert, M, Ekelöf, T J C, Gómez-Ceballos, G, Kiiskinen, A P, ...
Final results from DELPHI on the searches for SM and MSSM Neutral Higgs Bosons (2006)
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, T, Alderweireld, T, ...
Search for Charged Higgs Bosons at LEP in General Two Higgs Doublet Models (2006)
Battaglia, M, Ellert, M, Ekelöf, T J C, Gómez-Ceballos, G, Kiiskinen, A P, Lutz, P, ...
ZZ production in $e^{+}e^{-}$ interactions at $\sqrts$=183-209 GeV (2006)
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, T, Alderweireld, T, ...
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, T, Alderweireld, T, ...
Determination of Afb at the Z pole using inclusive charge reconstruction and lifetime tagging (2006)
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, Z, Alderweireld, T, ...
Search for Charged Higgs Bosons at LEP in General Two Higgs Doublet Models (2006)
Battaglia, M, Ellert, M, Ellert, T, Ekelöf, T J C, Gómez-Ceballos, G, Kiiskinen, A P, ...
Searches for Neutral Higgs Bosons in Extended Models (2006)
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, T, Alderweireld, T, ...
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, T, Alderweireld, T, ...
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, T, Alderweireld, T, ...
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, T, Alderweireld, T, ...
$Zgam^*$ production in $^{+} e^{-}$ interactions at $\sqrt {s} = 183 - 209$ GeV (2006)
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, T, Alderweireld, T, ...
Study of Leading Hadrons in Gluon and Quark Fragmentation (2006)
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, T, Alderweireld, T, ...
The study of quark jets in e+e- reactions at LEP has demonstrated that the hadronisation process is reproduced well by the Lund string model. However, our understanding of gluon fragmentation is less...
Study of Triple-Gauge-Boson Couplings ZZZ , ZZgam and Zgamgam at LEP (2006)
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, T, Alderweireld, T, ...
Search for excited leptons in $e^{+}e^{-}$ collisions at $\sqrts=189 - 209$ GeV (2006)
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, T, Alderweireld, T, ...
Bose-Einstein Correlations in $W^{+}W^{-}$ events at LEP2 (2006)
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, Z, Alderweireld, T, ...
Masses, lifetimes and production rates of $\Xi-$ and $anti\Xi+$ at LEP 1 (2006)
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, T, Alderweireld, T, ...
Measurements of the Xi- and anti-Xi+ masses, mass differences, lifetimes and lifetime differences are presented. The anti-Xi+ sample used is much larger than those used previously for such...
Evidence for an excess of soft photons in hadronic decays of $Z^{0}$ (2006)
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, T, Alderweireld, T, ...
Soft photons inside hadronic jets converted in front of the DELPHI main tracker (TPC) in events of qqbar disintegrations of the Z^0 were studied in the kinematic range 0.2 < E_gamma < 1 GeV and...
A Measurement of the Tau Hadronic Branching Ratios (2006)
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, T, Alderweireld, T, ...
The exclusive and semi-exclusive branching ratios of the tau lepton hadronic decay modes (h- v_t, h- pi0 v_t, h- pi0 pi0 v_t, h- \geq 2pi0 v_t, h- \geq 3pi0 v_t, 2h- h+ v_t, 2h- h+ pi0 v_t, 2h- h+...
Search for excited leptons in $e^{+}e^{-}$ collisions at $\sqrt{s}=189-209 GeV$ (2006)
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, T, Alderweireld, T, ...
A search for excited lepton production in e+e- collisions was performed using the data collected by the DELPHI detector at LEP at centre-of-mass energies ranging from 189 GeV to 209 GeV,...
Determination of the b quark mass at the $M_Z$ scale with the DELPHI detector at LEP (2006)
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, T, Alderweireld, T, ...
An experimental study of the normalized three-jet rate of b quark events with respect to light quarks events (light= \ell \equiv u,d,s) has been performed using the CAMBRIDGE and DURHAM jet...
Search for neutral MSSM Higgs bosons at LEP (2006)
Schael, S, Barate, R, Brunelière, R, De Bonis, I, Décamp, D, Goy, C, ...
The four LEP collaborations, ALEPH, DELPHI, L3 and OPAL, have searched for the neutral Higgs bosons which are predicted by the Minimal Supersymmetric Standard Model (MSSM). The data of the four...
Study of double-tagged $\gamma\gamma$ events at LEP2 (2006)
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, T, Alderweireld, T, ...
Double-tagged interactions of photons with virtualities Q^2 between 10GeV^2 and 200GeV^2 are studied with the data collected by DELPHI at LEP2 from 1998 to 2000, corresponding to an integrated...
A determination of the centre-of-mass energy at LEP2 using radiative two-fermion events (2006)
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, T, Alderweireld, T, ...
Using e+e- -> mu+mu-(gamma) and e+e- -> qqbar(gamma) events radiative to the Z pole, DELPHI has determined the centre-of-mass energy, sqrt{s}, using energy and momentum constraint methods. The...
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, T, Alderweireld, T, ...
The production of single charged and neutral intermediate vector bosons in e+e- collisions has been studied in the data collected by the DELPHI experiment at LEP at centre-of-mass energies between...
Search for $\eta_b$ in two-photon collisions at LEP II with the DELPHI detector (2006)
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, T, Alderweireld, T, ...
The pseudoscalar meson \eta_b has been searched for in two-photon interactions at LEP II. The data sample corresponds to a total integrated luminosity of 617 pb^-1 at centre-of-mass energies ranging...
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, T, Alderweireld, T, ...
This paper presents DELPHI measurements and interpretations of cross-sections, forward-backward asymmetries, and angular distributions, for the e+e- -> ffbar process for centre-of-mass energies above...
Flavour Independent Searches for Hadronically Decaying Neutral Higgs Bosons (2005)
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, T, Alderweireld, T, ...
This paper describes flavour independent searches for hadronically decaying neutral Higgs bosons in the data collected by the DELPHI experiment at LEP, at centre-of-mass energies between 189 and 209...
Charged-particle multiplicity in three-jet events and two-gluon systems (2005)
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, T, Alderweireld, T, ...
The charged particle multiplicity in hadronic three-jet events from Z decays is investigated. The topology dependence of the event multiplicity is found to be well described by a modified leading...
Production of $\Xi_{c}^{0}$ and $\Xi_{b}$ in Z decays and lifetime measurement of $\Xi_{b}$ (2005)
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, T, Alderweireld, T, ...
The charmed strange baryon Xi_c^0 was searched for in the decay channel Xi_c^0 -> Xi- pi+, and the beauty strange baryon Xi_b in the inclusive channel Xi_b -> Xi- l- anti-nu X, using the 3.5 million...
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, T, Alderweireld, T, ...
Moments of the hadronic invariant mass and of the lepton energy spectra in semileptonic B decays have been determined with the data recorded by the DELPHI detector at LEP. From measurements of the...
Precision Electroweak Measurements on the Z Resonance (2005)
Schael, S, Barate, R, Brunelière, R, Buskulic, Damir, De Bonis, I, Décamp, D, ...
We report on the final electroweak measurements performed with data taken at the Z resonance by the experiments operating at the electron-positron colliders SLC and LEP. The data consist of 17...
The Cerenkov ring-imaging detector: recent progress and future development (2005)
Ekelöf, T J C, Séguinot, Jacques, Tocqueville, J, Ypsilantis, Thomas
Results are reported on measurements of Cerenkov ring images using a multistage MWPC with an argon-TEA gas mixture. A specific detector response of N/sub 0/=56 cm/sup -1/ was obtained. It is shown...
Bose-Einstein correlations in $W^{+}W^{-}$ events at LEP2 (2005)
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, Z, Alderweireld, T, ...
Bose-Einstein correlations (BEC) between final state particles in the reaction e+e- -> W+W- -> q_1 anti-q_2 q_3 anti-q_4 have been studied. Data corresponding to a total integrated luminosity of 550...
Hansen, Christian, Ekelöf, T J C
This thesis is based on work done in two different experimental projects. The first project, the Tau RICH, is a previously proposed tau-neutrino appearance experiment for the CERN neutrino beam at...
Hansen, C, Assamagan, Ketevi A, Ekelöf, T J C, Gollub, N
We have investigated charged Higgs boson production via the gluon-bottom quark mode, gb → tH±, followed by its decay into a chargino and a neutralino. The calculations are based on...
Coherent scattering of $\pi$ mesons from helium at high energies : 4 papers (2004)
[Article I: A measurement of the differential cross section for elastic pion-helium scattering at 7.76 GeV/c] Results are presented for the region of squared four-momentum transfers between −0.05...
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, T, Alderweireld, T, ...
Hadronic events from the data collected with the DELPHI detector at LEP within the energy range from 89 GeV to 209 GeV are selected, their jet rates are determined and compared to predictions of four...
Coherent soft particle production in Z decays into three jets (2004)
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, T, Alderweireld, T, ...
Low-energy particle production perpendicular to the event plane in three-jet events produced in Z decays in e+e- annihilation is measured and compared to that perpendicular to the event axis in...
Searches for Neutral Higgs Bosons in Extended Models (2004)
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, T, Alderweireld, T, ...
Searches for neutral Higgs bosons produced at LEP in association with Z bosons, in pairs and in the Yukawa process are presented in this paper. Higgs boson decays into b quarks, tau leptons, or other...
A Precise Measurement of the Tau Lifetime (2004)
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, T, Alderweireld, T, ...
The tau lepton lifetime has been measured with the e+e- -> tau+tau- events collected by the DELPHI detector at LEP in the years 1991-1995. Three different methods have been exploited, using both...
Determination of the $e^+ e^- \to \gamma \gamma (\gamma)$ cross-section at LEP 2 (2004)
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, T, Alderweireld, T, ...
A test of the benchmark QED process e+e- -> gamma gamma (gamma) is reported, using the data collected with the DELPHI detector at LEP 2. The data analysed were recorded at centre-of-mass energies...
A Step Towards A Computing Grid For The LHC Experiments: ATLAS Data Challenge 1 (2004)
Sturrock, R, Bischof, R, Epp, B, Ghete, V M, Kuhn, D, Mello, A G, ...
The ATLAS Collaboration at CERN is preparing for the data taking and analysis at the LHC that will start in 2007. Therefore, a series of Data Challenges was started in 2002 whose goals are the...
Photon Events with Missing Energy in $e^{+}e^{-}$ Collisions at $\sqrt{s}$ = 130 to 209 GeV (2004)
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, T, Alderweireld, T, ...
The production of single- and multi-photon events has been studied in the reaction e+e- -> gamma (gamma) + invisible particles. The data collected with the DELPHI detector during the years 1999 and...
Abdallah, J, Abreu, P, Adam, W, Adzic, P, Albrecht, T, Alderweireld, T, ...
Searches for pair-production of supersymmetric particles under the assumption of non-conservation of R-parity with a dominant LLEbar or UbarDbarDbar term have been performed using the data collected...