R. Frühwirth

Publication List Details

Period

1990 - 2009

Number

303

Co-Authors

Performance studies of the CMS Strip Tracker before installation (2009)

Adam, W, Bergauer, T, Dragicevic, M, Friedl, M, Frühwirth, R, Hansel, S, ...

In March 2007 the assembly of the Silicon Strip Tracker was completed at the Tracker Integration Facility at CERN. Nearly 15% of the detector was instrumented using cables, fiber optics, power...

Track Fitting With Ambiguities and Noise: A Study of Elastic Tracking and Non-Linear Filters (2007)

R. Frühwirth, A. Strandlie

this paper, however, we will assume that a separate pattern recognition procedure has been applied first. We therefore intend to use the EAA to obtain the final fit of the tracks, and the pattern...

The CMS High Level Trigger (2006)

Adam, W, Bergauer, T, Deldicque, C, Ero, J, Frühwirth, R, Jeitler, Manfred, ...

At the Large Hadron Collider at CERN the proton bunches cross at a rate of 40MHz. At the Compact Muon Solenoid experiment the original collision rate is reduced by a factor of O (1000) using a...

Reconstruction of electrons with the Gaussian-sum filter in the CMS tracker at the LHC (2005)

Adam, W., Frühwirth, R., Strandlie, A., Todorov, T.

The bremsstrahlung energy loss distribution of electrons propagating in matter is highly non-Gaussian. Because the Kalman filter relies solely on Gaussian probability density functions, it is not...

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...

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...

Track Reconstruction in the CMS Tracker (2005)

Speer, T, Adam, W, Frühwirth, R, Strandlie, A, Todorov, T, Winkler, M

An overview of the track reconstruction algorithms used in the tracker of the CMS experiment at the LHC is presented. At the LHC, track reconstruction will be a very challenging task due to the high...

A Gaussian-Sum Filter for Vertex Reconstruction (2005)

Frühwirth, R, Speer, T

A vertex reconstruction algorithm was developed based on the Gaussian-sum Filter and implemented in the framework of the CMS reconstruction program. While linear least-square estimators are optimal...

A Gaussian-Sum Filter for Vertex Reconstruction (2004)

Frühwirth, R, Speer, T

A vertex reconstruction algorithm was developed based on the Gaussian-sum filter (GSF) and implemented in the framework of the CMS reconstruction program. While linear least-square estimators are...

Reconstruction of electrons with the Gaussian-sum filter in the CMS tracker at LHC (2003)

Adam, W, Frühwirth, R, Strandlie, A, Todorov, T

The bremsstrahlung energy loss distribution of electrons propagating in matter is highly non Gaussian. Because the Kalman filter relies solely on Gaussian probability density functions, it might not...

Reconstruction of electrons with the Gaussian-sum filter in the CMS tracker at LHC (2003)

Adam, W., Frühwirth, R., Strandlie, A., Todorov, T.

The bremsstrahlung energy loss distribution of electrons propagating in matter is highly non Gaussian. Because the Kalman filter relies solely on Gaussian probability density functions, it might not...

Vertex reconstruction framework and its implementation for CMS (2003)

Boccali, T, Frühwirth, R, Prokofiev, K, Speer, T, Vanlaer, P, Waltenberger, W

The class framework developed for vertex reconstruction in CMS is described. We emphasize how we proceed to develop a flexible, efficient and reliable piece of reconstruction software. We describe...

Vertex reconstruction framework and its implementation for CMS (2003)

Boccali, T, Frühwirth, R, Prokofiev, K, Speer, T, Vanlaer, P, Waltenberger, W

The class framework developed for vertex reconstruction in CMS is described. We emphasize how we proceed to develop a flexible, efficient and reliable piece of reconstruction software. We describe...

Single Intermediate Vector Boson Production in $e^+ e^-$ collisions at $\sqrt{s}$ = 183 and 189 GeV (2001)

Abreu, P, Adam, W, Adye, T, Adzic, P, Ajinenko, I, Albrecht, Z, ...

The cross-sections for the production of single charged and neutral intermediate vector bosons were measured using integrated luminosities of 52~pb$^{-1}$ and 154~pb$^{-1}$ collected by the DELPHI...

Single Intermediate Vector Boson Production in $e^+ e^-$ collisions at $\sqrt{s}$ = 183 and 189 GeV (2001)

Abreu, P, Adam, W, Adye, T, Adzic, P, Ajinenko, I, Albrecht, Z, ...

The cross-sections for the production of single charged and neutral intermediate vector bosons were measured using integrated luminosities of 52~pb$^{-1}$ and 154~pb$^{-1}$ collected by the DELPHI...

A Measurement of the Tau Topological Branching Ratios (2001)

Abreu, P, Adam, W, Adye, T, Adzic, P, Albrecht, Z, Alderweireld, T, ...

Using data collected in the DELPHI detector at LEP-1, measurements of the inclusive tau branching ratios for decay modes containing one, three, or five charged particles have been performed, giving...

Measurement of the Mass and Width of the W Boson in $e^+ e^-$ Collisions at $\sqrt{s}$ = 189 GeV (2001)

Abreu, P, Adam, W, Adye, T, Adzic, P, Albrecht, Z, Alderweireld, T, ...

A measurement of the W mass and width has been performed by the DELPHI collaboration using the data collected during 1998. The data sample has an integrated luminosity of 155 pb^{-1} and an average...

Search for a fermiophobic Higgs at LEP 2 (2001)

Abreu, P, Adam, W, Adye, T, Adzic, P, Ajinenko, I, Albrecht, Z, ...

Higgs bosons predicted by the fermiophobic scenario within Two Higgs Doublets Models were searched for in the data collected by the DELPHI detector at centre-of-mass energies between 189 GeV and 202...

Measurement of $V_{cb}$ from the decay process $\bar{B^0} \to D^{*+} \ell^- \bar{\nu}$ (2001)

Abreu, P, Adam, W, Adye, T, Adzic, P, Albrecht, Z, Alderweireld, T, ...

A new precise measurement of |V_{cb}| and of the branching ratio BR(\bar{B^0} -> D^{*+} \ell^- \bar{\nu_\ell}) has been performed using a sample of about 5000 semileptonic decays \bar{B^0} -> D^{*+}...

Search for the Standard Model Higgs boson at LEP in the year 2000 (2001)

Abreu, P, Adam, W, Adye, T, Adzic, P, Albrecht, Z, Alderweireld, T, ...

Searches for the Standard Model Higgs boson have been performed in the data collected by the DELPHI experiment at LEP in the year 2000 at centre-of-mass energies between 200 and...

Measurement of Trilinear Gauge Boson Couplings $WWV, (V \equiv Z, \gamma)$ in $e^+ e^-$ Collisions at 189 GeV (2001)

Abreu, P, Adam, W, Adye, T, Adzic, P, Albrecht, Z, Alderweireld, T, ...

Measurements of the trilinear gauge boson couplings $WW\gamma$ and $WWZ$ are presented using the data taken by DELPHI in 1998 at a centre-of-mass energy of 189~GeV and combined with DELPHI data at...

Update of the search for supersymmetric particles in scenarios with Gravitino LSP and Sleptons NLSP (2001)

Abreu, P, Adam, W, Adye, T, Adzic, P, Albrecht, Z, Alderweireld, T, ...

An update of the search for sleptons, neutralinos and charginos in the context of scenarios where the lightest supersymmetric particle is the gravitino and the next-to-lightest supersymmetric...

Search for sleptons in $e^+ e^-$ collisions at $\sqrt{s}$= 183 to 189 GeV (2001)

Abreu, P, Adam, W, Adye, T, Adzic, P, Ajinenko, I, Albrecht, Z, ...

Data taken by the {\tt DELPHI} experiment at centre-of-mass energies of 183~\GeV\ and 189~\GeV\ with a total integrated luminosity of 212 pb$^{-1} have been used to search for the supersymmetric...

Search for neutralino pair production at $\sqrt{s}$ = 189 GeV (2000)

Abreu, P, Adam, W, Adye, T, Adzic, P, Ajinenko, I, Albrecht, Z, ...

A search for pair-production of neutralinos at a LEP centre-of-mass energy of 189 GeV gave no evidence for a signal. This limits the neutralino production cross-section and excludes regions in the...

Study of Dimuon Production in Photon-Photon Collisions and Measurement of QED Photon Structure Functions at LEP (2000)

Abreu, P, Adam, W, Adye, T, Adzic, P, Ajinenko, I, Albrecht, Z, ...

Muon pair production in the process $e^+e^-\to e^+e^-\mu^+\mu^-$ is studied using the data taken at LEP1 ($\sqrt{s}\simeq m_Z$) with the DELPHI detector during the years 1992-1995. The corresponding...

Measurement of the ZZ cross-section in $e^+ e^-$ interactions at 183-189 GeV (2000)

Abreu, P, Adam, W, Adye, T, Adzic, P, Ajinenko, I, Albrecht, Z, ...

Measurements of on-shell $ZZ$ production are described, using data collected by DELPHI in 1997 and 1998, at centre-of-mass energies $\sqrt s$ = 182.6 GeV and 188.6 GeV respectively. Results obtained...

Search for Spontaneous R-parity violation at $\sqrt{s}$ = 183 GeV and 189 GeV (2000)

Abreu, P, Adam, W, Adye, T, Adzic, P, Albrecht, Z, Alderweireld, T, ...

Searches for spontaneous $R$-parity violating signals at $\sqrt{s}=183$\,GeV and \mbox{$\sqrt{s}=189$\,GeV} have been performed using 1997 and 1998 DELPHI data, under the assumption of $R$-parity...

Search for R-parity violation with a $\overline{U}\overline{D}\overlin e{D}$ coupling at $\sqrt{s}$=189 GeV (2000)

Abreu, P, Adam, W, Adye, T, Adzic, P, Ajinenko, I, Albrecht, Z, ...

Searches for pair production of gauginos and squarks in $e^{+} e^{-}$ collisions at a centre-of-mass energy of 189 GeV have been performed on data corresponding to an integrated luminosity of 158...

A search for invisible Higgs bosons produced in $e^{+} e^{-}$ interactions up to $\sqrt{s}$ = 189 GeV (2000)

Abreu, P, Adam, W, Adye, T, Adzic, P, Albrecht, Z, Alderweireld, T, ...

Searches for {\mbox{$ {\mathrm H} {\mathrm Z} $}} production d with the Higgs boson decaying into an invisible final state have been performedd the data collected by the DELPHI experimentd up to the...

Search for the sgoldstino at $\sqrt{s}$ from 189 to 202 GeV (2000)

Abreu, P, Adam, W, Adye, T, Adzic, P, Albrecht, Z, Alderweireld, T, ...

A search for the supersymmetric partner of the goldstino, the sgoldstino S, at LEP2 is presented. The production S$\gLWahlen, H

Study of $B^0_s - \overline{B^0_s}$ oscillations and $B^0_s$ lifetimes using hadronic decays of $B^0_s$ mesons (2000)

Abreu, P, Adam, W, Adye, T, Adzic, P, Ajinenko, I, Albrecht, Z, ...

The combination of these results with those obtained using $\mathrm{\rm{D}_{s}^{\pm}} \ell^{\mp}$ sample gives: %\cite{ref:dsl} \bes \ba{c} \dms > 4.9~\mbox{ps}^{-1}~\mbox{at the 95\% C.L.} \\...

Search for supersymmetric partners of top and bottom quarks at $\sqrt{s}$= 189 GeV (2000)

Abreu, P, Adam, W, Adye, T, Adzic, P, Ajinenko, I, Albrecht, Z, ...

Searches for supersymmetric partners of top and bottom quarks are presented using data taken by the DELPHI experiment at LEP in 1997 and 1998. No deviations from standard model expectations are...

Determination of the $e^+ e^- \to \gamma \gamma(\gamma)$ cross-section at centre-of-mass energies ranging from 189 GeV to 202 GeV (2000)

Abreu, P, Adam, W, Adye, T, Adzic, P, Albrecht, Z, Alderweireld, T, ...

A test of the QED process \eeintogg(\fot) is reported. The data analysed were collected with the DELPHI detector in 1998 and 1999 at the highest ener\-gies achieved at LEP, reaching 202 GeV in the...

Limits on the Masses of Supersymmetric Particles at $\sqrt{s}$=189 GeV (2000)

Abreu, P, Adam, W, Adye, T, Adzic, P, Ajinenko, I, Albrecht, Z, ...

Searches for charginos, neutralinos and sleptons at LEP2 centre-of-mass energies from 130 GeV to 189 GeV have been used to set lower limits on the mass of the Lightest Supersymmetric Particle and...

Rapidity-Rank Structure of $p\overline{p}$ Pairs in Hadronic $Z^{0}$ Decays (2000)

Abreu, P, Adam, W, Adye, T, Adzic, P, Ajinenko, I, Albrecht, Z, ...

The rapidity-rank structure of \ppb pairs is used to analyze the mechanism of baryon production in hadronic \zz decay. The relative occurrence of the rapidity-ordered configuration \pmpb, where $M$...

Measurement of the $B^0_s$ Lifetime and Study of $B^0_s - \overline{B^0_s}$ Oscillations using $D_{s}l$ Events (2000)

Abreu, P, Adam, W, Adye, T, Adzic, P, Albrecht, Z, Alderweireld, T, ...

Lifetime and oscillations of $\Bs$ mesons have been studied in eventswith a large transverse momentum lepton and a $\Ds$ of opposite electric charge>the same hemisphere, selected from about 3.6...

Search for SUSY with R-parity violating $LL\overline{E}$ couplings at $\sqrt{s}$=189 GeV (2000)

Abreu, P, Adam, W, Adye, T, Adzic, P, Albrecht, Z, Alderweireld, T, ...

Searches for pair production of supersymmetric particlesunder the assumption that $R$--parity is not conserved are presented,based on data recorded by the DELPHI detector in 1998from e$^{+}$e$^{-}$...

Update of the search for charginos nearly mass-degenerate with the lightest neutralino (2000)

Abreu, P, Adam, W, Adye, T, Adzic, P, Ajinenko, I, Albrecht, Z, ...

The data collected by DELPHI in 1998 at the centre-of-mass energy of 189~GeVhave been used to update the search for charginos nearly mass-degenerate withthe lightest supersymmetric particle, which is...

Measurement and Interpretation of Fermion-Pair Production at LEP Energies of 183 and 189 GeV (2000)

Abreu, P, Adam, W, Adye, T, Adzic, P, Albrecht, Z, Alderweireld, T, ...

An analysis of the data collected in 1997 and 1998 with the DELPHIdetector at $e^+e^-$ collision energies close to 183 and 189GeV was performed in order to extract the hadronic and leptonic...

Cross-Sections and Leptonic Forward-Backward Asymmetries from the $Z^0$ Running of LEP (2000)

Abreu, P, Adam, W, Adye, T, Adzic, P, Alekseev, G D, Alemany, R, ...

During 1993 and 1995 LEP was run at 3 energies near the Z$^0$ peak in order to give improved measurements of the mass and width of the resonance. During 1994, LEP operated only at the Z$^0$peak. In...

Measurement of the $\overline{B} \to D^{(*)}\pi l\overline{\nu}_l$ Branching Fraction (2000)

Abreu, P, Adam, W, Adye, T, Adzic, P, Ajinenko, I, Albrecht, Z, ...

A study of $b$ semileptonic decays into $D$, $D\pi^{\pm}$ and $D^*\pi^{\pm}$ final states is presented.The $D^0$, $D^+$ and $D^{*+}$ mesons are exclusively reconstructed in $Z$ decay data recorded...

W pair production cross-section and W branching fractions in $e^{+}e^{-}$ interactions at 189 GeV (2000)

Abreu, P, Adam, W, Adye, T, Adzic, P, Albrecht, Z, Alderweireld, T, ...

The cross-section for the process $e^+e^-\rightarrow W^+W^-$has been measured with the data sample collected by DELPHIat an average centre-of-mass energy of 189~GeV andcorresponding to an integrated...

Searches for Neutral Higgs Bosons in $e^+ e^-$ Collisions around $\sqrt{s}$ = 189 GeV (2000)

Abreu, P, Adam, W, Adye, T, Adzic, P, Albrecht, Z, Alderweireld, T, ...

Searches for neutral Higgs bosons in the Standard Model and the MSSM havebeen performed using data collected by the DELPHI experiment at acentre-of-mass energy of 188.7 GeV, corresponding toan...

A Study of the Lorentz Structure in $\tau$ Decays (2000)

Abreu, P, Adam, W, Adye, T, Adzic, P, Albrecht, Z, Alderweireld, T, ...

This paper describes a measurement of the Michel parameters, $\eta$, $\rho$, $\xi$, $\xi \delta$, and the average $\nu_{\tau}$helicity, $h_{\nu_{\tau}}$, in $\tau$ lepton decays together withthe...

Search for Heavy Stable and Long-Lived Particles in $e^{+}e^{-}$ Collisions at $\sqrt{s}$=189 GeV (2000)

Abreu, P, Adam, W, Adye, T, Adzic, P, Albrecht, Z, Alderweireld, T, ...

A search for stable and long-lived heavy charged particles was performed using the data taken by the DELPHI experiment at an energy of 189 GeV. The Cherenkov light detected in the Ring Imaging...

Determination of |$V_{ub}$|/|$V_{cb}$| with DELPHI at LEP (2000)

Abreu, P, Adam, W, Adye, T, Adzic, P, Albrecht, Z, Alderweireld, T, ...

The ratio of the CKM quark-mixing matrix elements |V_{ub}|/|V_{cb}|has been measured using B hadron semileptonic decays.The analysis is based on a novel technique, recently proposed by theoreticians,...

Photon Events with Missing Energy at $\sqrt{s}$= 183 to 189 GeV (2000)

Abreu, P, Adam, W, Adye, T, Adzic, P, Ajinenko, I, Albrecht, Z, ...

The production of single photons has been studiedin the reaction e+e- --> gamma+ invisible particles at centre-of-mass energies of 183~GeV and 189~GeV.A previously published analysis of events with...

Charged and Identified Particles in the Hadronic Decay of W Bosons and in $e^{+}e^{-} \to q\overline{q}$ from 130 to 200 GeV (2000)

Abreu, P, Adam, W, Adye, T, Adzic, P, Albrecht, Z, Alderweireld, T, ...

Inclusive distributions of charged particles in hadronic Wdecays are experimentally investigated using the statisticscollected by the DELPHI experiment at LEP during 1997, 1998and 1999, at...

Search for supersymmetric particles in scenarios with gravitino LSP and stau NLSP (2000)

Abreu, P, Adam, W, Adye, T, Adzic, P, Albrecht, Z, Alderweireld, T, ...

Sleptons, neutralinos and charginos were searched for in the context of scenarios where the lightest supersymmetric particle isthe gravitino.It was assumed that the stau is the next-to-lightest...

Identified Charged Particles in Quark and Gluon Jets (2000)

Abreu, P, Adam, W, Adye, T, Adzic, P, Albrecht, Z, Alderweireld, T, ...

A sample of 2.2 million hadronic \z decays, selected fythe {\sc Delphi} detector at {\sc Lep} during 1994-199nimprovedmeasurement of inclusive distributions of \pie, \kp anrantiparticles in gluon and...

Search for charginos in $e^+ e^-$ interactions at $\sqrt{s}$= 189 GeV (2000)

Abreu, P, Adam, W, Adye, T, Adzic, P, Ajinenko, I, Albrecht, Z, ...

An update of the searches for charginos and gravitinodon a data sample corresponding to the 158 pb$^{-1}$ rIdetector in 1998, at a centre-of-mass energy of 18asignal was found. The lower mass limits...

Inclusive $\Sigma^{-}$ and $\Lambda(1520)$ production in hadronic Z decays (2000)

Abreu, P, Adam, W, Adye, T, Adzic, P, Ajinenko, I, Albrecht, Z, ...

Production of $\sm$ and $\lft$ in hadronic Z decays has been measuredusing the \delphi detector at \lep. The $\sm$ is directly reconstructed as acharged track in the \delphi microvertex detector and...

Hadronization properties of b quarks compared to light quarks in $e^{+}e^{-} \to q\overline{q}$ from 183 to 200 GeV (2000)

Abreu, P, Adam, W, Adye, T, Adzic, P, Albrecht, Z, Alderweireld, T, ...

The DELPHI detector at LEP has collected 54 pb$^{-1}$ of dataat a centre-of-mass energy around 183 GeV during 1997,158 pb$^{-1}$ around 189 GeV during 1998,and 187 pb$^{-1}$ between 192 and 200 GeV...

Consistent Measurements of $\alpha_{s}$ from Precise Oriented Event Shape Distributions (2000)

Abreu, P, Adam, W, Adye, T, Adzic, P, Albrecht, Z, Alderweireld, T, ...

An updated analysis using about 1.5 million events recorded at $\sqrt{s} =M_Z$ with the DELPHI detector in 1994 is presented. Eighteen infrared and collinear safe event shape observables are measured...

Two-dimensional Analysis of the Bose-Einstein Correlations in $e^{+}e^{-}$ Annihilation at the $Z^{0}$ peak (1999)

Abreu, P, Adam, W, Adye, T, Adzic, P, Albrecht, Z, Alderweireld, T, ...

The study of the directional dependence of two-particle correlations in the hadronic decays of the $Z^0$ boson is performed using the data collected by the DELPHI experiment in the 1992--1995 running...

Upper Limit for the Decay $B^{-} \to \tau^{-}\overline{\nu}_{\tau}$ and Measurement of the $b \to \tau\overline{\nu}_{\tau}X$ Branching Ratio (1999)

Abreu, P, Adam, W, Adye, T, Adzic, P, Ajinenko, I, Albrecht, Z, ...

Using the data sample of hadronic $Z^0$ decays collected by the DELPHI experiment in the 1992-1995 LEP1 period, the leptonic decay of the charged $B$ mesons (\btauex) has been studied. The analysis...

Search for chargino pair production in scenarios with gravitino LSP and stau NLSP at $\sqrt{s} \sim$ 183 GeV at LEP (1999)

Abreu, P, Adam, W, Adye, T, Adzic, P, Albrecht, Z, Alderweireld, T, ...

Promptly decaying lightest charginos were searched for in the context of scenarios with gravitino LSP. It was assumed that the stau is the next to lightest supersymmetric particle (NLSP). Data...

Energy Dependence of Inclusive Spectra in $e^{+} e^{-}$ Annihilation (1999)

Abreu, P, Adam, W, Adye, T, Adzic, P, Albrecht, Z, Alderweireld, T, ...

Inclusive charged hadron distributions as obtaind from the DELPHI measurements at 130, 136, 161, 172 and 183 GeV are presented as a function of the variables rapidity, $\xi_p$, $p$ and transversal...

Search for the Higgs boson in events with isolated photons at LEP 2 (1999)

Abreu, P, Adam, W, Adye, T, Adzic, P, Ajinenko, I, Albrecht, Z, ...

A search for the Higgs boson in final states with one, two or three isolated photons has been performed based on data taken at LEP 2 by the DELPHI detector. The data analysed correspond to a total...

A search for invisible Higgs bosons produced in $e^{+} e^{-}$ interactions at LEP 2 energies (1999)

Abreu, P, Adam, W, Adye, T, Adzic, P, Albrecht, Z, Alderweireld, T, ...

Searches for HZ production with the Higgs boson decaying into an invisible final state have been performed with the data collected by the DELPHI experiment up to the centre-of-mass energy of 183 GeV....

Measurements of the Trilinear Gauge Boson Couplings WWV $(V \equiv \gamma,Z)$ in $e^+ e^-$ Collisions at 183 GeV (1999)

Abreu, P, Adam, W, Adye, T, Adzic, P, Ajinenko, I, Albrecht, Z, ...

Measurements of the trilinear gauge boson couplings $WW\gamma$ and $WWZ$ are presented from data taken by DELPHI in 1997 at an energy of 183 GeV. From a study of the reactions $e^+ e^- \to W^+ W^-,...

Measurement of the rate of $b\overline{b} b\overline{b}$ events in hadronic Z decays and the extraction of the gluon splitting into $b\overline{b}$ (1999)

Abreu, P, Adam, W, Adye, T, Adzic, P, Ajinenko, I, Albrecht, Z, ...

The rate $Z \rightarrow b\overline{b}b\overline{b}$ was measured using about $2 x 10^6$ hadronic decays collected by the DELPHI experiment in 1994 and 1995. Events were forced into 3-jets with...

Measurements of the Z Partial Decay Width into $c\overline{c}$ and Multiplicity of Charm Quarks per b Decay (1999)

Abreu, P, Adam, W, Adye, T, Adzic, P, Ajinenko, I, Albrecht, Z, ...

The partial decay width $R_c$ of the $Z$ into $c\bar{c}$ quark pair and the number of charm quarks $n_c$ per $b$ decay are measured with the DELPHI detector at \mbox{LEP 1}. Particle identification...

Determination of $P(c \to D^{*+})$ and $BR(c \to l^{+})$ at LEP 1 (1999)

Abreu, P, Adam, W, Adye, T, Adzic, P, Ajinenko, I, Albrecht, Z, ...

The probability $P(c \rightarrow D^{*+})$ that a charm quark fragments into a $D^{*+}$ meson and the $c \rightarrow l^+$ semileptonic branching fraction were measured in $Z^0\ $ decay into $c\bar{c}$...

Search for Charged Higgs Bosons at LEP 2 (1999)

Abreu, P, Adam, W, Adye, T, Adzic, P, Albrecht, Z, Alderweireld, T, ...

A search for pair produced charged Higgs bosons has been performed in the high energy data collected by DELPHI at LEP with $\sqrt{s} =$ 161, 172 and 183~GeV. The analysis uses the $\tau \nu \tau...

Energy dependence of event shapes and of $\alpha_s$ at LEP 2 (1999)

Abreu, P, Adam, W, Adye, T, Adzic, P, Albrecht, Z, Alderweireld, T, ...

Infrared and collinear safe event shape distributions and their mean values are determined using the data taken at ve di erent centre of mass energies above $M_Z$ with the DELPHI detector at LEP....

Measurements of the leptonic branching fractions of the $\tau$ (1999)

Abreu, P, Adam, W, Adye, T, Adzic, P, Ajinenko, I, Albrecht, Z, ...

Data collected with the DELPHI detector from 1993 to 1995 combined with previous DELPHI results for data from 1991 and 1992 yield the branching fractions $ B({\tau \rightarrow \mbox{\rm e} \nu...

W pair production cross-section and W branching fractions in $e^+ e^-$ interactions at 183 GeV (1999)

Abreu, P, Adam, W, Adye, T, Adzic, P, Albrecht, Z, Alderweireld, T, ...

The cross-section for the process $e^+e^-\rightarrow W^+W^-$ has been measured with the data sample collected by DELPHI at an average centre-of-mass energy of 182.65 GeV and corresponding to an...

Search for supersymmetry with R-parity violating $LL\overline{E}$ couplings at $\sqrt{s}$ = 183 GeV (1999)

Abreu, P, Adam, W, Adye, T, Adzic, P, Ajinenko, I, Albrecht, Z, ...

Searches for pair production of supersymmetric particles in e$^{+}$e$^{-}$ collisions at centre-of-mass energy of 183~GeV have been performed on DELPHI data under the assumption that $R$-parity is...

Search for charginos nearly mass-degenerate with the lightest neutralino (1999)

Abreu, P, Adam, W, Adye, T, Adzic, P, Albrecht, Z, Alderweireld, T, ...

A search for charginos with masses close to the mass of the lightest neutralino is reported, based on the data collected with the DELPHI detector at LEP from 1995 to 1997 at centre-of-mass energies...

Measurement of the Lifetime of b-baryons (1999)

Abreu, P, Adam, W, Adye, T, Adzic, P, Albrecht, Z, Alderweireld, T, ...

The average lifetime of weakly decaying $b$-baryons was studied using 3.6 million $Z^0$ hadronic decays collected by the DELPHI detector at LEP. The measurement of the proper decay time distribution...

Search for neutral Higgs bosons in $e^{+}e^{-}$ collisions at $\sqrt{s}$ = 183 GeV (1999)

Abreu, P, Adam, W, Adye, T, Adzic, P, Ajinenko, I, Albrecht, Z, ...

Neutral Higgs bosons were searched for in the data collected by DELPHI at a centre-of-mass energy of 183 GeV, corresponding to an integrated luminosity of 54 pb/sup -1/

Measurement of the Forward-Backward Asymmetry of $c$ and $b$ Quarks at the $Z$ Pole using Reconstructed $D$ Mesons (1999)

Abreu, P, Adye, T, Adzic, P, Albrecht, Z, Alderweireld, T, Alekseev, G D, ...

A measurement of the forward--backward asymmetry of $e^{+}e^{-} \to c\bar{c}$ and $e^{+}e^{-} \to b\bar{b}$ on the $Z$ resonance is performed using about 3.5 million hadronic $Z$ decays collected by...

Measurement and Interpretation of Fermion-Pair Production at LEP energies from 130 to 172 GeV (1999)

Abreu, P, Adam, W, Adye, T, Adzic, P, Albrecht, Z, Alderweireld, T, ...

The data collected with the DELPHI detector at centre-of-mass energies between 130 and 172~$\GeV$, during LEP operation in 1995 and 1996, have been used to determine the hadronic and leptonic...

Study of the four-jet anomaly observed at LEP centre-of-mass energies of 130 and 136 GeV (1999)

Abreu, P, Adam, W, Adye, T, Adzic, P, Ajinenko, I, Albrecht, Z, ...

The four-jet events collected by \delphi\ during the speciaLEP run at centre-of-mass energies of 130 and 136 \GeV\ in 1997 with an integrated luminosity of $5.9 \ipb $ are analysed. Their rate and...

Measurement of $A_{FB}^{\overline{b}b}$ in Hadronic Z Decays using a Jet Charge Technique (1999)

Abreu, P, Adam, W, Adye, T, Adzic, P, Albrecht, Z, Alderweireld, T, ...

The $\BB$ forward-backward asymmetry %, $\AFBbb$, has been determined from the average charge flow %, $\langle Q_{FB}\rangle$, measured in a sample of 3,500,000 hadronic Z decays collected with the...

A precise measurement of the partial decay width ratio $R_{b}^{0} = \Gamma_{b\overline{b}}/\Gamma_{had}$ (1998)

Abreu, P, Adam, W, Adye, T, Adzic, P, Albrecht, Z, Alderweireld, T, ...

The partial decay width of the Z to $\bb$ quark pairs has beenmeasured by the DELPHI detector at LEP using data taken in the years1992 to 1995.Decays of b-hadrons were tagged by several methods...

Search for Leptoquarks and FCNC in $e^{+} e^{-}$ annihilations at $\sqrt{s}$=183 GeV (1998)

Abreu, P, Adam, W, Adye, T, Adzic, P, Alderweireld, T, Alekseev, G D, ...

A search for events with one jet and at most one isolated leptonused data taken at LEP-2 by the DELPHI detector.These data were accumulated at a center-of-mass energy of183 GeV and correspond to an...

Search for charginos, neutralinos and gravitinos in $e^{+} e^{-}$ interactions at $\sqrt{s}$=183 GeV (1998)

Abreu, P, Adam, W, Adye, T, Adzic, P, Ajinenko, I, Alderweireld, T, ...

An update of the searches for charginos and neutralinos is presented, basedon a data sample corresponding to the 53.9 pb$^{-1}$ recorded by the DELPHIdetector in 1997, at a centre-of-mass energy of...

Search for composite and exotic fermions at LEP 2 (1998)

Abreu, P, Adam, W, Adye, T, Adzic, P, Alderweireld, T, Alekseev, G D, ...

A search for unstable heavy fermions with the DELPHI detector at LEP is reported. Sequential and non-canonical leptons, as well as excited leptons and quarks, are considered. The data analysed...

Search for lightest neutralino and stau pair production in light gravitino scenarios with stau NLSP (1998)

Abreu, P, Adam, W, Adye, T, Adzic, P, Alderweireld, T, Alekseev, G D, ...

Promptly decaying lightest neutralinos and long-lived staus are searched for in the context of light gravitino scenarios. It is assumed that the stau is the next to lightest supersymmetric particle...

A search for heavy stable and long-lived squarks and sleptons in $e^+ e^-$ collisions at energies from 130 to 183 GeV (1998)

Abreu, P, Adam, W, Adye, T, Adzic, P, Alderweireld, T, Alekseev, G D, ...

A search for stable and long-lived heavy charged particles used the data taken by the DELPHI experiment at energies from 130 to 183 GeV. The Cherenkov light detected in the Ring Imaging Cherenkov...

A search for $\eta'_c$ production in photon-photon fusion at LEP (1998)

Abreu, P, Adam, W, Adye, T, Adzic, P, Alekseev, G D, Alemany, R, ...

A search for the production of the $\eta'_c$ meson, the first radial excitation of the ground state of charmonium $\eta_c$(2980), in the photon-photon fusion reaction at LEP has been performed using...

Two-particle angular correlations in $e^+ e^-$ interactions compared with QCD predictions (1998)

Abreu, P, Adam, W, Adye, T, Adzic, P, Ajinenko, I, Alekseev, G D, ...

Two--particle angular correlations in jet cones have been measured in $e^+e^-$ annihilation into hadrons at LEP energies ($\sqrt{s}=$ 91 and 183~GeV) and are compared with QCD predictions using the...

Search for Pair-Produced Neutralinos in Events with Photons and Missing Energy from $e^{+}e^{-}$ Collisions at $\Sqrt{s}=130-183$ GeV (1998)

Abreu, P, Adye, T, Adzic, P, Ajinenko, I, Alekseev, G D, Alemany, R, ...

The events with two photons and missing (transverse) energy collected by the DELPHI detector at centre-of-mass energies between 130~GeV and 183~GeV have been studied to search for processes of the...

Measurement of |V_{cs}| using W decays at LEP2 (1998)

Abreu, P, Adam, W, Adye, T, Adzic, P, Ajinenko, I, Alekseev, G D, ...

Decays of $W^{\pm}$ bosons, produced at LEP2, have been used to measure the $|V_{cs}|$ element of the Cabibbo-Kobayashi-Maskawa matrix. Values for $|V_{cs}|$ were extracted both from the measured...

Search for scalar fermions and long-lived scalar leptons at centre-of-mass energies of 130 GeV to 172 GeV (1998)

Abreu, P, Adam, W, Adye, T, Adzic, P, Ajinenko, I, Alekseev, G D, ...

Data taken by DELPHI during the 1995 and 1996 LEP runs have been used to search for the supersymmetric partners of electron, muon and tau leptons and of top and bottom quarks. The observations are in...

$\pi^{\pm}, K^{\pm}, p$ and $\overline{p}$ production in $Z^{0} \rightarrow q\overline{q}, Z^{0} \rightarrow b\overline{b}, Z^{0} \rightarrow u\overline{u}, d\overline{d}, s\overline{s}$ (1998)

Abreu, P, Adam, W, Adye, T, Adzic, P, Ajinenko, I, Alekseev, G D, ...

The DELPHI experiment at LEP uses Ring Imaging Cherenkov detectors for particle identification. The good understanding of the RICH detectors allows the identification of charged pions, kaons and p...

Measurement of the $e^+ e^- \to \gamma\gamma (\gamma)$ cross section at the LEP energies (1998)

Abreu, P, Adam, W, Adye, T, Adzic, P, Alekseev, G D, Alemany, R, ...

The total and the differential cross-sections for the reaction $e^+e^-\rightarrow \gamma\gamma(\gamma)$ have been measured with the DELPHI detector at LEP % with at centre-of-mass energies from 1 30...

Measurement of the charged particle multiplicity of weakly decaying B hadrons (1998)

Abreu, P, Adam, W, Adye, T, Adzic, P, Ajinenko, I, Alekseev, G D, ...

From the $Z$ decays recorded in 1994 and 1995 by the DELPHI detector at LEP, the charged particle multiplicity of weakly decaying $B$ hadrons was measured to be: \begin{center} $4.97 \pm 0.03 \pm...

First evidence for a charm radial excitation, $D^{*}'$ (1998)

Abreu, P, Adam, W, Adye, T, Adzic, P, Ajinenko, I, Alekseev, G D, ...

Using D$^{*+}$ mesons exclusively reconstructed in the DELPHI detector at LEP, an excess of $66\pm14(\mbox{stat.})$ events is observed in the D$^{*+}\pi^+\pi^-$ final state with a mass of...

A study of the hadronic resonance structure in the decay $\tau \to 3\pi\nu_{\tau}$ (1998)

Abreu, P, Adam, W, Adye, T, Adzic, P, Alekseev, G D, Alemany, R, ...

The hadronic structure of the decay of the $\tau$ lepton to three charged particles, $\tau\rightarrow 3\pi\nu_\tau$, is studied using data collected by the DELPHI detector at LEP between 1992 and...

Measurement of the inclusive charmless and double-charm B branching ratios (1998)

Abreu, P, Adam, W, Adye, T, Adzic, P, Alekseev, G D, Alemany, R, ...

The DELPHI experiment at LEP has measured the inclusive charmless $B$ hadron decay branching ratio, the $B$ branching ratio into two charmed particles, and the total number of charmed particles per...

Measurement of Trilinear Gauge Couplings in $e^+ e^-$ Collisions at 161 GeV and 172 GeV (1998)

Abreu, P, Adam, W, Adye, T, Adzic, P, Alekseev, G D, Alemany, R, ...

Trilinear gauge boson couplings are measured using data taken by DELPHI at 161~GeV and 172~GeV. Values for $WWV$ couplings ($V=Z, \gamma$) are determined from a study of the reactions \eeWW\ and...

Measurement of the W-pair cross-section and of the W mass in $e^+ e^-$ interactions at 172 GeV (1998)

Abreu, P, Adam, W, Adye, T, Adzic, P, Ajinenko, I, Alekseev, G D, ...

From a data sample of $9.98 {\mathrm{~pb^{-1}}}$ integrated luminosity collected by DELPHI at a centre-of-mass energy of 172 GeV, 118 events were selected as W-pair candidates. From these, the...

On the Treatment of Energy Loss in Track Fitting (1998)

R. Frühwirth, S. Frühwirth-Schnatter, Osterreichischen Akademie Der

Introduction In track reconstruction with the Kalman filter both measurement and process noise are implicitely assumed to be Gaussian. This assumption is justified in many cases. As far as the...

Search for charged Higgs bosons in $e^+ e^-$ collisions at $\sqrt{s}$ = 172 GeV (1997)

Abreu, P, Adam, W, Adye, T, Adzic, P, Alekseev, G D, Alemany, R, ...

This paper presents results on charged Higgs boson production, based on LEP data collected at $\sqrt{s} = 172$ GeV, that complement the previous DELPHI results obtained at centre of mass energies up...

$m_b$ at $M_Z$ (1997)

Abreu, P, Adam, W, Adye, T, Adzic, P, Ajinenko, I, Alekseev, G D, ...

The value of the $b$ quark mass at the $M_Z$ scale defined in the $\overline{MS}$ renormalization scheme, $m_b(M_Z)$, is determined using 2.8 million hadronic Z decays collected during 1992-1994 by...

Charged-particle multiplicity in $e^+ e^- \rightarrow q \overline{q}$ events at 161 and 172 GeV and from the decay of the W boson (1997)

Abreu, P, Adam, W, Adye, T, Ajinenko, I, Alekseev, G D, Alemany, R, ...

The data collected by DELPHI in 1996 have been used to measure the average charged particle multiplicities and dispersions in $q\bar{q}$ events at centre-of-mass energies of $\sqrt{s}=161$~GeV and...

Search for $B^{0}_s -\overline{B^{0}_s}$ oscillations (1997)

Adam, W, Adye, T, Ajinenko, I, Alekseev, G D, Alemany, R, Allport, P P, ...

was obtained by combining the results obtained in three channels.

Measurement of the triple gluon vertex from double quark tagged 4-jet events (1997)

Abreu, P, Adam, W, Adye, T, Adzic, P, Alekseev, G D, Alemany, R, ...

The 4-jet events collected by the DELPHI experiment at LEP1 in 1992, 1993 and 1994 are analysed to determine the contribution of the triple-gluon vertex. Two of the four jets are tagged as jets from...

Measurement of the Quark and Gluon Fragmentation Functions in $Z^0$ Hadronic Decays (1997)

Abreu, P, Adam, W, Adye, T, Ajinenko, I, Alekseev, G D, Alemany, R, ...

The fragmentation functions and multiplicities in $b\overline{b}$ and light quark events are compared. The measured transverse and longitudinal components of the fragmentation function allow the...

Search for charginos, neutralinos and gravitinos at LEP (1997)

Abreu, P, Adam, W, Adye, T, Ajinenko, I, Alekseev, G D, Alemany, R, ...

An update of the searches for charginos and neutralinos in DELPHI is presented, based mainly on recent data collected at centre-of-mass energies of 161~GeV and 172~GeV. No signal is found. Except for...

Search for neutral and charged Higgs bosons in $e^+ e^-$ collisions at $\sqrt{s}= 161 GeV$ and $172 GeV$ (1997)

Abreu, P, Adam, W, Adye, T, Adzic, P, Ajinenko, I, Alekseev, G D, ...

A search for neutral and charged Higgs bosons has been performed in the data collected by the {\sc DELPHI} detector at centre-of-mass energies of 161~GeV and 172~GeV. The analysis assumes either the...

Observation of charge ordering in particle production in hadronic $Z^0$ decay (1997)

Abreu, P, Adam, W, Adye, T, Adzic, P, Alekseev, G D, Alemany, R, ...

Analysis of the rapidity structure of charge correlations in hadronic events from $Z^0$ decays gives evidence for chain-like charge-ordering of particle production along the thrust axis, as predicted...

Measurement of the spin density matrix for the $\rho^0$, $K^{*0}(892)$ and $\phi$ produced in $Z^0$ Decays (1997)

Abreu, P, Adam, W, Adye, T, Alekseev, G D, Alemany, R, Allport, P P, ...

The spin density matrix elements for the $\rho^0$, K$^{*0}(892)$ and $\phi$ produced in hadronic Z$^0$ decays are measured in the DELPHI detector. There is no evidence for spin alignment of the...

A study of the reaction $e^+ e^- \rightarrow \mu^+ \mu^-\gamma_{ISR}$ at LEP and search for new physics at annihilation energies near 80 GeV (1997)

Abreu, P, Adam, W, Adye, T, Ajinenko, I, Alekseev, G D, Alemany, R, ...

A study of the channel $e^{+}e^{-}~\rightarrow~\mu^{+}\mu^{-}\gamma_{\ sc ISR}$, where $\gamma_{\sc ISR}$ is an initial state radiation photon, is presented using data collected by the DELPHI...

Measurement of the transverse spin correlation in $Z \to \tau^+\tau^-$ decays (1997)

Abreu, P, Adam, W, Adye, T, Ajinenko, I, Alekseev, G D, Alemany, R, ...

The measurement of the correlation between the transverse spin components of $\tau^+\tau^-$ pairs collected during 1992 to 1994 with the DELPHI detector at LEP1 is presented. A value \begin{center}...

Rapidity correlations in $\Lambda$ baryon and proton production in hadronic $Z^0$ decays (1997)

Abreu, P, Adam, W, Adye, T, Ajinenko, I, Alekseev, G D, Alemany, R, ...

In an analysis of multihadronic events recorded at LEP by DELPHI in the years 1992 through 1994, charged hadrons are identified using the measurement of their energy loss and their Cherenkov angle....

Measurement and interpretation of the W-pair cross-section in $e^+ e^-$ interactions at 161 GeV (1997)

Abreu, P, Adam, W, Adye, T, Adzic, P, Ajinenko, I, Alekseev, G D, ...

In 1996 LEP ran at a centre-of-mass energy of 161~GeV, just above the threshold of W-pair production. DELPHI accumulated data corresponding to an integrated luminosity of $9.93 {\mathrm{~pb^{-1}}}$,...

Identified particles in quark and gluon jets (1997)

Abreu, P, Adam, W, Adye, T, Ajinenko, I, Alekseev, G D, Alemany, R, ...

A sample of about 1.4 million hadronic \z decays, selected among the data recorded by the DELPHI detector at LEP during 1994, was used to measure for the first time the momentum spectra of \kp, \ko,...

Search for Stable Heavy Charged Particles in $e^+ e^-$ Collisions at $\sqrt{s}$ = 130-136, 161 and 172 GeV (1997)

Abreu, P, Adam, W, Adye, T, Ajinenko, I, Alekseev, G D, Alemany, R, ...

A search for stable or long-lived heavy charged particles in $e^+e^-$ interactions at energies of 130-136, 161 and 172 GeV has been performed using the data taken by the DELPHI experiment at LEP. The...

Search for the $B_c$ meson (1997)

Abreu, P, Adam, W, Adye, T, Ajinenko, I, Alekseev, G D, Alemany, R, ...

constant over the range of predicted $B_c\upm$ lifetimes.

Search for Neutral Heavy Leptons Produced in Z Decays (1997)

Abreu, P, Adam, W, Adye, T, Ajinenko, I, Alekseev, G D, Alemany, R, ...

Weak isosinglet Neutral Heavy Leptons ($\nu_m$) have been searched for using data collected by the DELPHI detector corresponding to $3.3\times 10^{6}$ hadronic~Z$^{0}$ decays at LEP1. Four separate...

A Measurement of $\alpha_s$ from the Scaling Violation in $e^+ e^-$ Annihilation (1997)

Abreu, P, Adam, W, Adye, T, Ajinenko, I, Alekseev, G D, Alemany, R, ...

The hadronic fragmentation functions of the various quark flavours and of gluons are measured in a study of the inclusive hadron production from $\zz$ decays with the DELPHI detector and are compared...

Search for excited leptons in $e^+ e^-$ collisions at $\sqrt{s}$ =161 GeV (1996)

Abreu, P, Adam, W, Adye, T, Ajinenko, I, Alekseev, G D, Alemany, R, ...

A search with the DELPHI detector at LEP for excited leptons ($e^*$, $\mu^*$, $\tau^*$ and $\nu^*$) decaying through $\gamma$, W or Z transitions is reported. The data used correspond to an...

A precise measurement of the $B^{0}_{d}$ meson lifetime using a new technique (1996)

Abreu, P, Adam, W, Adye, T, Ajinenko, I, Alekseev, G D, Alemany, R, ...

From data recorded by DELPHI between 1991 and 1994, which correspond to 3.2 million hadronic $\mbox{Z}^0$ decays, a measurement of the $\Bdb$ meson lifetime has been performed based on the inclusive...

Search for Lepton Flavour Number violating $Z^0$-Decays (1996)

Abreu, P, Adam, W, Adye, T, Ajinenko, I, Alekseev, G D, Alemany, R, ...

A search for lepton flavour number violating $Z^0$ decays in the channels \begin{center} $Z^0\rightarrow \mu\tau$,\\ $Z^0\rightarrow e\tau$, \\ $Z^0\rightarrow e\mu$, \\ \end{center} using the DELPHI...

Tuning and Test of Fragmentation Models Based on Identified Particles and Precision Event Shape Data (1996)

Abreu, P, Adam, W, Adye, T, Ajinenko, I, Alekseev, G D, Alemany, R, ...

Event shape and charged particle inclusive distributions are measured using 750000 decays of the $Z$ to hadrons from the DELPHI detector at LEP. These precise data allow a decisive confrontation with...

Search for neutralinos, scalar leptons and scalar quarks in $e^+ e^-$ interactions at $\sqrt{s}$=130 GeV and 136 GeV (1996)

Abreu, P, Adam, W, Adye, T, Agasi, E, Ajinenko, I, Alekseev, G D, ...

Using data accumulated by DELPHI during the November 1995 LEP run at 130~GeV -- 136~GeV, searches have been made for events with jets or leptons in conjunction with missing momentum. The results are...

Search for the lightest chargino at \Sqrt s = 130 and 136 GeV in DELPHI (1996)

Abreu, P, Adam, W, Adye, T, Agasi, E, Ajinenko, I, Aleksan, Roy, ...

A search for pair production of the lightest chargino at $\rs=$ 130.4 and 136.3~GeV has been carried out using the data sample corresponding to the 5.92~${\rm pb}^{-1}$ recorded by the DELPHI...

Search for high mass $\gamma\gamma$ resonances in e+e- --> l$^{+}$l$^{-}\gamma\gamma$, $\nu\overline{\nu}\gamma\gamma$ and q$\overline{q}\gamma\gamma$ at LEP I (1996)

Abreu, P, Adam, W, Adye, T, Agasi, E, Ajinenko, I, Aleksan, Roy, ...

A search for high mass photon pairs from the processes ${\mathrm e}^+ {\mathrm e}^- \to \ell^+ \ell^- \gamma \gamma\ $, ${\mathrm e}^+ {\mathrm e}^- \to {\mathrm \nu} \overline {\mathrm \nu} \gamma...

Study of rare b decays with the DELPHI detector at LEP (1996)

Adam, W, Adye, T, Agasi, E, Ajinenko, I, Aleksan, Roy, Alekseev, G D, ...

Rare decays of beauty particles were studied in several charmless modes using the data collected with the DELPHI detector at LEP from 1991 to 1994. These decays are mediated by both tree level $b...

Search for anomalous production of single photons at \Sqrt s = 130 and 136 GeV (1996)

Adam, W, Adye, T, Agasi, E, Ajinenko, I, Aleksan, Roy, Alekseev, G D, ...

This letter reports the results of the measurement of single photon production in the reaction $e^+e^- \rightarrow \gamma +$ invisible particles at centre-of-mass energies $\sqrt{s}=$~130 and 136 GeV...

Study of radiative leptonic events with hard photons and search for excited charged leptons at \Sqrt s = 130-136 GeV (1996)

Abreu, P, Adam, W, Adye, T, Agasi, E, Aleksan, Roy, Alekseev, G D, ...

During the last 1995 data acquisition period at LEP, the DELPHI experiment collected an integrated luminosity of $5.9$ pb$^{-1}$ at centre-of-mass energies of 130 GeV and 136 GeV. Radiative leptonic...

Kaon Interference in the Hadronic Decays of the $Z^{0}$ (1996)

Abreu, P, Adam, W, Adye, T, Agasi, E, Aleksan, Roy, Alekseev, G D, ...

The first measurement of like-sign charged kaon correlations in hadronic decays of the Z$^0$ is presented, based on data collected by the DELPHI detector. The charged kaons are identified by means of...

Mean lifetime of the B$_{s}^{0}$ meson (1996)

Abreu, P, Adam, W, Adye, T, Agasi, E, Ajinenko, I, Aleksan, Roy, ...

This paper presents an update of the measurement of the mean lifetime of the B^0_s meson. Combining D_s - \ell, D_s-h, \phi - \ell and inclusive D_s final states from the 3.2 million hadronic \Zz...

First measurement of f'$_{2}$(1525) production in Z$^{0}$ hadronic decays (1996)

Abreu, P, Adam, W, Adye, T, Agasi, E, Ajinenko, I, Aleksan, Roy, ...

\newcommand{\zz}{Z^{0}} Inclusive production of the f'_{2}(1525) in hadronic \zz\ decays has been studied in data collected by the DELPHI detector at LEP. The Ring Imaging Cherenkov detectors were...

Determination of the average lifetime of b-baryons (1996)

Abreu, P, Adam, W, Adye, T, Agasi, E, Ajinenko, I, Aleksan, Roy, ...

The average lifetime of b-baryons has been studied using 3 \times 10^6 hadronic Z^0 decays collected by the DELPHI detector at LEP. Three methods have been used, based on the measurement of different...

Search for exclusive decays of the $\Lambda_{b}$ baryon and measurement of its mass (1996)

Abreu, P, Adam, W, Adye, T, Agasi, E, Ajinenko, I, Aleksan, Roy, ...

A search for fully reconstructed \lb beauty baryons is performed using about 3 million Z decays collected with the DELPHI detector at LEP. The analysis relies on the combined use of the accurate...

Measurement of the partial decay width R$_{b}^{0}$ = $\Gamma_{b\overline{b}}$/$\Gamma_{had}$ of the Z with the DELPHI detector at LEP (1996)

Abreu, P, Adam, W, Adye, T, Agasi, E, Ajinenko, I, Aleksan, Roy, ...

The partial decay width of the Z to b\overline{ b} quark pairs has been measured by the DELPHI detector at LEP. B-hadrons, containing b-quarks, were tagged by several methods using tracks with large...

Updated precision measurement of the average lifetime of B hadrons (1996)

Abreu, P, Adam, W, Adye, T, Agasi, E, Ajinenko, I, Aleksan, Roy, ...

The measurement of the average lifetime of B hadrons using inclusively reconstructed secondary vertices has been updated using both an improved processing of previous data and additional statistics...

Production of $\Sigma^{0}$ and $\Omega^{-}$ in Z decays (1996)

Adam, W, Adye, T, Agasi, E, Ajinenko, I, Aleksan, Roy, Alekseev, G D, ...

Reconstructed \lam\ baryon decays and photon conversions in DELPHI are used to measure the \sig\ production rate from hadronic Z^0 decays at LEP. The number of \sig\ decays per hadronic Z decay is...

Determination of |V$_{cb}$| from the semileptonic decay B$^{0}$ --> D$*^{-}$l$^{+}\nu$ (1996)

Abreu, P, Adam, W, Adye, T, Agasi, E, Ajinenko, I, Aleksan, Roy, ...

Semileptonic decays B \rightarrow D^{*-} \ell^+ \nu X were selected from a sample of 3.1 million hadronic Z decays collected by the DELPHI detector at LEP. A topological search for semileptonic B...

Performance of the DELPHI detector (1996)

Abreu, P, Adam, W, Adye, T, Agasi, E, Ajinenko, I, Aleksan, Roy, ...

DELPHI (DEtector with Lepton, Photon and Hadron Identification) is a detector for e^+e^- physics, designed to provide high granularity over a 4\pi solid angle, allowing an effective particle...

Charged particle multiplicity in e+e- interactions at \Sqrt s = 130 GeV (1996)

Abreu, P, Adam, W, Adye, T, Agasi, E, Ajinenko, I, Aleksan, Roy, ...

From the data collected by DELPHI at LEP in autumn 1995, the multiplicity of charged particles at a hadronic energy of 130 GeV has been measured to be = 23.84 \pm 0.51 (stat) \pm 0.52 (syst). When...

Search for new phenomena using single photon events in the DELPHI detector at LEP (1996)

Abreu, P, Adam, W, Adye, T, Agasi, E, Ajinenko, I, Aleksan, Roy, ...

Data are presented on the reaction \epem~\into~\gamma + no other detected particle at center-of-mass energies, \sqs = 89.48 GeV, 91.26 GeV and 93.08 GeV. The cross section for this reaction is...

Energy dependence of the differences between the quark and gluon jet fragmentation (1995)

Abreu, P, Adam, W, Adye, T, Agasi, E, Ajinenko, I, Aleksan, Roy, ...

Three jet events arising from decays of the Z boson, collected by the DELPHI detector, were used to measure differences in quark and gluon fragmentation. Gluon jets were anti-tagged by identifying b...

A precise measurement of the $\tau$ lepton lifetime (1995)

Abreu, P, Adam, W, Adye, T, Agasi, E, Ajinenko, I, Aleksan, Roy, ...

The tau lepton lifetime has been measured using three different methods with the DELPHI detector. Two measurements of one-prong decays are combined, accounting for correlations, giving a result of...

Search for promptly produced heavy quarkonium states in hadronic Z decays (1995)

Abreu, P, Adam, W, Adye, T, Agasi, E, Ajinenko, I, Aleksan, Roy, ...

A search has been made for direct production of heavy quarkonium states in more than 3 million hadronic Z^{0} decays in the 1991-1994 DELPHI data. Prompt J/\psi, \psi(2S) and \Upsilon candidates have...

Measurement of inclusive $\pi^{0}$ production in hadronic $Z^{0}$ decays (1995)

Adam, W, Adye, T, Agasi, E, Ajinenko, I, Aleksan, Roy, Alekseev, G D, ...

An analysis is presented of inclusive \pi^0 production in Z^0 decays measured with the DELPHI detector. At low energies, \pi^0 decays are reconstructed by \linebreak using pairs of converted photons...

Measurement of $\Delta^{++}$(1232) production in hadronic Z decays (1995)

Abreu, P, Adam, W, Adye, T, Agasi, E, Ajinenko, I, Aleksan, Roy, ...

A measurement of the \Delta^{++}(1232) inclusive production in hadronic decays of the Z at LEP is presented, based on 1.3 million hadronic events collected~ by the DELPHI~ detector in the 1994 LEP...

A measurement of the $\tau$ leptonic branching fractions (1995)

Abreu, P, Adam, W, Adye, T, Agasi, E, Ajinenko, I, Aleksan, Roy, ...

A sample of 25000 \Z\rightarrow\tt events collected by the DELPHI experiment at LEP in 1991 and 1992 is used to measure the leptonic branching fractions of the \tau lepton. The results are B(\TEL) =...

Upper limits on the branching ratios $\tau$ --> $\mu\gamma$ and $\tau$ --> e$\gamma$ (1995)

Abreu, P, Adam, W, Adye, T, Agasi, E, Ajinenko, I, Aleksan, Roy, ...

The DELPHI collaboration has searched for lepton flavour violating decays \tau \rightarrow \mu \gamma and \tau \rightarrow e \gamma using a data sample of about 70~pb^{-1} of integrated luminosity...

Study of Prompt Photon Production in Hadronic $Z^{0}$ Decays (1995)

Abreu, P, Adam, W, Adye, T, Agasi, E, Ajinenko, I, Aleksan, Roy, ...

From a sample of 1.5 million \zqq decays collected by the DELPHI detector during 1991, 1992 and 1993, the production cross section for isolated final state photons is measured and is compared with...

Search for exclusive charmless B meson decays with the DELPHI detector at LEP (1995)

Abreu, P, Adam, W, Adye, T, Agasi, E, Ajinenko, I, Aleksan, Roy, ...

Charmless hadronic decays of beauty mesons have been searched for using the data collected with the DELPHI detector at the LEP collider. Several two, three and four-body decay modes have been...

A measurement of the photon structure function F$_{2}^{\gamma}$ at an average Q$^{2}$ of 12 GeV$^{2}$/c$^{4}$ : results from DELPHI (1995)

Abreu, P, Adam, W, Adye, T, Agasi, E, Ajinenko, I, Aleksan, Roy, ...

The hadronic photon structure function F_{2}^{\gamma} has been measured in the Q^{2} range from 4 to 30~GeV^2/c^{4} and down to x values of order 0.001, using data taken with the DELPHI detector at...

Observation of short range three-particle correlations in e+e- annihilations at LEP energies (1995)

Abreu, P, Adam, W, Adye, T, Agasi, E, Ajinenko, I, Aleksan, Roy, ...

\def\tpc{three-particle correlation} \def\twopc{two-particle correlation} Measurements are presented of short range three-particle correlations in e^+ e^- annihilations at LEP using data collected by...

Lifetimes of charged and neutral B hadrons using event topology (1995)

Adam, W, Adye, T, Agasi, E, Ajinenko, I, Aleksan, Roy, Alekseev, G D, ...

The lifetimes of charged and neutral B hadrons have been measured using data collected by the DELPHI experiment at LEP between 1991 and 1993. B hadrons are tagged as jets with a secondary vertex and...

A measurement of B$^{+}$ and B$^{0}$ lifetimes using $\overline{D}$l$^{+}$ events (1995)

Abreu, P, Adam, W, Adye, T, Agasi, E, Ajinenko, I, Aleksan, Roy, ...

A measurement of B meson lifetimes is presented using data collected from 1991 to 1993 by the DELPHI detector at the LEP collider. Samples of events with a D meson and a lepton in the same jet are...

Lifetime and production rate of beauty baryons from Z decays (1995)

Abreu, P, Adam, W, Adye, T, Agasi, E, Ajinenko, I, Aleksan, Roy, ...

The production and decay of beauty baryons (b-baryons) have been studied using 1.7 \times 10^6 Z hadronic decays collected by the DELPHI detector at LEP. Three different techniques were used to...

Strange baryon production in Z hadronic decays (1995)

Abreu, P, Adam, W, Adye, T, Agasi, E, Ajinenko, I, Aleksan, Roy, ...

A study of the production of strange octet and decuplet baryons in hadronic decays of the Z recorded by the DELPHI detector at LEP is presented. This includes the first measurement of the \Sigma^\pm...