CERN Accelerating science

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1.
Measurement of $\Lambda$ polarization from Z decays / ALEPH Collaboration
The polarization of \Lambda baryons from Z decays is studied with the {\sc Aleph} apparatus. Evidence of longitudinal polarization of s quarks from Z decay is observed for the first time [...]
CERN-PPE-96-004; FSU-SCRI-96-104.- Geneva : CERN, 1996 - 16 p. ALEPH Papers - Published in : Phys. Lett. B 374 (1996) 319-330 Fulltext: PDF;
In : 28th International Conference on High-energy Physics, Warsaw, Poland, 25 - 31 Jul 1996, pp.PA01-072 - CERN library copies
2.
Quark and gluon jet properties in symmetric three-jet events / ALEPH Collaboration
Quark and gluon jets with the same energy, 24GeV, are compared in symmetric three-jet configurations from hadronic Z decays observed by the ALEPH detector. Jets are defined using the Durham algorithm. [...]
CERN-PPE-95-184; FSU-SCRI-96-140.- Geneva : CERN, 1996 - 13 p. ALEPH Papers - Published in : Phys. Lett. B 384 (1996) 353-364 Fulltext: PDF;
In : 28th International Conference on High-energy Physics, Warsaw, Poland, 25 - 31 Jul 1996, pp.PA04-065 - CERN library copies
3.
Measurement of $\Lambda_{b}$ polarization in Z decays / ALEPH Collaboration
The \Lambda_{\mathrm{b}} polarization in hadronic \mathrm{Z} decays is measured in semileptonic decays from the average energies of the charged lepton and the neutrino. In a data sample of approximately 3 million hadronic \mathrm{Z} decays collected by the ALEPH detector at LEP between 1991 and 1994, 462\pm 31 \Lambda_{\mathrm{b}} candidates are selected using (\Lambda \pi^+)--lepton correlations. [...]
CERN-PPE-95-156; FSU-SCRI-96-19.- Geneva : CERN, 1996 - 17 p. ALEPH Papers - Published in : Phys. Lett. B 365 (1996) 437-447 Fulltext: PDF; - CERN library copies
4.
Tau hadronic branching ratios / ALEPH Collaboration
From 64492 selected \tau-pair events, produced at the Z^0 resonance, the measurement of the tau decays into hadrons from a global analysis using 1991, 1992 and 1993 ALEPH data is presented. Special emphasis is given to the reconstruction of photons and \pi^0's, and the removal of fake photons [...]
CERN-PPE-95-140; FSU-SCRI-96-65.- Geneva : CERN, 1996 - 67 p. ALEPH Papers - Published in : Z. Phys. C 70 (1996) 579-608 Fulltext: PDF; - CERN library copies
5.
Measurement of the B$^{0}_{s}$ lifetime and production rate with D$^{-}_{s}$ l$^{+}$ combinations in Z decays / ALEPH Collaboration
The lifetime of the \bs meson is measured in approximately 3 million hadronic Z decays accumulated using the ALEPH detector at LEP from 1991 to 1994. Seven different \ds decay modes were reconstructed and combined with an opposite sign lepton as evidence of semileptonic \bs decays. [...]
CERN-PPE-95-125; FSU-SCRI-95-122.- Tallahassee, FL : Florida State Univ., 1995 - 15 p. ALEPH Papers - Published in : Phys. Lett. B 361 (1995) 221-233 Fulltext: PDF; - CERN library copies
6.
Tau leptonic branching ratios / ALEPH Collaboration
A sample of 62249 \tau-pair events is selected from data taken with the ALEPH detector in 1991, 1992 and 1993. The measurement of the branching fractions for \tau decays into electrons and muons is presented with emphasis on the study of systematic effects from selection, particle identification and decay classification. [...]
CERN-PPE-95-127; FSU-SCRI-96-64.- Geneva : CERN, 1996 - 39 p. ALEPH Papers - Published in : Z. Phys. C 70 (1996) 561-578 Fulltext: PDF; - CERN library copies
7.
Measurement of the $\tau$ lepton lifetime / ALEPH Collaboration
The mean lifetime of the \tau lepton is measured in a sample of 25700 \tau pairs collected in 1992 with the ALEPH detector at LEP. A new analysis of the 1-1 topology events is introduced. [...]
CERN-PPE-95-128; FSU-SCRI-96-63.- Geneva : CERN, 1996 - 18 p. ALEPH Papers - Published in : Z. Phys. C 70 (1996) 549-560 Fulltext: PDF; - CERN library copies
8.
A precise measurement of the average b hadron lifetime / ALEPH Collaboration
An improved measurement of the average b hadron lifetime is performed using a sample of 1.5 million hadronic Z decays, collected during the 1991-1993 runs of ALEPH, with the silicon vertex detector fully operational. This uses the three-dimensional impact parameter distribution of lepton tracks coming from semileptonic b decays and yields an average b hadron lifetime of 1.533 \pm 0.013 \pm 0.022 ps..
CERN-PPE-95-121.- Geneva : CERN, 1996 - 13 p. ALEPH Papers - Published in : Phys. Lett. B 369 (1996) 151-162 Fulltext: PDF; - CERN library copies
9.
Production of excited beauty states in Z decays / ALEPH Collaboration
A data sample of about 3.0 million hadronic Z decays collected by the ALEPH experiment at LEP in the years 1991 through 1994, is used to make an inclusive selection of B~hadron events. In this event sample 4227 \pm 140 \pm 252 B^* mesons in the decay B^* \to B \gamma and 1944 \pm 108 \pm 161 B^{**} mesons decaying into a B~meson and a charged pion are reconstructed. [...]
CERN-PPE-95-108; FSU-SCRI-96-16.- Geneva : CERN, 1996 - 24 p. ALEPH Papers - Published in : Z. Phys. C 69 (1996) 393-404 Fulltext: PDF; - CERN library copies
10.
Measurements of the charged particle multiplicity distribution in restricted rapidity intervals / ALEPH Collaboration
Charged particle multiplicity distributions have been measured with the ALEPH detector in restricted rapidity intervals |Y| \leq 0.5,1.0, 1.5,2.0\/ along the thrust axis and also without restriction on rapidity. The distribution for the full range can be parametrized by a log-normal distribution. [...]
CERN-PPE-95-82; FSU-SCRI-95-123.- Tallahassee, FL : Florida State Univ., 1995 - 14 p. ALEPH Papers - Published in : Z. Phys. C 69 (1995) 15-25 Fulltext: PDF; - CERN library copies

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