CERN Accelerating science

Article
Report number hep-ex/0011022 ; CERN-EP-2000-128 ; CERN-EP-2000-128
Title Charged Multiplicities in Z Decays into u, d, and s Quarks
Author(s) OPAL Collaboration  Mostrar todos os 296 autores
Affiliation (CERN)
Publication 2001
Imprint 6 Nov 2000
Number of pages 24
In: Eur. Phys. J. C 19 (2001) 257-268
DOI 10.1007/s100520100611
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LEP ; OPAL
Abstract About 4.4 million hadronic decays of Z bosons, recorded by the OPAL detector at LEP at a centre-of-mass energy of around sqrt(s) = 91.2 GeV, are used to determine the mean charged particle multiplicities for the three light quark flavours. Events from primary u, d, and s quarks are tagged by selecting characteristic particles which carry a large fraction of the beam energy. The charged particle multiplicities are measured in the hemispheres opposite to these particles. An unfolding procedure is applied to obtain these multiplicities for each primary light quark flavour. This yields <n_u> = 17.77 +- 0.51 +0.86 -1.20, <n_d> = 21.44 +- 0.63 +1.46 -1.17, <n_s> = 20.02 +- 0.13 +0.39 -0.37, where statistical and systematic errors are given. The results for <n_u> and <n_d> are almost fully statistically anti-correlated. Within the errors the result is consistent with the flavour independence of the strong interaction for the particle multiplicities in events from the light up, down, and strange quarks.
Copyright/License Preprint: (License: CC-BY-4.0)

Corresponding record in: Inspire
Email contact: tatsuo.kawamoto@cern.ch


 Record created 2000-11-07, last modified 2021-10-29


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