Journal article
Charged multiplicities in Z decays into u, d, and s Quarks
G Abbiendi, C Ainsley, PF Åkesson, G Alexander, J Allison, G Anagnostou, KJ Anderson, S Arcelli, S Asai, D Axen, G Azuelos, I Bailey, AH Ball, E Barberio, RJ Barlow, T Behnke, KW Bell, G Bella, A Bellerive, G Benelli Show all
European Physical Journal C | SPRINGER | Published : 2001
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 √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 〈nu〉 = 17.77 ± 0.51 +0.86-1.20, 〈nd〉 = 21.44 ± 0.63 +1.46-1.17, 〈ns〉 = 20.02 ± 0.13 +0.39-0.37, where statistical ar..
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