Charged particle multiplicity in e+ e- ---> q anti-q events at 161-GeV and 172-GeV and from the decay of the W boson
Collaboration
17 pages
Published in:
- Phys.Lett.B 416 (1998) 233-246
Report number:
- CERN-PPE-97-113
Experiments:
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Abstract: (Elsevier)
The data collected by DELPHI in 1996 have been used to measure the average charged particle multiplicities and dispersions in q q ̄ events at centre-of-mass energies of s =161 GeV and s =172 GeV, and the average charge multiplicity in WW events at s =172 GeV. The multiplicities in q q ̄ events are consistent with the evolution predicted by QCD. The dispersions in the multiplicity distributions are consistent with Koba-Nielsen-Olesen (KNO) scaling. The average multiplicity of charged particles in hadronic W decays has been measured for the first time; its value, 19.23±0.74(stat+syst), is consistent with that expected for an e + e − interaction at a centre-of-mass energy equal to the W mass. The charged particle multiplicity in W decays shows no evidence of effects of colour reconnection between partons from different W's at the present level of statistics.- electron positron: colliding beams
- electron positron: annihilation
- quark: pair production
- photon: radiation
- W: pair production
- W: hadronic decay
- charged particle: multiplicity
- multiplicity: moment
- quantum chromodynamics
- scaling: KNO
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