Charged Particle Multiplicity In E(+)E(-)-> Q(Q)Over-Bar Events At 161 And 172 Gev And From The Decay Of The W Boson

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PHYSICS LETTERS B（1998）

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摘要

The data collected by DELPHI in 1996 have been used to measure the average charged particle multiplicities and dispersions in q (q) over bar events at centre-of-mass energies of root s = 161 GeV and root s = 172 GeV, and the average charge multiplicity in WW events at root s = 172 GeV. The multiplicities in q (q) over bar 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. (C) 1998 Elsevier Science B.V.

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