Author/Authors :
DELPHI Collaboration، نويسنده , , P Abreu، نويسنده , , W Adam، نويسنده , , T Adye، نويسنده , , I Ajinenko، نويسنده , , G.D. Alekseev، نويسنده , , R Alemany، نويسنده , , P.P. Allport، نويسنده , , S. Almehed، نويسنده , , U Amaldi، نويسنده , , S Amato، نويسنده , , P Andersson، نويسنده , , A Andreazza، نويسنده , , P. Antilogus، نويسنده , , W-D Apel، نويسنده , , Y Arnoud، نويسنده , , B ?sman، نويسنده , , J-E Augustin، نويسنده , , A Augustinus، نويسنده , , P Baillon، نويسنده , , et al.، نويسنده ,
Abstract :
The data collected by DELPHI in 1996 have been used to measure the average charged particle multiplicities and dispersions in qq̄ 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 qq̄ 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 Wʹs at the present level of statistics.
