Study of quark fragmentation in e/sup +/e/sup -/ annihilation at 29 GeV: charged particle multiplicity distributions

Conference · Tue Jan 01 04:00:00 EST 1985

OSTI ID:5173420

Derrick, M; Kooijman, P; Loos, J S; Musgrave, B; Price, L E; Schlereth, J; Sugano, K; Weiss, J M; Wood, D E; Baranko, G

This paper presents the charged particle multiplicity distributions for e/sup +/e/sup -/ annihilation at ..sqrt..s = 29 GeV measured in the High Resolution Spectrometer. The data, which correspond to an integrated luminosity of 185 pb/sup -1/, were obtained at the e/sup +/e/sup -/ storage ring PEP. The techniques used to obtain the original distributions from the observed prong numbers are discussed. The multiplicity distribution of the charged particles with a two jet selection has a mean value = 13.02 +- 0.03 +- 0.5; and a dispersion D = 3.84 +- 0.02 +- 0.1. The mean multiplicity increases with the event sphericity. No correlation is observed between the multiplicities in the two jets that characterize most of the events. For the single jets a value of D = 2.71 +- 0.02 +- 0.06 is measured which gives further support the idea of independent jet fragmentation. When compared with e/sup +/e/sup -/ data at other energies, the multiplicity distributions exhibit the scaling behavior in the mean first suggested by Koba, Nielsen and Olsen (KNO). The KNO distribution in the central rapidity interval is broader than that for the whole rapidity span and agrees well with the generalized Bose-Einstein formula for three independent sources. 17 refs., 14 figs.

• Research Organization: Argonne National Lab., IL (USA); Indiana Univ., Bloomington (USA); Michigan Univ., Ann Arbor (USA); Purdue Univ., Lafayette, IN (USA); Lawrence Berkeley Lab., CA (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5173420
• Report Number(s): ANL-HEP-CP-85-60; CONF-850819-7; ON: DE85018448
• Country of Publication: United States
• Language: English

Related Subjects

645101* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Electromagnetic Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANNIHILATION
BASIC INTERACTIONS
DATA
ELECTROMAGNETIC INTERACTIONS
ELECTRON-POSITRON INTERACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
EXPERIMENTAL DATA
FRAGMENTATION
GEV RANGE
GEV RANGE 10-100
INFORMATION
INTERACTIONS
JETS
LEPTON-LEPTON INTERACTIONS
MULTIPLICITY
NUMERICAL DATA
PARTICLE INTERACTIONS
PARTICLE PROPERTIES
PARTICLE RAPIDITY
POSTULATED PARTICLES
QUARKS
SCALING LAWS