Study of Gluon versus Quark Fragmentation in $\Upsilon\to gg\gamma$ and $e^{+}e^{-}\to q\bar{q}\gamma$ Events at \sqrt{s}=10 GeV

TL;DR

This paper compares gluon and quark fragmentation by measuring charged particle multiplicities in Upsilon and electron-positron events at 10 GeV, providing insights into hadronization processes.

Contribution

It presents the first precise measurement of the charged multiplicity ratio between gluon and quark jets at this energy, using data from the CLEO II detector.

Findings

Charged multiplicity ratio R(chrg)=1.04±0.02±0.05 for jet-jet masses < 7 GeV

Supports theoretical predictions of similar multiplicities in gluon and quark jets at this energy

Provides data for refining models of parton fragmentation

Abstract

Using data collected with the CLEO II detector at the Cornell Electron Storage Ring, we determine the ratio R(chrg) for the mean charged multiplicity observed in Upsilon(1S)->gggamma events, to the mean charged multiplicity observed in e+e- -> qqbar gamma events. We find R(chrg)=1.04+/-0.02+/-0.05 for jet-jet masses less than 7 GeV.