Study of gluon versus quark fragmentation in $Υ \to gg γ$ and $e^{+} e^{-} \to q \bar{q} γ$ events at $\sqrt{s}$ =10 GeV

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1 July 1997

journal article
research article
Published by American Physical Society (APS) in Physical Review D

Vol. 56 (1) , 17-22
https://doi.org/10.1103/physrevd.56.17

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

Υ (1 S) \to gg γ

events,

〈 n_{gluon}^{\pm} 〉

, to the mean charged multiplicity observed in

e^{+} e^{-} \to q \bar{q} γ

events,

〈 n_{quark}^{\pm} 〉

. We find

R_{chrg} \equiv 〈 n_{gluon}^{\pm} 〉 / 〈 n_{quark}^{\pm} 〉 = 1.04

\pm 0.02 (stat) \pm 0.05 (syst)

for jet-jet masses less than 7 GeV.

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