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Comparison of the Particle Flow in $q \bar{q} \gamma$ and $q \bar{q} g$ Events From $e^+ e^-$ Annihilations at {PETRA}

The JADE collaboration Saada, F.Ould ; Allison, J. ; Ambrus, K. ; et al.

Z.Phys.C 39 (1988) 1, 1988.

Inspire Record 260834 DOI 10.17182/hepdata.15623

The particle flow distributions in the event plane of 3-jet$(e^ +e^ -\to q\bar qg)$ and of radiative 2-jet$(e^ +e^ -\to q\bar q\gamma )$ events are compared at a centre of mass energy of 35 GeV. The number of particles in the angular region opposite to the gluon in$q\bar qg$ events is found to be significantly reduced relative to the number of particles in the region opposite to the hard photon in$q\bar q\gamma $ events. This depletion is expected from the “string effect” observed in 3-jet events. It can be explained within the framework of QCD as arising from soft gluon interference.

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Comparison of the Particle Flow in $q \bar{q} \gamma$ and $q \bar{q} g$ Events From $e^+ e^-$ Annihilations at {PETRA}