Comparison of the particle flow in $q\bar q\gamma$ and $q\bar qg$ events frome⁺e⁻ annihilations at PETRA

F. Ould Saada,J. Allison,K. Ambrus,R. J. Barlow,W. Bartel,Lore Becker,Siegfried Bethke,C. K. Bowdery,S. L. Cartwright,J T M Chrin, Donald A Clarke,A. Dieckmann,I. P. Duerdoth, G. Eckerlin,E. Elsen,R. Felst,Alexander Finch,F. Foster, T. Greenshaw,J. Hagemann,D. Haidt,J. Heintze, G. Heinzelmann,K. H. Hellenbrand,Pat Hill, George W Hughes,H. Kado,K. Kawagoe, T. Kawamoto, C. Kleinwort,G. Knies, S. Komamiya,H. Krehbiel,J. v. Krogh,M. Kuhlen,F. K. Loebinger,A. A. Macbeth,N. Magnussen, Ralph J Marshall,R. Meinke,R. P. Middleton,H. E. Mills,Makoto Minowa,P. G. Murphy,B. Naroska,J. M. Nye,J E Olsson,A. Petersen,R. Ramcke,H. Rieseberg,D. Schmidt,H Von Der Schmitt,L. Smolik,U. Schneekloth,J. A. J. Skard,J. Spitzer,P. Steffen,K. Stephens, A. Wagner,I. W. Walker,P. Warming,G. Weber,M. Zimmer,G. T. Zorn

European Physical Journal C（1988）

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摘要

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 and events frome+e− annihilations at PETRA

Comparison of the particle flow in $q\bar q\gamma$ and $q\bar qg$ events frome⁺e⁻ annihilations at PETRA