Dijet Angular Distributions in Direct and Resolved Photoproduction at HERA

Details Dijet Angular Distributions in Direct and Resolved Photoproduction at HERA Dijet Angular Distributions in Direct and Resolved Photoproduction at HERA

1996-05-23

arxiv.org/abs/hep-ex/9605009v1

Phys.Lett.B384:401-413,1996

Physics

High Energy Physics

High Energy Physics - Experiment

20 pages including 4 figures

Scientific paper

10.1016/0370-2693(96)00931-8

Jet photoproduction, where the two highest transverse energy ($\ETJ$) jets have $\ETJ$ above 6 GeV and a jet-jet invariant mass above 23~GeV, has been studied with the ZEUS detector at the HERA $ep$ collider. Resolved and direct photoproduction samples have been separated. The cross section as a function of the angle between the jet-jet axis and the beam direction in the dijet rest frame has been measured for the two samples. The measured angular distributions differ markedly from each other. They agree with the predictions of QCD calculations, where the different angular distributions reflect the different spins of the quark and gluon exchanged in the hard subprocess.

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