Dijet angular distributions in direct and resolved photoproduction at HERA
Journal
Physics Letters
Journal Volume
B384
Pages
401-413
Date Issued
1996-05
Author(s)
Derrick, M. et al.(ZEUS Collaboration)
Abstract
Jet photoproduction, where the two highest transverse energy (ET jet) jets have ET jet 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.
SDGs
Type
journal article