Observation of hard scattering in photoproduction events with a large rapidity gap at HERA

Details Observation of hard scattering in photoproduction events with a large rapidity gap at HERA Observation of hard scattering in photoproduction events with a large rapidity gap at HERA

1995-01-25

arxiv.org/abs/hep-ex/9501011v1

Phys.Lett.B346:399-414,1995

Physics

High Energy Physics

High Energy Physics - Experiment

19 pages, latex, 4 figures appended as uuencoded file

Scientific paper

10.1016/0370-2693(95)00022-D

Events with a large rapidity gap and total transverse energy greater than 5 GeV have been observed in quasi-real photoproduction at HERA with the ZEUS detector. The distribution of these events as a function of the $\gamma p$ centre of mass energy is consistent with diffractive scattering. For total transverse energies above 12 GeV, the hadronic final states show predominantly a two-jet structure with each jet having a transverse energy greater than 4 GeV. For the two-jet events, little energy flow is found outside the jets. This observation is consistent with the hard scattering of a quasi-real photon with a colourless object in the proton.

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