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Very energetic photons at HERA

1991; Elsevier BV; Volume: 262; Issue: 4 Linguagem: Inglês

10.1016/0370-2693(91)90628-4

1873-2445

Ahmed C. Bawa, Maria Krawczyk,

Quantum Chromodynamics and Particle Interactions

We show that very energetic photons in the backward direction can be produced in deep inelastic Compton scattering at HERA. Assuming a fixed energy of 9 GeV for the initial photons and 820 GeV for the photons a high rate is found for the production of final photons with a transverse momentum equal to 5 GeV/c and energy between 40 GeV and 300 GeV. These energetic photons arise mainly from the scattering of the soft gluonic constituents of the initial photon with quarks from the proton. They are produced in the backward direction in coincidence with a photon beam jet of energy ∼9 GeV in the forward direction.