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arxiv: 0909.4223 · v2 · pith:NBB4WJUMnew · submitted 2009-09-23 · ✦ hep-ex

Measurement of isolated photon production in deep inelastic ep scattering

classification ✦ hep-ex
keywords photonisolatedproductiondeepinelasticrangescatteringbeen
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Isolated photon production in deep inelastic ep scattering has been measured with the ZEUS detector at HERA using an integrated luminosity of 320pb^-1. Measurements were made in the isolated-photon transverse-energy and pseudorapidity ranges 4 < E_T < 15 GeV and -0.7 < eta < 0.9 for exchanged photon virtualities, Q^2, in the range 10 < Q^2 < 350 GeV and for invariant masses of the hadronic system W_X> 5 GeV. Differential cross sections are presented for inclusive isolated photon production as functions of Q^2, x, E_T and eta. Leading-logarithm parton-shower Monte Carlo simulations and perturbative QCD predictions give a reasonable description of the data over most of the kinematic range.

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