Measurement of Photon Production in the Very Forward Direction in Deep-Inelastic Scattering at HERA

Details Measurement of Photon Production in the Very Forward Direction in Deep-Inelastic Scattering at HERA Measurement of Photon Production in the Very Forward Direction in Deep-Inelastic Scattering at HERA

2011-06-29

arxiv.org/abs/1106.5944v1

Physics

High Energy Physics

High Energy Physics - Experiment

19 pages, 6 figures and 2 tables

Scientific paper

The production of photons at very small angles with respect to the proton beam direction is studied in deep-inelastic positron-proton scattering at HERA. The data are taken with the H1 detector in the years 2006 and 2007 and correspond to an integrated luminosity of $126 \mathrm{pb}^{-1}$. The analysis covers the range of negative four momentum transfer squared at the positron vertex $67.9$ as a function of its transverse momentum $p_T^{lead}$ and longitudinal momentum fraction of the incoming proton $x_L^{lead}$. In addition, the cross sections are studied as a function of the sum of the longitudinal momentum fraction $x_L^{sum}$ of all photons in the pseudorapidity range $\eta>7.9$. The cross sections are normalised to the inclusive deep-inelastic scattering cross section and compared to the predictions of models of deep-inelastic scattering and models of the hadronic interactions of high energy cosmic rays.

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