The photon PDF of the proton

Abstract

We show how the photon input parton distribution function (PDF) may be calculated with good accuracy, and used in an extended DGLAP global parton analysis in which the photon is treated as an additional point-like parton. The uncertainty of the input photon PDF is relatively small, since the major part of the distribution (which is produced by the coherent emission of the photon from a proton that remains intact) is well known. We present the expected photon PDFs, and compare the predictions with ZEUS data for isolated photon electroproduction at negative rapidities.

11 pages, 6 figures, 3 tables

References in corpus (3)

• Parton distributions for the LHC
• Extended Parameterisations for MSTW PDFs and their effect on Lepton Charge Asymmetry from W Decays
• Measuring the Photon Fragmentation Function at HERA

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• Constraining the photon flux in two-photon processes at the LHC
• Probing the photon flux in the diffractive quarkonium photoproduction at LHC
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• Validity of equivalent photon spectra and the photoproduction processes in p-p collisions