The photon PDF of the proton

The European Physical Journal C

A. D. Martin¹  M. G. Ryskin² 

[1] Institute for Particle Physics Phenomenology, University of Durham, DH1 3LE, Durham, UK;Institute for Particle Physics Phenomenology, University of Durham, DH1 3LE, Durham, UK;Petersburg Nuclear Physics Institute, NRC Kurchatov Institute, Gatchina, 188300, St. Petersburg, Russia;

关键词: Parton Distribution Function;    ZEUS Collaboration;    Photon Distribution;    DGLAP Evolution;    Coherent Emission;   

DOI  :  10.1140/epjc/s10052-014-3040-y

来源: Springer

【 摘 要 】

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.

【 授权许可】

CC BY