New Parton Distribution Functions for the Photon

Abstract

We present new improved parton distributions for the photon. We fit {\bf all} available data on the photon structure function, $F_2^{\gamma }(x,Q^2)$, with $Q^2\ge 3$ GeV${}^2$, in order to determine the quark distributions. We also pay particular attention to the gluon distribution in the photon, $g^{\gamma }(x,Q^2)$, which has been poorly constrained in earlier analyses which only include structure function data. We use large $p_T$ jet production in $\gamma \gamma$ collisions from TRISTAN to constrain $g^{\gamma }$. We also see what information can be gleaned from $\gamma p$ collisions at HERA on $g^{\gamma }$ and on the quark distributions at large $x$, where there are no structure function data. We review future prospects of elucidating the parton distributions of the photon.

33 pages, 8 figures, uses epsf

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Cited by in corpus (34)

• Testing the Universality of Fragmentation Functions
• HERA Collider Physics
• Theory of hard photoproduction
• The Photon Structure from Deep Inelastic Electron-Photon Scattering
• Radiatively Generated Parton Distributions of Real and Virtual Photons
• Constraining Gluon Shadowing Using Photoproduction in Ultraperipheral pA and AA Collisions
• Survey of present data on photon structure functions and resolved photon processes
• Measurement of inclusive prompt photon photoproduction at HERA
• Jet angularities in photoproduction at the Electron-Ion Collider
• Photoproduction of jets at HERA in next-to-leading order QCD
• Strong Coupling Constant from the Photon Structure Function
• Observation of Isolated High-ET Photons in Photoproduction at HERA
• Next-to-next-to-leading order QCD corrections to the photon's parton structure
• D* Production in Two-Photon Collisions
• Hard diffraction in photoproduction with Pythia 8
• Di-Jet Production in Photon-Photon colisions at sqrt(s)ee from 189 to 209 GeV
• NLO photon parton parametrization using ee and ep data
• The Q^2 Dependence of Dijet Cross Sections in gamma p Interactions at HERA
• Photoproduction of the isolated photon at HERA in NLO QCD
• Photon structure studied at an Electron Ion Collider
• Prompt Photon Plus Jet Photoproduction at HERA at Next-to-Leading Order in QCD
• Photoproduction of Jets on a Virtual Pion Target in Next-to-Leading Order QCD
• Jet photoproduction and the structure of the photon
• Measurement of Inclusive $D^{\ast \pm }$ Production in Two-Photon Collisions at LEP
• Double Diffraction Dissociation at High t
• Real photon structure at an e^+e^- linear collider
• Factorization Breaking in Dijet Photoproduction with a Leading Neutron
• The pion structure function and jet production in $\gamma p\to nX$
• Photoproduction of isolated photons at HERA in NLO QCD
• Two-Photon Processes and Photon Structure
• Structure of Real and Virtual Photons from ZEUS
• Prompt photon processes in photoproduction at HERA
• Jet and hadron production in photon-photon collisions
• Inclusive hard processes in photon-photon and photon-proton interactions