Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-07-18
Nucl.Phys.B489:405-426,1997
Physics
High Energy Physics
High Energy Physics - Phenomenology
33 pages, 8 figures, uses epsf
Scientific paper
10.1016/S0550-3213(97)00048-5
We present new improved parton distributions for the photon. We fit {\bf all} available data on the photon structure function, $F^{\gamma}_{2}(x,Q^2)$, 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.
Gordon Lionel E.
Storrow J. K.
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