Parton distributions in the photon from ${\gamma }^{\ast }\gamma$ and ${\gamma }^{\ast }p$ scattering

H. Abramowicz, E. Gurvich, A. Levy

Leading order parton distributions in the photon are extracted from the existing $F_2^{\gamma }$ measurements and the low-$x$ proton structure function. The latter is related to the photon…