Abstract

The photon structure function F2γ has been measured at average Q2 values of 73 and 390 GeV2 using data collected by the AMY detector at the TRISTAN e+e− collider. F2γ is observed to be increasing as ln Q2. The x-dependence of F2γ, where x is the momentum fraction carried by the parton inside the photon, is also measured. The measurements are compared with several parton density models.