A measurement of the photon structure function F2γ at an average Q2 of 12 GeV2/c4

The hadronic photon structure function F2γ has been measured in the Q2 range from 4 to 30 GeV2/c4 and down to x values of order 0.001, using data taken with the DELPHI detector at LEP between 1991 and 1993. A comparison is made with several F2γ parameterizations with special emphasis on their low x behaviour. A result on the Q2 evolution of F2γ is presented. © Springer-Verlag 1996.