THE SINGLE JET INCLUSIVE CROSS-SECTION IN GAMMA-GAMMA PROCESSES AT E-COLLIDERS AS A MEANS OF MEASURING THE GLUON DISTRIBUTION OF THE PHOTON(E)

We examine the possibility of using the single jet inclusive cross sec tion in gammagamma processes at e+e- colliders such as TRISTAN and LEP in order to get reliable measurements of the parton distributions of the photon and in particular of the gluon distribution. We find that i f it is possible to tag the two spectator jet fragments from the two p hotons, and thereby reliably identifying the double resolved contribut ion to the cross section, then unambiguous measurement of the gluon co ntent of the photon is possible if, in addition, it is assumed that th e quark distributions are reliably known. An O(alpha(s)3) next-to-lead ing order calculation of this contribution, which is very much less se nsitive to renormalisation/factorisation scale uncertainties, is perfo rmed which reinforces this conclusion.