Reach of future colliders in probing the structure of the photon

Abstract

A comparison of the potentials of ep and e+e-$machines to probe the structure of the photon is performed. In particular, the kinematic reach of a proposed future ep facility, THERA, is compared with those of current colliders, LEP and HERA, and with the proposed linear collider, TESLA. THERA like HERA will use a proton beam of 920 GeV but with an increased electron beam energy of 250 GeV allowing higher scales, Q2, and lower values of parton momentum fraction in the photon, xγ, to be probed.

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