Reach of future colliders in probing the structure of the photon
M. Krawczyk (University of Warsaw), S. Soldner-Rembold (CERN), M. Wing, (McGill University)

TL;DR
This paper compares the capabilities of future and current colliders in exploring the photon’s structure, highlighting how a proposed ep collider, THERA, could extend the kinematic reach beyond existing facilities.
Contribution
It provides a comparative analysis of the potential of various colliders, especially THERA, to probe the photon structure at higher energy scales and lower parton momentum fractions.
Findings
THERA can probe higher Q^2 scales than HERA and LEP.
THERA extends the x_gamma range to lower values.
Future colliders offer enhanced sensitivity to photon structure.
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, Q^2, and lower values of parton momentum fraction in the photon, x_\gamma, to be probed.
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