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Sudakov effects in photon-initiated processes

Harland-Lang, LA; Khoze, VA; Ryskin, MG; (2016) Sudakov effects in photon-initiated processes. Physics Letters B , 761 (C) pp. 20-24. 10.1016/j.physletb.2016.08.004. Green open access

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Abstract

We consider the effect of the Sudakov factor in photon-initiated processes, corresponding to the no branching probability for the initial-state photon. We demonstrate how such a factor follows simply from the solution of the DGLAP equation for the photon PDF, and is therefore included automatically by this. We use this result to argue that the appropriate scale for the QED coupling α associated with an initial-state photon is not the virtuality of the photon, but rather the factorization scale at which the photon PDF is evaluated, and therefore that the use of the on-shell renormalization scheme is not appropriate for such processes. We also discuss exclusive photon-initiated processes, and demonstrate that no explicit Sudakov factor is required in this case.

Type: Article
Title: Sudakov effects in photon-initiated processes
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.physletb.2016.08.004
Publisher version: http://dx.doi.org/10.1016/j.physletb.2016.08.004
Additional information: Copyright © 2017 Elsevier B.V. or its licensors or contributors. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/1542447
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