Sudakov effects in photon-initiated processes

Harland-Lang, L.A.; Khoze, V.A.; Ryskin, M.G.

doi:10.1016/j.physletb.2016.08.004

Sudakov effects in photon-initiated processes

Harland-Lang, L.A.; Khoze, V.A.; Ryskin, M.G.

Authors

L.A. Harland-Lang

V.A. Khoze

M.G. Ryskin

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.

Citation

Harland-Lang, L., Khoze, V., & Ryskin, M. (2016). Sudakov effects in photon-initiated processes. Physics Letters B, 761, 20-24. https://doi.org/10.1016/j.physletb.2016.08.004

Journal Article Type	Article
Acceptance Date	Aug 2, 2016
Online Publication Date	Aug 5, 2016
Publication Date	Oct 10, 2016
Deposit Date	Apr 18, 2019
Publicly Available Date	Apr 18, 2019
Journal	Physics Letters B
Print ISSN	0370-2693
Publisher	Elsevier
Peer Reviewed	Peer Reviewed
Volume	761
Pages	20-24
DOI	https://doi.org/10.1016/j.physletb.2016.08.004

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Copyright Statement
© 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP3.