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Sudakov effects in photon-initiated processes.

Harland-Lang, L.A. and Khoze, V.A. and Ryskin, M.G. (2016) 'Sudakov effects in photon-initiated processes.', Physics letters B., 761 . pp. 20-24.


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.

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Publisher statement:© 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license ( Funded by SCOAP3.
Date accepted:02 August 2016
Date deposited:18 April 2019
Date of first online publication:05 August 2016
Date first made open access:18 April 2019

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