https://doi.org/10.1140/epjc/s10052-019-7296-0
Regular Article - Theoretical Physics
Ad Lucem: QED parton distribution functions in the MMHT framework
1
Rudolf Peierls Centre, Beecroft Building, Parks Road, Oxford, OX1 3PU, UK
2
Institute for Particle Physics Phenomenology, University of Durham, Durham, DH1 3LE, UK
3
Department of Physics and Astronomy, University College London, WC1E 6BT, London, UK
* e-mail: robert.thorne@ucl.ac.uk
Received:
17
July
2019
Accepted:
2
September
2019
Published online:
1
October
2019
We present the MMHT2015qed PDF set, resulting from the inclusion of QED corrections to the existing set of MMHT Parton Distribution Functions (PDFs), and which contain the photon PDF of the proton. Adopting an input distribution from the LUXqed formulation, we discuss our methods of including QED effects for the full, coupled DGLAP evolution of all partons with QED at 
, 
, 
. While we find consistency for the photon PDF of the proton with other recent sets, building on this we also present a set of QED corrected neutron PDFs and provide the photon PDF separated into its elastic and inelastic contributions. The effect of QED corrections on the other partons and the fit quality is investigated, and the sources of uncertainty for the photon are outlined. Finally we explore the phenomenological implications of this set, giving the partonic luminosities for both the elastic and inelastic contributions to the photon and the effect of our photon PDF on fits to high mass Drell–Yan production, including the photon-initiated channel.
© The Author(s), 2019
