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Illuminating the photon content of the proton within a global PDF analysis

Valerio Bertone, Stefano Carrazza, Nathan P. Hartland, Juan Rojo

SciPost Phys. 5, 008 (2018) · published 25 July 2018


Precision phenomenology at the LHC requires accounting for both higher-order QCD and electroweak corrections as well as for photon-initiated subprocesses. Building upon the recent NNPDF3.1 fit, in this work the photon content of the proton is determined within a global analysis supplemented by the LUXqed constraint relating the photon PDF to lepton-proton scattering structure functions: NNPDF3.1luxQED. The uncertainties on the resulting photon PDF are at the level of a few percent, with photons carrying up to 0.5% of the proton's momentum. We study the phenomenological implications of NNPDF3.1luxQED at the LHC for Drell-Yan, vector boson pair, top quark pair, and Higgs plus vector boson production. We find that photon-initiated contributions can be significant for many processes, leading to corrections of up to 20%. Our results represent a state-of-the-art determination of the partonic structure of the proton including its photon component.

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Drell-Yan scattering Electroweak corrections Higgs boson Large Hadron Collider (LHC) Lepton-proton scattering Partons Quantum chromodynamics (QCD)

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