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

By Valerio Bertone, Stefano Carrazza, Nathan Hartland, Juan Rojo. SciPost Physics, 2017

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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 \simeq0.5\%≃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\%20%. Our results represent a state-of-the-art determination of the partonic structure of the proton including its photon component.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/c340e84a712ac6a6bd9a5fba911bd335efb8e463

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In Astronomy and Astrophysics

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In Nuclear and High Energy Physics

  1. Yi-Fu Cai
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  4. Tong Li
  5. Robert Brandenberger
  6. Emmanuel N. Saridakis

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