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arxiv 2401.08749 v2 pith:X57GX3RM submitted 2024-01-16 hep-ph

Photons in the proton: implications for the LHC

The NNPDF Collaboration: Richard D. Ball , Andrea Barontini , Alessandro Candido , Stefano Carrazza , Juan Cruz-Martinez , Luigi Del Debbio , Stefano Forte , Tommaso Giani
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Felix Hekhorn Zahari Kassabov Niccol\`o Laurenti Giacomo Magni Emanuele R. Nocera Tanjona R. Rabemananjara Juan Rojo Christopher Schwan Roy Stegeman Maria Ubiali
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keywords alphaphotoncorrectionsimpactincludennpdf4processesrecent
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We construct a set of parton distribution functions (PDFs), based on the recent NNPDF4.0 PDF set, that also include a photon PDF. The photon PDF is constructed using the LuxQED formalism, while QED evolution accounting for O(alpha), O(alpha alphas) and O(alpha^2) corrections is implemented and benchmarked by means of the EKO code. We investigate the impact of QED effects on NNPDF4.0, and compare our results both to our previous NNPDF3.1QED PDF set and to other recent PDF sets that include the photon. We assess the impact of photon-initiated processes and electroweak corrections on a variety of representative LHC processes, and find that they can reach the 5% level in vector boson pair production at large invariant mass.

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Cited by 2 Pith papers

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    hep-ph 2026-07 conditional novelty 7.0

    Single inclusive high-PT hadron and jet production in lepton-hadron scattering is factorized using a joint QCD+QED approach with universal lepton distribution functions, and predictions are given for JLab and EIC energies.

  2. Les Houches 2023 -- Physics at TeV Colliders: Report on the Standard Model Precision Wishlist

    hep-ph 2025-04 unverdicted novelty 2.0

    The report reviews progress since 2021 in fixed-order computations for LHC applications and identifies processes requiring missing higher-order corrections to match anticipated experimental precision.