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Photons in the proton: implications for the LHC

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

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 Niccolò Laurenti Giacomo Magni Emanuele R. Nocera Tanjona R. Rabemananjara Juan Rojo Christopher Schwan Roy Stegeman Maria Ubiali
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keywords alphaphotoncorrectionsimpactincludennpdf4processesrecent
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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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Forward citations

Cited by 5 Pith papers

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  3. A Determination of the Top Mass from a Global PDF Analysis

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  4. Parton distributions confront LHC Run II data: a quantitative appraisal

    hep-ph 2025-01 conditional novelty 6.0 of 10

    A systematic NNLO data-theory comparison shows that the main PDF sets generalise to unseen LHC and HERA data about equally well once PDF, alpha_s, and missing higher order uncertainties are included.

  5. QED-enhanced PDF implications for the Higgs sector

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    Modern LUX-based photon PDFs in CT, MSHT and NNPDF produce consistent QED corrections to Higgs production, with a residual 3-4% spread dominated by baseline QCD PDF differences.

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