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Can New Physics hide inside the proton?

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arxiv 1905.05215 v1 pith:LUGGBYZH submitted 2019-05-13 hep-ph hep-ex

Can New Physics hide inside the proton?

classification hep-ph hep-ex
keywords pdfseffectsfittedprotonsmeftstructureaboveaffect
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Modern global analyses of the structure of the proton include collider measurements which probe energies well above the electroweak scale. While these provide powerful constraints on the parton distribution functions (PDFs), they are also sensitive to beyond the Standard Model (BSM) dynamics if these affect the fitted distributions. Here we present a first simultaneous determination of the PDFs and BSM effects from deep-inelastic structure function data by means of the NNPDF framework. We consider representative four-fermion operators from the SM Effective Field Theory (SMEFT), quantify to which extent their effects modify the fitted PDFs, and assess how the resulting bounds on the SMEFT degrees of freedom are modified. Our results demonstrate how BSM effects that might otherwise be reabsorbed into the PDFs can be systematically disentangled.

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Cited by 4 Pith papers

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    hep-ph 2026-01 unverdicted novelty 4.0

    Higher-order QCD predictions for pp to tW enable three-parameter SMEFT fits that constrain effective new-physics scales to 0.5–2 TeV using LHC Run II and III data.