A framework for simultaneous fit of QCD and BSM parameters with xFitter

Jun Gao; Katerina Lipka; Oleksandr Zenaiev; Simone Amoroso; Xiaomin Shen

A framework for simultaneous fit of QCD and BSM parameters with xFitter

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arxiv 2407.16061 v2 pith:LS6Q4GLA submitted 2024-07-22 hep-ph

A framework for simultaneous fit of QCD and BSM parameters with xFitter

XiaoMin Shen , Simone Amoroso , Jun Gao , Katerina Lipka , Oleksandr Zenaiev This is my paper

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keywords parameterssimultaneoussmeftpdfsxfitterdeterminationextensionframework

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An extension of the xFitter open-source program for QCD analyses is presented, allowing for a polynomial parameterization of the dependence of physical observables on theoretical parameters. This extension enables simultaneous determination of parton distribution functions (PDFs) and new physics parameters within the framework of the Standard Model Effective Field Theory (SMEFT). The functionalities of the code are illustrated in a sensitivity study, where a simultaneous determination of the PDFs, top quark mass and the couplings of selected dimension-6 SMEFT operators is addressed using projections for measurements of top quark-antiquark pair production at the High-Luminosity LHC. The importance of considering all the correlations of the parton distributions, top quark mass and the EFT parameters in a simultaneous QCD+SMEFT analysis is demonstrated. This work serves as a new platform for simultaneous extraction of the PDFs and the SM/SMEFT parameters based on xFitter.

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Simultaneous extraction of top quark mass, strong coupling, effective mixing angle, and proton PDFs using inclusive DIS and proton-proton collision data
hep-ph 2026-07 conditional novelty 6.0

A single xFitter global fit extracts PDFs, alpha_s(mZ), top pole mass, and sin^2 theta_eff simultaneously at NNLO, with NLO NRQCD threshold corrections, yielding m_t=172.59 GeV, alpha_s=0.1179, sin^2 theta_eff=0.23142.