https://doi.org/10.1140/epjc/s10052-024-13585-w
Regular Article
A framework for simultaneous fit of QCD and BSM parameters with xFitter
1
Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607, Hamburg, Germany
2
INPAC, Shanghai Key Laboratory for Particle Physics and Cosmology, School of Physics and Astronomy, Shanghai Jiao-Tong University, 200240, Shanghai, China
3
Key Laboratory for Particle Astrophysics and Cosmology (MOE), 200240, Shanghai, China
4
Fakultät für Mathematik und Naturwissenschaften, Bergische Universität Wuppertal, Gaußstrasse 20, 42119, Wuppertal, Germany
5
Institute for Theoretical Physics, Hamburg University, Luruper Chaussee 149, 22761, Hamburg, Germany
Received:
2
August
2024
Accepted:
6
November
2024
Published online:
29
November
2024
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 SMEFT 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.
© The Author(s) 2024
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