Exploring SMEFT couplings using the forward–backward asymmetry in neutral current Drell–Yan production at the LHC

doi:10.1140/epjc/s10052-024-13480-4

2023 Impact factor 4.2

Particles and Fields

Open Access

Eur. Phys. J. C (2024) 84: 1277
https://doi.org/10.1140/epjc/s10052-024-13480-4

Regular Article

Exploring SMEFT couplings using the forward–backward asymmetry in neutral current Drell–Yan production at the LHC

the xFitter Developers’ team³^a

¹ V. N. Karazin Kharkiv National University, Kharkiv, Ukraine
² Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
³ Hamburg University, Hamburg, Germany
⁴ School of Physics, Institute for Research in Fundamental Sciences (IPM), Tehran, Iran
⁵ Department of Physics, Faculty of Science, Malayer University, Malayer, Iran
⁶ Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
⁷ Max Planck Institute, Munich, Germany
⁸ Università degli Studi di Milano-Bicocca and INFN, Milan, Italy
⁹ CERN, Geneva, Switzerland
¹⁰ University of Antwerp, Antwerpen, Belgium
¹¹ University of Oxford, Oxford, UK
¹² Cracow University of Technology, Cracow, Poland
¹³ SMU Physics, Dallas, USA

^a oleksandr.zenaiev@desy.de
^b oleksandr.zenaiev@desy.de

Received: 16 August 2024
Accepted: 9 October 2024
Published online: 9 December 2024

Abstract

Neutral current Drell–Yan (DY) lepton-pair production is considered to study Z-boson quark couplings. Using the open-source fit platform xFitter, we investigate the impact of high-statistics measurements of the neutral current DY (NCDY) forward–backward asymmetry $A_{FB}$ $A_{\textrm{FB}}$ near the weak boson mass scale in the present and forthcoming stages of the Large Hadron Collider (LHC). Besides recovering earlier results on the $A_{FB}$ $A_{\textrm{FB}}$ sensitivity to parton distribution functions, we analyze the precision determination of Z-boson couplings to left-handed and right-handed u-quarks and d-quarks, and explore Beyond-Standard-Model contributions using the Standard Model Effective Field Theory (SMEFT) framework. We perform a sensitivity study and comment on the role of the $A_{FB}$ $A_{\textrm{FB}}$ asymmetry for the electroweak SMEFT fit and precision Z-boson physics at the LHC and high-luminosity HL-LHC.

A. Anataichuk: on leave.

© The Author(s) 2024

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