A tale of $Z$+jet: SMEFT effects and the Lam-Tung relation
High Energy Physics - Phenomenology
2025-05-07 v2 High Energy Physics - Experiment
Abstract
We derive constraints on dimension-six light-quark dipole operators within the Standard Model (SM) effective field theory, based on measurements of production at SLC and LEP, as well as +jet production at the LHC. Our new constraints exclude the parameter space that could potentially explain the observed discrepancy between theoretical predictions and experimental data for the Lam-Tung relation. With these updated limits, we model-independently determine the maximum possible influence that beyond-SM contributions could have on the angular coefficients and , which enter the Lam-Tung relation.
Keywords
Cite
@article{arxiv.2412.13014,
title = {A tale of $Z$+jet: SMEFT effects and the Lam-Tung relation},
author = {R. Gauld and U. Haisch and J. Weiss},
journal= {arXiv preprint arXiv:2412.13014},
year = {2025}
}
Comments
25 pages, 7 figures; v2: revised and expanded version of the manuscript as accepted for publication in SciPost