TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhys.18.5.148
TI  - A tale of $Z$+jet: SMEFT effects and the Lam-Tung relation
PY  - 2025/05/06
UR  - https://scipost.org/SciPostPhys.18.5.148
JF  - SciPost Physics
JA  - SciPost Phys.
VL  - 18
IS  - 5
SP  - 148
A1  - Gauld, Rhorry
AU  - Haisch, Ulrich
AU  - Weiss, Joachim
AB  - We derive constraints on dimension-six light-quark dipole operators within the Standard Model (SM) effective field theory, based on measurements of $Z$ production at SLC and LEP, as well as $Z$+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 $A_0$ and $A_2$, which enter the Lam-Tung relation.
ER  -

@Article{10.21468/SciPostPhys.18.5.148,
	title={{A tale of $Z$+jet: SMEFT effects and the Lam-Tung relation}},
	author={Rhorry Gauld and Ulrich Haisch and Joachim Weiss},
	journal={SciPost Phys.},
	volume={18},
	pages={148},
	year={2025},
	publisher={SciPost},
	doi={10.21468/SciPostPhys.18.5.148},
	url={https://scipost.org/10.21468/SciPostPhys.18.5.148},
}