A tale of Z+jet: SMEFT effects and the Lam-Tung relation
Abstract
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 A0 and A2, which enter the Lam-Tung relation.
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