# Light-Quark Dipole Operators at LHC

## TL;DR

This paper investigates how light-quark dipole operators affect LHC observables, showing that diboson production data can robustly constrain these operators and improve upon previous electroweak precision limits.

## Contribution

It demonstrates the robustness of gauge boson self-coupling measurements against light-quark dipole operators and derives new, stronger bounds from LHC diboson and Drell-Yan data.

## Key findings

- Diboson data constrains light-quark dipole couplings more effectively than previous electroweak measurements.
- Electroweak diboson production remains a robust probe even when including unconstrained quark dipole operators.
- Drell-Yan and high-mass lepton pair searches further tighten bounds on these operators.

## Abstract

We study the effect of operators generating dipole couplings of the light quarks to electroweak gauge bosons on several observables at LHC. We start by demonstrating that the determination of the gauge boson self-couplings from electroweak diboson production at LHC is robust under the inclusion of those quark dipole operators even when let them totally unconstrained in the analysis. Conversely, we determine the bounds that the diboson data imposes on the light-quark dipole couplings and show that they represent a significant improvement over the limits arising from Z and W electroweak precision measurements. We also explore the sensitivity of the Drell-Yan cross section determination at LHC Run 1, and the results on resonance searches in high invariant-mass lepton pair production at Run 2 to further constrain the electroweak dipole couplings of the light quarks.