Combined effective field theory interpretation of measurements sensitive to quartic gauge boson couplings in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

TL;DR

This paper combines multiple measurements from the ATLAS detector at the LHC to constrain anomalous quartic gauge boson couplings using an effective field theory approach, providing comprehensive confidence intervals and theoretical bounds.

Contribution

It presents a combined EFT interpretation of various measurements sensitive to quartic gauge couplings, incorporating multiple analyses and theoretical constraints for the first time.

Findings

Constraints on Wilson coefficients at 68% and 95% CL

Confidence intervals with and without unitarity constraints

Overlay of unitarity and positivity bounds

Abstract

A combination of measurements sensitive to anomalous quartic electroweak gauge boson couplings is presented using proton-proton collision data collected by the ATLAS detector at $\sqrt{s} = 13$ TeV at the LHC. Contributing analyses include measurements of vector-boson scattering in numerous final states as well as a tri-boson measurement. The combined measurement is used to constrain anomalous electroweak boson quartic self-couplings that result from dimension-8 operators in the \'{E}boli model using an effective field theory. Results are presented as 68% and 95% confidence level intervals parameterised by one or two Wilson coefficients, both with and without unitarity constraints applied. Theoretical bounds from unitarity and positivity are overlaid where relevant. Confidence intervals obtained from simultaneous profiled fits to all Wilson coefficients are also presented.