Effect of Fermionic Operators on the Gauge Legacy of the LHC Run I

TL;DR

This paper reevaluates the constraints on electroweak gauge boson couplings from LHC Run I data by including additional dimension-six operators, revealing how these operators influence the bounds on certain Wilson coefficients.

Contribution

It introduces a comprehensive global fit framework that accounts for additional operators affecting gauge couplings and self-energies, updating previous bounds with electroweak precision data.

Findings

Constraints on $f_B/\Lambda^2$ and $f_W/\Lambda^2$ are altered by additional operators.

Limits on $f_{WWW}/\Lambda^2$ remain unaffected.

Inclusion of extra operators refines the understanding of gauge coupling modifications.

Abstract

We revisit the extraction of the triple electroweak gauge boson couplings from the Large Hadron Collider Run I data on the $W^+W^-$ and $W^\pm Z$ productions when the analysis also contains additional operators that modify the couplings of the gauge bosons to light quarks and the gauge boson self-energies. We work in the framework of effective Lagrangians where we consider dimension-six operators and perform a global fit to consistently take into account the bounds on these additional operators originating from the electroweak precision data. We show that the constraints on the Wilson coefficients $f_B/\Lambda^2$ and $f_W/\Lambda^2$ are modified when we include the additional operators while the limits on $f_{WWW}/\Lambda^2$ remain unchanged.