Off-shell Higgs production at the LHC as a probe of the trilinear Higgs coupling

TL;DR

This paper investigates how off-shell Higgs production at the LHC can be used to constrain the trilinear Higgs coupling within the SMEFT framework, incorporating advanced loop corrections and kinematic analysis.

Contribution

It provides a detailed calculation including two-loop and one-loop corrections and assesses the LHC's potential to constrain SMEFT Wilson coefficients through off-shell Higgs measurements.

Findings

Constraints are competitive with future inclusive Higgs measurements.

Off-shell production offers complementary sensitivity to Higgs self-coupling.

Analysis demonstrates the LHC's capability to probe SMEFT parameters effectively.

Abstract

In the context of the Standard Model effective field theory (SMEFT) we examine the constraints on the trilinear Higgs coupling that originate from off-shell Higgs production in proton-proton collisions. Our calculation of the $gg \to h^\ast \to Z Z \to 4 \ell$ process includes two-loop corrections to gluon-gluon-fusion Higgs production and one-loop corrections to the Higgs propagator and its decay. Employing a matrix-element based kinematic discriminant we determine the reach of LHC Run 3 and the high-luminosity option of the LHC in constraining the relevant SMEFT Wilson coefficients. We present constraints that are not only competitive with but also complementary to the projected indirect limits that one expects to obtain from inclusive measurements of single-Higgs production processes at future LHC runs.