The effect of an anomalous Higgs trilinear self-coupling on the h to gamma Z decay

Abstract

We compute the two-loop effects induced by an anomalous Higgs trilinear self-coupling in the partial decay width h to gamma Z. The computation is performed using the anomalous coupling approach working in the unitary gauge and in a theory in which the anomalous coupling is generated via the addition to the scalar potential part of the Standard Model Lagrangian of an (in)finite tower of (Phi^dagger Phi)^n terms. The former computation is automatically finite while the latter requires the renormalization of the lowest order contribution. We discuss the renormalization conditions that should be employed in order to obtain the same result in the two approaches. We find that the h to gamma Z process is one of the most sensitive mode to an anomalous trilinear Higgs self-coupling. As a by-product of this work we confirm one of two different results present in the literature concerning the contribution of an anomalous Higgs trilinear coupling in the h to gamma gamma decay.

17 pages, 5 figures

References in corpus (6)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• Probing the Higgs self coupling via single Higgs production at the LHC
• Indirect probes of the trilinear Higgs coupling: $gg\to h$ and $h\to \gamma \gamma$
• The decay $h\to Z\gamma$ in the Standard-Model Effective Field Theory
• Two-loop amplitudes for Higgs plus jet production involving a modified trilinear Higgs coupling

Cited by in corpus (7)

• Search for Higgs boson decays to a Z boson and a photon in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Charting the Higgs self-coupling boundaries
• Higgs boson self-coupling constraints from single Higgs, double Higgs and Electroweak measurements
• Off-shell Higgs production at the LHC as a probe of the trilinear Higgs coupling
• Physical Tuning and Naturalness
• Higgs probes of top quark contact interactions and their interplay with the Higgs self-coupling
• Two loops, four tops and two ${\gamma }_5$ schemes: a renormalization story