Higgs Pseudo Observables and Radiative Corrections

TL;DR

This paper demonstrates how to incorporate leading radiative corrections into the pseudo observable framework for Higgs decays to four leptons, aligning it with next-to-leading-order electroweak calculations for precise predictions.

Contribution

It introduces a method to include radiative corrections in the pseudo observable description of Higgs to four lepton decays, matching NLO electroweak results within the SM and beyond.

Findings

Achieves 1% accuracy in the SM $h\to 2e2\mu$ spectrum with radiative corrections

Provides a framework for including radiative corrections in non-standard pseudo observables

Bridges pseudo observable approach with NLO electroweak calculations

Abstract

We show how leading radiative corrections can be implemented in the general description of $h\to 4\ell$ decays by means of Pseudo Observables (PO). With the inclusion of such corrections, the PO description of $h\to 4\ell$ decays can be matched to next-to-leading-order electroweak calculations both within and beyond the Standard Model (SM). In particular, we demonstrate that with the inclusion of such corrections the complete next-to-leading-order Standard Model prediction for the $h\to 2e2\mu$ dilepton mass spectrum is recovered within 1% accuracy. The impact of radiative corrections for non-standard PO is also briefly discussed.