Higgs Boson Production and Decay: Dalitz Sector

TL;DR

This paper investigates rare Higgs boson processes involving photons and fermion pairs at the LHC, emphasizing the importance of electroweak NLO corrections for accurate coupling measurements.

Contribution

It provides a detailed analysis of Higgs decay and production mechanisms involving a photon or gluon and fermion pairs, highlighting the significance of electroweak NLO corrections.

Findings

Electroweak NLO corrections significantly affect Higgs process calculations.

Comparison shows differences between full cross-sections and zero-width approximation.

Defines pseudo-observables with universal meaning for Higgs couplings.

Abstract

The processes involving a Higgs boson, a photon(gluon) and a fermion pair pose severe challenges to the experimental analysis. They represent rare decays and production mechanisms of the Higgs boson at LHC. However, they are not Yukawa suppressed at next-to-leading order opening a window for the correct definition of pseudo-observables, e.g. a definition of the Higgs decay width into Z + photon with universal inherent meaning, that are currently used in extracting information for the couplings of the newly discovered resonance at LHC. The impact of genuinely electroweak NLO corrections is discussed, as well as the comparison of the full-fledged cross-sections to their zero-width approximation.