A comparative study of flavour-sensitive observables in hadronic Higgs decays

TL;DR

This paper analyzes flavoured jet observables in hadronic Higgs decays at future lepton colliders, comparing different decay modes and jet algorithms with NLO QCD corrections to understand their phenomenological implications.

Contribution

It provides the first NLO QCD calculations of flavoured jet observables in hadronic Higgs decays, contrasting decay categories and jet algorithms.

Findings

Differences in jet observables between Higgs decay modes.

Impact of jet algorithms on flavoured jet measurements.

Quantitative NLO corrections to key observables.

Abstract

Jet production from hadronic Higgs decays at future lepton colliders will have significantly different phenomenological implications than jet production via off-shell photon and $Z$-boson decays, owing to the fact that Higgs bosons decay to both pairs of quarks and gluons. We compute observables involving flavoured jets in hadronic Higgs decays to three partons at Born level including next-to-leading order corrections in QCD (i.e up to $\mathcal{O}(\alpha_\mathrm{S}^2))$. The calculation is performed in the framework of an effective theory in which the Higgs boson couples directly to gluons and massless $b$-quarks retaining a non-vanishing Yukawa coupling. For the energy of the leading and subleading flavoured jet, the angular separation and the invariant mass of the leading $b$-$\bar{b}$ pair, we contrast the results obtained in both Higgs decay categories and using either of the infrared-safe flavoured jet algorithms flavour-$k_\mathrm{T}$ and flavour-dressing.