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Durham University

Department of Physics

Staff profile

Publication details for Prof Nigel Glover

Gauld, R., Ridder, A. Gehrmann-De, Glover, E.W.N., Huss, A. & Majer, I. (2019). Associated production of a Higgs boson decaying into bottom quarks and a weak vector boson decaying leptonically at NNLO in QCD. Journal of High Energy Physics 2019(10): 2.

Author(s) from Durham

Abstract

We present the calculation of next-to-next-to-leading order (NNLO) corrections in perturbative QCD for the production of a Higgs boson decaying into a pair of bottom quarks in association with a leptonically decaying weak vector boson: pp → V H+X →
`
¯` bb +¯ X. We consider the corrections to both the production and decay sub-processes,
retaining a fully differential description of the final state including off-shell propagators of
the Higgs and vector boson. The calculation is carried out using the antenna subtraction
formalism and is implemented in the NNLOjet framework. Clustering and identification
of b-jets is performed with the flavour-kt algorithm and results for fiducial cross sections
and distributions are presented for the LHC at √
s = 13 TeV. We assess the residual theory
uncertainty by varying the production and decay scales independently and provide scale
uncertainty bands in our results, yielding percent-level accurate predictions for observables
in this Higgs production mode computed at NNLO. Confronting a na¨ıve perturbative expansion of the cross section against the customary re-scaling procedure to a fixed branching
ratio reveals that starting from NNLO, the latter could be inadequate in estimating missing
higher-order effects through scale variations.