Refining the GENEVA method for Higgs boson production via gluon fusion

Abstract

We describe a number of improvements to the GENEVA method for matching NNLO calculations to parton shower programs. In particular, we detail changes to the resummed calculation used in the matching procedure, including disentangling the cross section dependence on factorisation and beam scales, and an improved treatment of timelike logarithms. We also discuss modifications in the implementation of the splitting functions which serve to make the resummed calculation differential in the higher multiplicity phase space. These changes improve the stability of the numerical cancellation of the nonsingular term at small values of the resolution parameter. As a case study, we consider the gluon-initiated Higgs boson production process $gg\to H$. We validate the NNLO accuracy of our predictions against independent calculations, and compare our showered and hadronised results with recent data taken at the ATLAS and CMS experiments in the diphoton decay channel, finding good agreement.

39 pages, 11 figures; v2: journal version, 1 appendix and 1 figure added

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Cited by in corpus (3)

• Double Higgs production at NNLO interfaced to parton showers in GENEVA
• Logarithmically-accurate and positive-definite NLO shower matching
• Jet veto resummation for STXS $H+$1-jet bins at aNNLL${}^{\prime }$+NNLO