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 → 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.

Alioli, S., Billis, G., Broggio, A., Gavardi, A., Kallweit, S., Lim, M., et al. (2023). Refining the GENEVA method for Higgs boson production via gluon fusion. JOURNAL OF HIGH ENERGY PHYSICS, 2023(5) [10.1007/JHEP05(2023)128].

Refining the GENEVA method for Higgs boson production via gluon fusion

Alioli S.;Billis G.;Broggio A.;Gavardi A.;Kallweit S.;Lim M. A.;Marinelli Giulia.;Nagar R.
;
Napoletano D.
2023

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 → 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.
Articolo in rivista - Articolo scientifico
Higgs Production; Higher-Order Perturbative Calculations; Parton Shower; Resummation;
English
16-mag-2023
2023
2023
5
128
open
Alioli, S., Billis, G., Broggio, A., Gavardi, A., Kallweit, S., Lim, M., et al. (2023). Refining the GENEVA method for Higgs boson production via gluon fusion. JOURNAL OF HIGH ENERGY PHYSICS, 2023(5) [10.1007/JHEP05(2023)128].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/422598
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