Refining the GENEVA method for Higgs boson production via gluon fusion

Autor(en)

Simone Alioli, Georgios Billis, Alessandro Broggio, Alessandro Gavardi, Stefan Kallweit, Matthew A. Lim, Giulia Marinelli, Riccardo Nagar, Davide Napoletano

Abstrakt

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.

Organisation(en)

Teilchenphysik

Externe Organisation(en)

Università degli Studi di Milano-Bicocca, Deutsches Elektronen-Synchrotron DESY, University of Sussex

Journal

Journal of High Energy Physics

Band

2023

Anzahl der Seiten

39

ISSN

1029-8479

DOI

https://doi.org/10.1007/JHEP05(2023)128

Publikationsdatum

01-2023

Peer-reviewed

Ja

ÖFOS 2012

103036 Theoretische Physik

Schlagwörter

Link zum Portal

https://ucris.univie.ac.at/portal/de/publications/refining-the-geneva-method-for-higgs-boson-production-via-gluon-fusion(effd7fe0-1578-4a07-9a96-e20b4815be2d).html