Refining the GENEVA method for Higgs boson production via gluon fusion

A bstract 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 sc...

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Bibliographic Details
Published inThe journal of high energy physics Vol. 2023; no. 5; pp. 128 - 39
Main Authors Alioli, Simone, Billis, Georgios, Broggio, Alessandro, Gavardi, Alessandro, Kallweit, Stefan, Lim, Matthew A., Marinelli, Giulia, Nagar, Riccardo, Napoletano, Davide
Format Journal Article
LanguageEnglish
Published Berlin/Heidelberg Springer Berlin Heidelberg 16.05.2023
Springer Nature B.V
Springer Nature
SpringerOpen
Subjects
Accuracy
Classical and Quantum Gravitation
Dependence
Elementary Particles
Gluons
Higgs bosons
Higgs Production
High energy physics
Higher-Order Perturbative Calculations
Matching
Parton Shower
Partons
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
Quantum Physics
Quarks
Regular Article - Theoretical Physics
Relativity Theory
Resummation
String Theory
Higgs Production
Parton Shower
Resummation
Higher-Order Perturbative Calculations
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Summary:A bstract 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.
Bibliography:AC02-05CH11231; 714788; 101002090
USDOE Office of Science (SC)
European Research Council (ERC)
ISSN:1029-8479
1029-8479
DOI:10.1007/JHEP05(2023)128