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Next-to-leading order mixed QCD-electroweak corrections to Higgs boson production in gluon fusion

Bonetti, Marco

Abstract:
In this thesis next-to-leading order mixed QCD-electroweak corrections to the Higgs boson gluon-fusion cross section are evaluated. Leading order and virtual next-to-leading order amplitudes are expressed in terms of two- and three-loop master integrals. These integrals are evaluated using differential equations augmented by the choice of a basis of uniformly transcendental functions. The integration constants are fixed in a systematic way by numerically matching the solutions to their large-mass expansion. The analytic results for the master integrals are expressed in terms of uniformly transcendental combinations of Goncharov polylogarithms. The real emission contributions are implemented using the soft-gluon approximation. The evaluation of the cross section shows that the ratio between QCD and mixed QCD-electroweak contributions to the cross section remains nearly unchanged from leading order to next-to-leading order. This result removes one of the important uncertainties if the Higgs boson gluon fusion cross section.

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Volltext §
DOI: 10.5445/IR/1000096933
Veröffentlicht am 31.07.2019
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Theoretische Teilchenphysik (TTP)
Publikationstyp Hochschulschrift
Publikationsjahr 2019
Sprache Englisch
Identifikator KITopen-ID: 1000096933
Verlag Karlsruher Institut für Technologie (KIT)
Umfang 141 S.
Art der Arbeit Dissertation
Fakultät Fakultät für Physik (PHYSIK)
Institut Institut für Theoretische Teilchenphysik (TTP)
Prüfungsdatum 28.06.2019
Referent/Betreuer Prof. K. Melnikov
Projektinformation GRK 1694 (DFG, DFG KOORD, GRK 1694/1)
Schlagwörter Higgs gluon fusion, Mixed QCD-EW, NLO, multi-loop
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
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