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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.


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
Projektinformation GRK 1694 (DFG, DFG KOORD, GRK 1694/1)
Schlagwörter Higgs gluon fusion, Mixed QCD-EW, NLO, multi-loop
Referent/Betreuer Melnikov, K.
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
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