KIT | KIT-Bibliothek | Impressum | Datenschutz

Generic calculation of two-body partial decay widths at the full one-loop level

Goodsell, Mark D.; Liebler, Stefan; Staub, Florian 1,2
1 Institut für Theoretische Physik (ITP), Karlsruher Institut für Technologie (KIT)
2 Institut für Kernphysik (IKP), Karlsruher Institut für Technologie (KIT)


We describe a fully generic implementation of two-body partial decay widths at the full one-loop level in the SARAH and SPheno framework compatible with most supported models. It incorporates fermionic decays to a fermion and a scalar or a gauge boson as well as scalar decays into two fermions, two gauge bosons, two scalars or a scalar and a gauge boson. We present the relevant generic expressions for virtual and real corrections. Whereas wave-function corrections are determined from on-shell conditions, the parameters of the underlying model are by default renormalised in a DR ¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯
(or MS ¯ ¯ ¯ ¯ ¯ ¯ ¯
) scheme. However, the user can also define model-specific counter-terms. As an example we discuss the renormalisation of the electric charge in the Thomson limit for top-quark decays in the standard model. One-loop-induced decays are also supported. The framework additionally allows the addition of mass and mixing corrections induced at higher orders for the involved external states. We explain our procedure to cancel infrared divergences for such cases, which is achieved through an infrared counter-term taking into account corrected Goldstone boson vertices. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000076839
Veröffentlicht am 23.11.2017
DOI: 10.1140/epjc/s10052-017-5259-x
Zitationen: 38
Web of Science
Zitationen: 35
Zitationen: 37
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Kernphysik (IKP)
Institut für Theoretische Physik (ITP)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 11.2017
Sprache Englisch
Identifikator ISSN: 1434-6044, 1434-6052
KITopen-ID: 1000076839
HGF-Programm 51.01.01 (POF III, LK 01) Teilchenphysik
Erschienen in The European physical journal / C
Verlag Springer Verlag
Band 77
Heft 11
Seiten Art. Nr.: 758
Bemerkung zur Veröffentlichung Gefördert durch SCOAP3
Nachgewiesen in Scopus
Web of Science
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
KITopen Landing Page