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Revisiting semileptonic B meson decays at next-to-next-to-leading order

Egner, Manuel 1; Fael, Matteo; Schönwald, Kay; Steinhauser, Matthias 1
1 Institut für Theoretische Teilchenphysik (TTP), Karlsruher Institut für Technologie (KIT)

Abstract:

We compute next-to-next-to-leading order corrections to the semileptonic decay rate of B mesons for arbitrary values of the final-state quark mass. For the contribution with one massive quark in the final state, we extend the literature result and obtain analytic expressions in terms of iterated integrals. For the complete contribution, which also includes contributions with three massive quarks in the final state, we present a semi-analytic method, which leads to a precise approximation formula for the decay rate. Our results agree with the expansions available for b → c$\ell\overline{v}_\ell$ and b → u$\ell\overline{v}_\ell$ in the literature. The main emphasize of this paper is on the technical aspects of the calculation which are useful for a wider range of applications.


Verlagsausgabe §
DOI: 10.5445/IR/1000162656
Veröffentlicht am 29.09.2023
Originalveröffentlichung
DOI: 10.1007/JHEP09(2023)112
Scopus
Zitationen: 9
Dimensions
Zitationen: 7
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Theoretische Teilchenphysik (TTP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2023
Sprache Englisch
Identifikator ISSN: 1029-8479, 1126-6708, 1127-2236
KITopen-ID: 1000162656
Erschienen in Journal of High Energy Physics
Verlag Scuola Internazionale Superiore di Studi Avanzati (SISSA)
Band 2023
Heft 9
Seiten Art.Nr.: 112
Vorab online veröffentlicht am 18.09.2023
Schlagwörter Bottom Quarks, Semi-Leptonic Decays
Nachgewiesen in Dimensions
Scopus
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