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Nonleptonic B-meson decays to 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 QCD corrections to the partonic processes b → c¯ud and b → c¯cs, which constitute the dominant decay channels in standard model predictions for B-meson lifetimes within the heavy quark expansion. We consider the contribution from the four-quark operators O$_1$ and O$_2$ in the ∆B = 1 effective Hamiltonian. The decay rates are obtained from the imaginary parts of four-loop propagator-type diagrams. We compute the corresponding master integrals using the “expand and match” approach which provides semi-analytic results for the physical charm and bottom quark masses. We show that the dependence of the decay rate on the renormalization scale is significantly reduced after including the next-to-next-to-leading order corrections. Furthermore, we compute next-to-next-to-leading order corrections to the Cabibbo-Kobayashi-Maskawa-suppressed
decay channels b → u¯cs and b → u¯ud.


Verlagsausgabe §
DOI: 10.5445/IR/1000176068
Veröffentlicht am 08.11.2024
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Theoretische Teilchenphysik (TTP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2024
Sprache Englisch
Identifikator ISSN: 1029-8479
KITopen-ID: 1000176068
Erschienen in Journal of High Energy Physics
Verlag Scuola Internazionale Superiore di Studi Avanzati (SISSA)
Band 2024
Heft 10
Seiten 144
Vorab online veröffentlicht am 22.10.2024
Nachgewiesen in Web of Science
Dimensions
Scopus
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