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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 Art.-Nr.: 144
Vorab online veröffentlicht am 22.10.2024
Nachgewiesen in Scopus
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