Three-body non-leptonic heavy-to-heavy B decays at NNLO in QCD

Journal of High Energy Physics

Javier Virto¹  Tobias Huber²  K. Keri Vos³ 

[1] Departament de Física Quàntica i Astrofísica, Institut de Ciències del Cosmos, Universitat de Barcelona, Martí Franquès 1, E08028, Barcelona, Catalunya, Spain;Naturwissenschaftlich-Technische Fakultät, Universität Siegen, Walter-Flex-Straße 3, 57068, Siegen, Germany;Physics Department T31, Technische Universität München, James Franck-Straße 1, D-85748, Garching, Germany;

关键词: CP violation;    Effective Field Theories;    Heavy Quark Physics;    Perturbative QCD;   

DOI  :  10.1007/JHEP11(2020)103

来源: Springer

【 摘 要 】

Exclusive non-leptonic two-body decays of B mesons have been studied extensively in the past two decades within the framework of factorization. However, the exploration of the corresponding three-body case has only started recently, in part motivated by new data. We consider here the simplest non-leptonic three-body B decays from the point of view of factorization, namely heavy-to-heavy transitions. We provide a careful derivation of the SCET/QCDF factorized amplitudes to NNLO in αs, and discuss the numerical impact of NLO and NNLO corrections. We then study the narrow-width limit, showing that the three-body amplitude reproduces analytically the known quasi-two-body decay amplitudes, and compute finite-width corrections. Finally, we discuss certain observables that are sensitive to perturbative NLO and NNLO corrections and to higher Gegenbauer moments of the dimeson LCDAs. This is the first study of non-leptonic three-body B decays to NNLO in QCD.

【 授权许可】

CC BY