Revisiting nonfactorizable charm-loop effects in exclusive FCNC Β-decays

Author(s)
Anastasiia Kozachuk, Dmitri Melikhov
Abstract

We revisit the calculation of nonfactorizable corrections induced by charm-quark loops in exclusive FCNC B-decays. For the sake of clarity, we make use of a field theory with scalar particles: this allows us to focus on the conceptual issues and to avoid technical complications related to particle spins in QCD. We perform a straightforward calculation of the appropriate correlation function and show that it requires the knowledge of the full generic three-particle distribution amplitude with non-aligned arguments, 〈0|s¯(y)Gμν(x)b(0)|B(p)〉. Moreover, the dependence of this quantity on the variable (x−y)2 is essential for a proper account of the (ΛQCDmb/m2/c)n terms in the amplitudes of FCNC B-decays.

Organisation(s)
Particle Physics
External organisation(s)
Lomonosov Moscow State University (MSU), Österreichische Akademie der Wissenschaften (ÖAW), Universität Wien
Journal
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume
786
Pages
378-381
No. of pages
4
ISSN
0370-2693
DOI
https://doi.org/10.1016/j.physletb.2018.10.026
Publication date
11-2018
Peer reviewed
Yes
Austrian Fields of Science 2012
103034 Particle physics
ASJC Scopus subject areas
Nuclear and High Energy Physics
Portal url
https://ucris.univie.ac.at/portal/en/publications/revisiting-nonfactorizable-charmloop-effects-in-exclusive-fcnc-decays(fa3cf167-8573-449c-9692-dc47497b4686).html