Three-particle distribution in the B meson and charm-quark loops in FCNC B decays
- Author(s)
- Dmitri Melikhov
- Abstract
We discuss a nonfactorizable (NF) contribution of a charm loop to the FCNC B-decay amplitude given through the three-particle Bethe-Salpeter amplitude (3BS) of the B-meson. This 3BS contains one heavy-quark field and two light fields (a light quark and a gluon). Our discussion is aimed at clarifying properties of the B-meson 3BS necessary to describe properly charm-loop contributions to the amplitudes of FCNC B-decays. We demonstrate that the dominant contribution of nonfactorizable charm to FCNC B-decay amplitude is given in the heavy-quark limit by a convolution of some hard kernel and the B-meson 3BS in a "double-collinear"light cone (LC) configuration: one of the light degrees of freedom φ(x), x2=0, lies on the (+)-direction of the LC, whereas another light degree of freedom φ′(x′), x′2=0 lies along the (-)-direction. We show the emergence of new constraints on the distribution amplitudes which parametrize the 3BS in this double-collinear configuration.
- Organisation(s)
- Particle Physics
- External organisation(s)
- Anuchin Research Institute and Museum of Anthropology, Joint Institute for Nuclear Research
- Journal
- Physical Review D
- Volume
- 108
- No. of pages
- 11
- ISSN
- 2470-0010
- DOI
- https://doi.org/10.1103/PhysRevD.108.034007
- Publication date
- 08-2023
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103034 Particle physics
- ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/3b289d15-120d-4a01-b13f-48ac9cb5a7a3