Three-particle distribution in the B meson and charm-quark loops in FCNC B decays

Autor(en)

Dmitri Melikhov

Abstrakt

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(en)

Teilchenphysik

Externe Organisation(en)

Lomonosov Moscow State University (MSU), Joint Institute for Nuclear Research

Journal

Physical Review D

Band

108

Anzahl der Seiten

11

ISSN

2470-0010

DOI

https://doi.org/10.1103/PhysRevD.108.034007

Publikationsdatum

08-2023

Peer-reviewed

Ja

ÖFOS 2012

103034 Teilchenphysik

ASJC Scopus Sachgebiete

Nuclear and High Energy Physics

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/threeparticle-distribution-in-the-b-meson-and-charmquark-loops-in-fcnc-b-decays(3b289d15-120d-4a01-b13f-48ac9cb5a7a3).html