Three-particle distribution in B meson and charm-quark loops in FCNC B decaysстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 20 февраля 2024 г.
Аннотация: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 heavyquark 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.