Nonfactorizable charming loops in FCNC B decays versus B-decay semileptonic form factors

Автор: Melikhov Dmitri
Журнал: Physical Review D
Том: 106
Номер: 5
Год издания: 2022
Издательство: American Physical Society
Местоположение издательства: United States
Номер статьи: 054022
DOI: 10.1103/physrevd.106.054022
Аннотация: We compare a nonfactorizable charming-loop correction to an exclusive FCNC B decay given in termsof the three-particle Bethe-Salpeter amplitude (3BS) of the B meson, with the corresponding correction to the B-meson semileptonic form factor. In spite of certain similarities, these twocorrections are shown to have substantial differences: the form-factor correction is dominated by the collinear light-cone configuration of 3BS (zμ = u xμ, 0 < u < 1, x²=0); in contrast, the FCNC amplitude is dominated by a different configuration with noncollinear arguments [x²=0, z²=0, but (x − z)² ≠ 0 (i.e., zμ ≠ u xμ)].
Добавил в систему: Мелихов Дмитрий Игоревич

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