Информация о цитировании статьи получена из
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 15 февраля 2024 г.
Аннотация:We present a detailed theoretical study of nonfactorizable contributions of the charm-quark loop to the amplitude of the Bs → γγ decay. This contribution involves the B-meson three-particle Bethe-Salpeter amplitude, for which we take into account constraints from analyticity and continuity. The charming-loop contribution of interest may be described as a correction to the Wilson coefficient C7γ, C7γ → C7γ + δC7γ. We calculate an explicit dependence of δC7γ on the parameter λBs. Taking into account all theoretical uncertainties, δC7γ may be predicted with better than 10% accuracy for any given value of λBs. For our benchmark point λBs=0.45 GeV, we obtain δC7γ=0.045 +- 0.004. Presently, λBs is not known with high accuracy, but its value is expected to lie in the range 0.3 ≤ λBs[GeV] ≤ 0.6. The corresponding range of δC7γ is found to be 0.02 ≤ δC7γ ≤ 0.1. One therefore expects the correction given by charming loops at the level of at least a few percent