Электронный каталог

Статья

Belov, I.
Charming-Loop Contribution to B&sub(s)*>*g*g Decay / I.Belov, A.Berezhnoy, D.Melikhov // Physical Review D [Electronic resource]. – 2023. – Vol.108, No.9. – P.094022. – URL: https://doi.org/10.1103/PhysRevD.108.094022. – Bibliogr.:57.

We present a detailed theoretical study of nonfactorizable contributions of the charm-quark loop to the amplitude of the B&sub(s)→γγ decay. This contribution involves the B-meson three-particle Bethe-Salpeter amplitude, ⟨0|s^-(y)G&sub(μν)(x)b(0)|B^-&sub(s)(p)⟩, 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 C&sub(7γ), C&sub(7γ)→C&sub(7γ)(1+δC&sub(7γ)). We calculate an explicit dependence of δC&sub(7γ) on the parameter λ&sub(Bs). Taking into account all theoretical uncertainties, δC&sub(7γ) may be predicted with better than 10% accuracy for any given value of λ&sub(Bs). For our benchmark point λ&sub(Bs)=0.45  GeV, we obtain δC&sub(7γ)=0.045±0.004. Presently, λBs is not known with high accuracy, but its value is expected to lie in the range 0.3≤λ&sub(Bs)(GeV)≤0.6. The corresponding range of δC7γ is found to be 0.02≤δC&sub(7γ)≤0.1. One therefore expects the correction given by charming loops at the level of at least a few percent.



ОИЯИ = ОИЯИ (JINR)2023
Спец.(статьи,препринты) = С 323.5 - Теория взаимодействия частиц при высоких энергиях$
Бюллетени = 7/024