@article{67de2b19431f42739d8013d38ee63cc0,
title = "Charming-loop contribution to Bs →γγ decay",
abstract = "We present a detailed theoretical study of nonfactorizable contributions of the charm-quark loop to the amplitude of the Bs→γγ decay.",
author = "Ilia Belov and Alexander Berezhnoy and Dmitri Melikhov",
note = "Publisher Copyright: {\textcopyright}, 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(1+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. ",
year = "2023",
month = nov,
day = "1",
doi = "10.1103/PhysRevD.108.094022",
language = "English",
volume = "108",
journal = "Physical Review D",
issn = "2470-0010",
publisher = "AMER PHYSICAL SOC",
number = "9",
}