Электронный каталог

Статья

Belov, I.
Nonfacrorizable Charming-Loop Contribution to FCNC B&sub(s)*>*gl*+l*- Decay / I.Belov, A.Berezhnoy, D.Melikhov // Physical Review D [Electronic resource]. – 2024. – Vol. 109, No. 11. – P. 114012. – URL: https://doi.org/10.1103/PhysRevD.109.114012. – Bibliogr.: 60.

We present the first theoretical calculation of nonfactorizable charm-quark loop contributions to the 𝐵&sub(𝑠) →𝛾⁢𝑙*+⁢𝑙&sup(−) amplitude. We calculate the relevant form factors, 𝐻&sup(NF)&sub(𝐴,𝑉)⁡(𝑘&sup(′2), 𝑘*2), and provide convenient parametrizations of our results in the form of fit functions of two variables, 𝑘&sup(′2) and 𝑘*2, applicable in the region below hadron resonances, 𝑘&sup(′2) < 𝑀*2&sub(𝐽/𝜓) and 𝑘*2 < 𝑀*2&sub(𝜙). We report that factorizable and nonfactorizable charm contributions to the 𝐵&sub(𝑠) →𝛾⁢𝑙*+⁢𝑙&sup(−) amplitude have opposite signs. To compare the charm and the top contributions, it is convenient to express nonfactorizable charming loop contribution as a nonuniversal (i.e., dependent on the reaction) 𝑞*2-dependent correction Δ&sup(NF)⁢𝐶&sub(7)⁡(𝑞*2) to the Wilson coefficient 𝐶&sub(7). For the 𝐵&sub(𝑠) →𝛾⁢𝑙*+⁢𝑙&sup(−) amplitude, the correction is found to be positive, Δ&sup(NF)⁢𝐶&sub(7)⁡(𝑞*2)/𝐶&sub(7) > 0.



ОИЯИ = ОИЯИ (JINR)2024
Спец.(статьи,препринты) = С 324.1б - Сильные взаимодействия. Электромагнитная структура частиц. Алгебра токов. Киральные теории. Теория Редже$
Бюллетени = 31/024