Электронный каталог

Статья

Ivanov, M.A.
Constraining *L&sub(Bs) by B&sub(s) *> *g* and B&sub(s) *> *f Form Factors / M.A.Ivanov, D.Melikhov, S.Simula // Physical Review D [Electronic resource]. – 2024. – Vol. 110, No. 9. – P. 094048. – URL: https://doi.org/10.1103/PhysRevD.110.094048. – Bibliogr.: 31.

We calculate the form factors 𝐹𝑉⁡(𝑞*2,𝑞&sup(′2)) and 𝐹𝑇⁢𝑉⁡(𝑞*2,𝑞&sup(′2)) describing the 𝐵&sub(𝑠) →𝛾* transition induced by the vector and tensor weak currents in a broad range of values of 𝑞*2 and 𝑞&sup(′2) far below the quark thresholds in both 𝑞*2 and 𝑞&sup(′2) channels. These form factors are calculated via the distribution amplitudes of the 𝐵&sub(𝑠)-meson. We then interpolate the obtained results by a formula that contains pole at 𝑞&sup(′2) =𝑀*2&sub(𝜙) and extract the residue which gives the 𝐵&sub(𝑠) →𝜙 transition form factors 𝑉⁡(𝑞*2) and 𝑇&sub(1)⁡(𝑞*2). In this way we obtain theoretical predictions for these form factors without invoking quark-hadron duality and QCD sum rules. Furthermore, we calculate the relationship between 𝑉⁡(0) and 𝑇&sub(1)⁡(0) and the parameter 𝜆&sub(𝐵𝑠)⁡(𝜇), the inverse moment of the 𝐵&sub(𝑠)-meson distribution amplitude. Using the available predictions for 𝑉⁡(0) and 𝑇&sub(1)⁡(0) coming from approaches not referring to the 𝐵&sub(𝑠)-meson distribution amplitudes, we obtain the estimate 𝜆&sub(𝐵𝑠)⁡(𝜇 ≃𝑚𝑏) =(0.62 ±0.10)  GeV.



ОИЯИ = ОИЯИ (JINR)2024
Спец.(статьи,препринты) = С 324.1д - Квантовая хромодинамика$
Бюллетени = 1/025