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Rare FCNC radiative leptonic Bs,d→γℓ+ℓ− decays in the SMстатья
Дата последнего поиска статьи во внешних источниках: 4 августа 2021 г.
- Авторы: Melikhov D., Kozachuk A., Nikitin N.
- Журнал: Proceedings of Science
- Том: 336
- Год издания: 2019
- Издательство: Sissa Medialab
- Местоположение издательства: Italy
- Первая страница: 1
- Последняя страница: 8
- Номер статьи: 274
- DOI: 10.22323/1.336.0274
- Аннотация: We report our recent results for long-distance QCD effects in the flavour-changing neutral current radiative leptonic decays B→γℓ+ℓ−, ℓ={e,μ}. One encounters here two distinct types of long-distance еffects: those encoded in the B→γ transition form factors induced by the b→q quark currents, and those related to the charm-loop effects. We calculate the B→γ form factors in a broad range of the momentum transfers making use of the relativisitc dispersion approach based on the constituent quark picture which has proven to provide reliable predictions for many weak-transition form factors. Concerning the description of the charm-loop contributions, we point out two оbservations: First, the precise description of the charmonium resonances, in particular, the relative phases between ψ and ψ′, has impact on the differential distributions and on the forward-backward asymmetry, AFB, in a broad range of q2≥5 GeV2. Second, the shape of AFB in B→γℓ+ℓ− and in B→Vℓ+ℓ− (V the vector meson) in the q2-region between ψ and ψ′ provides an unambiguous probe of the relative phases between ψ and ψ′. Fixing the latter will lead to a strong reduction of the theoretical uncertainties in AFB at q2=5−9 GeV2 where it has the sensitivity to physics beyond the SM.
- Добавил в систему: Мелихов Дмитрий Игоревич