| Literature DB >> 26550717 |
Jon A Bailey1, A Bazavov2, C Bernard3, C M Bouchard4, C DeTar5, Daping Du6, A X El-Khadra7, E D Freeland8, E Gámiz9, Steven Gottlieb10, U M Heller11, A S Kronfeld12,13, J Laiho6, L Levkova5, Yuzhi Liu14, E Lunghi10, P B Mackenzie12, Y Meurice2, E Neil14,15, Si-Wei Qiu5, J N Simone12, R Sugar16, D Toussaint17, R S Van de Water12, Ran Zhou12.
Abstract
The rare decay B→πℓ^{+}ℓ^{-} arises from b→d flavor-changing neutral currents and could be sensitive to physics beyond the standard model. Here, we present the first ab initio QCD calculation of the B→π tensor form factor f_{T}. Together with the vector and scalar form factors f_{+} and f_{0} from our companion work [J. A. Bailey et al., Phys. Rev. D 92, 014024 (2015)], these parametrize the hadronic contribution to B→π semileptonic decays in any extension of the standard model. We obtain the total branching ratio BR(B^{+}→π^{+}μ^{+}μ^{-})=20.4(2.1)×10^{-9} in the standard model, which is the most precise theoretical determination to date, and agrees with the recent measurement from the LHCb experiment [R. Aaij et al., J. High Energy Phys. 12 (2012) 125].Mesh：
Substances：
Year: 2015 PMID： 26550717 DOI： 10.1103/PhysRevLett.115.152002
Source DB: PubMed Journal: Phys Rev Lett ISSN： 0031-9007 Impact factor: 9.161