B→πllForm Factors for New Physics Searches from Lattice QCD
| Autor: | E. D. Freeland, R. S. Van de Water, Andreas S. Kronfeld, Jon A. Bailey, Steven Gottlieb, Paul B. Mackenzie, D. Du, J. N. Simone, Jack Laiho, Aida X. El-Khadra, Yannick Meurice, Enrico Lunghi, Claude Bernard, Urs M. Heller, Carleton DeTar, Robert L. Sugar, D. Toussaint, Elvira Gamiz, Si Wei Qiu, Ethan T. Neil, Chris Bouchard, Ludmila Levkova, Yuzhi Liu, Alexei Bazavov, Ran Zhou |
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| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | Physical Review Letters. 115 |
| ISSN: | 1079-7114 0031-9007 |
| DOI: | 10.1103/physrevlett.115.152002 |
| Popis: | 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]. |
| Databáze: | OpenAIRE |
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