B→πll Form Factors for New Physics Searches from Lattice QCD
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 o...
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| Veröffentlicht in: | Physical review letters 2015-10, Vol.115 (15), p.152002-152002 |
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| creator | Bailey, Jon A Bazavov, A Bernard, C Bouchard, C M DeTar, C Du, Daping El-Khadra, A X Freeland, E D Gámiz, E Gottlieb, Steven Heller, U M Kronfeld, A S Laiho, J Levkova, L Liu, Yuzhi Lunghi, E Mackenzie, P B Meurice, Y Neil, E Qiu, Si-Wei Simone, J N Sugar, R Toussaint, D Van de Water, R S Zhou, Ran |
| description | 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]. |
| doi_str_mv | 10.1103/PhysRevLett.115.152002 |
| format | Article |
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| title | B→πll Form Factors for New Physics Searches from Lattice QCD |
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