B → πll form factors for new physics searches from lattice QCD

Bailey, J. A. et al. (2015) B → πll form factors for new physics searches from lattice QCD. Physical Review Letters, 115(15), 152002. (doi: 10.1103/PhysRevLett.115.152002) (PMID:26550717)

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 fT. Together with the vector and scalar form factors f+ and f0 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].

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Bouchard, Dr Chris and DeTar, Professor Carleton
• Authors: Bailey, J. A., Bazavov, A., Bernard, C., Bouchard, C.M., DeTar, C., Du, D., El-Khadra, A.X., Freeland, E.D., Gámiz, E., Gottlieb, S., Heller, U.M., Kronfeld, A.S., Laiho, J., Levkova, L., Liu, Y., Lunghi, E., Mackenzie, P.B., Meurice, Y., Neil, E., Qiu, S.-W., Simone, J. N., Sugar, R., Toussaint, D., Van de Water, R.S., and Zhou, R.
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: Physical Review Letters
• Publisher: American Physical Society
• ISSN: 0031-9007
• ISSN (Online): 1079-7114
• Copyright Holders: Copyright © 2015 American Physical Society
• First Published: First published in Physical Review Letters 115(15): 152002
• Publisher Policy: Reproduced in accordance with the publisher copyright policy

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