B →πll Form Factors for New Physics Searches from Lattice QCD

Jon A. Bailey, A. Bazavov, C. Bernard, C. M. Bouchard, C. DeTar, Daping Du, A. X. El-Khadra, E. D. Freeland, E. Gámiz, Steven Gottlieb, U. M. Heller, A. S. Kronfeld, J. Laiho, L. Levkova, Yuzhi Liu, E. Lunghi, P. B. Mackenzie, Y. Meurice, E. Neil, Si Wei QiuJ. N. Simone, R. Sugar, D. Toussaint, R. S. Van De Water, Ran Zhou

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53 Scopus citations


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].

Original languageEnglish (US)
Article number152002
JournalPhysical Review Letters
Issue number15
StatePublished - Oct 7 2015

ASJC Scopus subject areas

  • General Physics and Astronomy


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