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

Autor: Bailey JA; Department of Physics and Astronomy, Seoul National University, Seoul 08826, South Korea., Bazavov A; Department of Physics and Astronomy, University of Iowa, Iowa City, Iowa 52242, USA., Bernard C; Department of Physics, Washington University, St. Louis, Missouri 63130, USA., Bouchard CM; Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA., DeTar C; Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah 84112, USA., Du D; Department of Physics, Syracuse University, Syracuse, New York 13244, USA., El-Khadra AX; Department of Physics, University of Illinois, Urbana, Illinois 61801, USA., Freeland ED; Liberal Arts Department, School of the Art Institute of Chicago, Chicago, Illinois 60603, USA., Gámiz E; CAFPE and Departamento de Fisica Teórica y del Cosmos, Universidad de Granada, E-18002 Granada, Spain., Gottlieb S; Department of Physics, Indiana University, Bloomington, Indiana 47405, USA., Heller UM; American Physical Society, Ridge, New York 11961, USA., Kronfeld AS; Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA.; Institute for Advanced Study, Technische Universität München, 85748 Garching, Germany., Laiho J; Department of Physics, Syracuse University, Syracuse, New York 13244, USA., Levkova L; Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah 84112, USA., Liu Y; Department of Physics, University of Colorado, Boulder, Colorado 80309, USA., Lunghi E; Department of Physics, Indiana University, Bloomington, Indiana 47405, USA., Mackenzie PB; Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA., Meurice Y; Department of Physics and Astronomy, University of Iowa, Iowa City, Iowa 52242, USA., Neil E; Department of Physics, University of Colorado, Boulder, Colorado 80309, USA.; RIKEN-BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973, USA., Qiu SW; Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah 84112, USA., Simone JN; Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA., Sugar R; Department of Physics, University of California, Santa Barbara, California 93106, USA., Toussaint D; Physics Department, University of Arizona, Tucson, Arizona 85721, USA., Van de Water RS; Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA., Zhou R; Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA.
Jazyk: angličtina
Zdroj: Physical review letters [Phys Rev Lett] 2015 Oct 09; Vol. 115 (15), pp. 152002. Date of Electronic Publication: 2015 Oct 07.
DOI: 10.1103/PhysRevLett.115.152002
Abstrakt: 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: MEDLINE