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Search for the rare decay B -> πl(+)l(-)

AuthorsAubert, B.; Garra Tico, J.; Grauges, E.; Azzolini, Virginia; López-March, Neus ; Martínez-Vidal, Fernando ; Milanés, Diego A. ; Oyanguren, Arantza ; Babar Collaboration
KeywordsQuark model
B mesons
Isotopic spin (elementary particles)
Meson decay
Neutral currents
Semileptonic decays
Issue Date30-Jul-2007
PublisherAmerican Physical Society
CitationPhysical Review Letters 99(5): 051801 (2007)
AbstractWe have performed a search for the flavor-changing neutral-current decays B -> πl(+)l(-), where l(+)l(-) is either e(+)e(-) or μ(+)μ(-), using a sample of 230x10(6) Υ(4S)-->B[overline B] decays collected with the BABAR detector. We observe no evidence of a signal and measure the upper limit on the isospin-averaged branching fraction to be B(B -> πl(+)l(-)) < 9.1 x 10(-8) at 90% confidence level. We also search for the lepton-flavor-violating decays B-->πe(±)mu(±) and measure an upper limit on the isospin-averaged branching fraction of B(B-->πe(±)mu(±)) < 9.2 x 10(-8) at 90% confidence level.
Description7 pages, 1 figure, 2 tables.-- PACS nrs.: 13.20.He.-- ISI Article Identifier: 000248597500008.-- et al.(BABAR Collaboration).-- ArXiv pre-print available at: http://arxiv.org/abs/hep-ex/0703018
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevLett.99.051801
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