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Title:	Search for the rare decay B -> πl(+)l(-)
Authors:	Aubert, B.; Garra Tico, J.; Grauges, E.; Azzolini, Virginia; López-March, Neus ; Martínez-Vidal, Fernando ; Milanés, Diego A. ; Oyanguren, Arantza ; Babar Collaboration
Keywords:	Quark model B mesons Isotopic spin (elementary particles) Meson decay Neutral currents Semileptonic decays
Issue Date:	30-Jul-2007
Publisher:	American Physical Society
Citation:	Physical Review Letters 99(5): 051801 (2007)
Abstract:	We 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.
Description:	7 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
URI:	http://hdl.handle.net/10261/9895
DOI:	10.1103/PhysRevLett.99.051801
ISSN:	0031-9007
Appears in Collections:	(IFIC) Artículos