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Title

Direct CP, Lepton Flavor, and Isospin Asymmetries in the Decays B -> K((*))l(+)l(-)

AuthorsBabar Collaboration; Azzolini, Virginia; López-March, Neus ; Martínez-Vidal, Fernando ; Milanés, Diego A. ; Oyanguren, Arantza ; Aubert, B.
Issue Date6-Mar-2009
PublisherAmerican Physical Society
CitationPhysical Review Letters 102 (9): 091803 (2009)
AbstractWe measure branching fractions and integrated rate asymmetries for the rare decays B -> K((*))l(+)l(-), where l(+)l(-) is either e(+)e(-) or mu(+)mu(-), using a sample of 384x10(6) BB events collected with the BABAR detector at the PEP-II e(+)e(-) collider. We find no evidence for direct CP or lepton-flavor asymmetries. However, for dilepton masses below the J/psi resonance, we find evidence for unexpectedly large isospin asymmetries in both B -> Kl(+)l(-) and B -> K(*)l(+)l(-) which differ, respectively, by 3.2 sigma and 2.7 sigma, including systematic uncertainties, from the standard model expectations.
Publisher version (URL)http://dx.doi.org/ 10.1103/PhysRevLett.102.091803
URIhttp://hdl.handle.net/10261/22026
DOI10.1103/PhysRevLett.102.091803
ISSN0031-9007
Appears in Collections:(IFIC) Artículos
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