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

Author(s)
Cowan, Ray Franklin; Spitznagel, M.; Sciolla, Gabriella; Fisher, Peter H.; Koeneke, Karsten; Taylor, Frank E.; Dujmic, Denis; Yamamoto, R. K.; Zhao, M.; ... Show more Show less
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Abstract
We measure branching fractions and integrated rate asymmetries for the rare decays B→K(*)l+l-, where l+l- is either e+e- or μ+μ-, using a sample of 384×10(6) BB̅ 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/ψ resonance, we find evidence for unexpectedly large isospin asymmetries in both B→Kl+l- and B→K*l+l- which differ, respectively, by 3.2σ and 2.7σ, including systematic uncertainties, from the standard model expectations.
Date issued
2009-03
URI
http://hdl.handle.net/1721.1/51756
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Aubert, B. et al. “Direct CP, Lepton Flavor, and Isospin Asymmetries in the Decays B-->K(*)l+l-.” Physical Review Letters 102.9 (2009): 091803. © 2009 The American Physical Society.
Version: Final published version
ISSN
0031-9007

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