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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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.
DepartmentMassachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Physical Review Letters
American Physical Society
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.
Final published version