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

Journal article

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 384×106 BB̄ 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. © 2009 The American Physical Society.

Authors: Aubert, B; Bona, M; Karyotakis, Y; Lees, J; Poireau, V

• Publication status: Published
• Journal: Physical Review Letters
• Volume: 102
• Issue: 9
• Publication date: 2009-03-06
• DOI: 10.1103/PhysRevLett.102.091803
• EISSN: 1079-7114
• ISSN: 0031-9007
• Language: English