We measure branching fractions ; 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- ; B→K*l+l- which differ, respectively, by 3.2σ ; 2.7σ, including systematic uncertainties, from the standard model expectations. © 2009 The American Physical Society.
Direct CP, Lepton Flavor, ; isospin asymmetries in the decays B→K(*)l+l-
PALANO, Antimo;PAPPAGALLO, MARCO IGNAZIO;
2009-01-01
Abstract
We measure branching fractions ; 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- ; B→K*l+l- which differ, respectively, by 3.2σ ; 2.7σ, including systematic uncertainties, from the standard model expectations. © 2009 The American Physical Society.File in questo prodotto:
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