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Title: Direct CP, Lepton Flavor, and Isospin Asymmetries in the Decays B→K(*)l+l−
Author: Garra Ticó, Jordi
Graugés Pous, Eugeni
BABAR Collaboration
Keywords: Física de partícules
Particle physics
Issue Date: 4-Mar-2009
Publisher: American Physical Society
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 B ¯¯¯ B events collected with the BABAR detector at the PEP-II e + e − collider. We find no evidence for direct C P or lepton-flavor asymmetries. However, for dilepton masses below the J / ψ resonance, we find evidence for unexpectedly large isospin asymmetries in both B → K l + l − and B → K ∗ l + l − which differ, respectively, by 3.2 σ and 2.7 σ , including systematic uncertainties, from the standard model expectations.
Note: Reproducció del document publicat a:
It is part of: Physical Review Letters, 2009, vol. 102, num. 9, p. 091803
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ISSN: 0031-9007
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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