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.

Aubert, B., Bona, M., Karyotakis, Y., Lees, J., Poireau, V., Prencipe, E., et al. (2009). Direct CP, Lepton Flavor, and isospin asymmetries in the decays B→K(*)l+l-. PHYSICAL REVIEW LETTERS, 102(9) [10.1103/PhysRevLett.102.091803].

Direct CP, Lepton Flavor, and isospin asymmetries in the decays B→K(*)l+l-

CARPINELLI, Massimo;
2009

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 384×106 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.
Articolo in rivista - Articolo scientifico
BABAR detector
English
2009
102
9
091803
none
Aubert, B., Bona, M., Karyotakis, Y., Lees, J., Poireau, V., Prencipe, E., et al. (2009). Direct CP, Lepton Flavor, and isospin asymmetries in the decays B→K(*)l+l-. PHYSICAL REVIEW LETTERS, 102(9) [10.1103/PhysRevLett.102.091803].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/389366
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