Direct CP, Lepton Flavor, and Isospin Asymmetries in the Decays B{yields}K{sup (*)}l{sup +}l{sup -}

Journal Article · Fri Mar 06 04:00:00 EST 2009 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.102.091803· OSTI ID:21180253

Aubert, B; Bona, M; Karyotakis, Y; Lees, J P; Poireau, V; Prencipe, E; Prudent, X; Tisserand, V ^[1]; Garra Tico, J; Grauges, E ^[2]; Lopez, L; Palano, A; Pappagallo, M ^[3]; Eigen, G; Stugu, B; Sun, L ^[4]; Abrams, G S; Battaglia, M; Brown, D N; Cahn, R N ^[5]

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1. Laboratoire de Physique des Particules, IN2P3/CNRS et Universite de Savoie, F-74941 Annecy-Le-Vieux (France)
2. Universitat de Barcelona, Facultat de Fisica, Departament ECM, E-08028 Barcelona (Spain)
3. INFN Sezione di Bari, I-70126 Bari (Italy)
4. University of Bergen, Institute of Physics, N-5007 Bergen (Norway)
5. Lawrence Berkeley National Laboratory and University of California, Berkeley, California 94720 (United States)

We measure branching fractions and integrated rate asymmetries for the rare decays B{yields}K{sup (*)}l{sup +}l{sup -}, where l{sup +}l{sup -} is either e{sup +}e{sup -} or {mu}{sup +}{mu}{sup -}, using a sample of 384x10{sup 6} BB events collected with the BABAR detector at the PEP-II e{sup +}e{sup -} collider. We find no evidence for direct CP or lepton-flavor asymmetries. However, for dilepton masses below the J/{psi} resonance, we find evidence for unexpectedly large isospin asymmetries in both B{yields}Kl{sup +}l{sup -} and B{yields}K*l{sup +}l{sup -} which differ, respectively, by 3.2{sigma} and 2.7{sigma}, including systematic uncertainties, from the standard model expectations.

• OSTI ID: 21180253
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 9 Vol. 102; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
B MESONS
BRANCHING RATIO
ELECTRONS
FLAVOR MODEL
ISOSPIN
J PSI-3097 MESONS
MASS
MUONS MINUS
MUONS PLUS
PAIR PRODUCTION
PARTICLE DECAY
POSITRONS
STANDARD MODEL