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Direct CP, lepton flavor, and isospin asymmetries in the decays B -> K((*))l(+)l(-)

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Aubert, B., Bona, M., Karyotakis, Y., Lees, J. P., Poireau, V., Prencipe, E., Prudent, X., Tisserand, V., Tico, J. Garra, Grauges, E. et al.
(2009) Direct CP, lepton flavor, and isospin asymmetries in the decays B -> K((*))l(+)l(-). Physical Review Letters, Vol.102 (No.9). article no. 091803. ISSN 0031-9007

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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 mu(+)mu(-), using a sample of 384x10(6) BB 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/psi resonance, we find evidence for unexpectedly large isospin asymmetries in both B -> Kl(+)l(-) and B -> K(*)l(+)l(-) which differ, respectively, by 3.2 sigma and 2.7 sigma, including systematic uncertainties, from the standard model expectations.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science > Physics
Journal or Publication Title: Physical Review Letters
Publisher: American Physical Society
ISSN: 0031-9007
Official Date: 6 March 2009
Volume: Vol.102
Number: No.9
Number of Pages: 7
Page Range: article no. 091803
Identification Number: 10.1103/PhysRevLett.102.091803
Status: Peer Reviewed
Publication Status: Published
Funder: DOE and NSF (U.S.), NSERC ( Canada), CEA and CNRS-IN2P3 ( France), BMBF and DFG ( Germany), INFN ( Italy), FOM ( The Netherlands)
URI: http://wrap.warwick.ac.uk/id/eprint/28316

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