Direct CP, Lepton Flavor and Isospin Asymmetries in the Decays B->K(*)l+l-

The BaBar Collaboration, Philip Clark

Research output: Contribution to journalArticlepeer-review

Abstract

We measure rate asymmetries for the rare decays B->K(*)l+l-, where l+l- is either e+e- or mu+mu-, using a sample of 384 million BBbar events collected with the Babar detector at the PEP-II e+e- collider. We find no evidence for direct CP or lepton-flavor asymmetries. 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.
Original languageEnglish
Article number091803
Number of pages7
JournalPhysical Review Letters
Volume102
Issue number9
DOIs
Publication statusPublished - 25 Jul 2008

Keywords

  • hep-ex

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