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

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

2008-07-25

arxiv.org/abs/0807.4119v2

Phys.Rev.Lett.102:091803,2009

Physics

High Energy Physics

High Energy Physics - Experiment

7 pages, 3 postscript figures, final version accpeted by PRL; includes EPAPS supplemental material giving full branching fract

Scientific paper

10.1103/PhysRevLett.102.091803

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.

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