Publication View

Direct CP, Lepton Flavor, and Isospin Asymmetries in the Decays B → K^(*)l^+l^- (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 384×10^6 B B 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.

Publication details

Download	http://authors.library.caltech.edu/16350/1/Aubert2009p993Phys_Rev_Lett.pdf http://resolver.caltech.edu/CaltechAUTHORS:20091015-114953685
Publisher	American Physical Society
Repository	Caltech Authors (United States)
Type	Article, PeerReviewed
Relation	http://resolver.caltech.edu/CaltechAUTHORS:20091015-114953685 http://authors.library.caltech.edu/16350/