BaBar Collaboration (Including:

). (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. doi:10.1103/PhysRevLett.102.091803 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, Engineering and Medicine > Science > Physics
Journal or Publication Title:	Physical Review Letters
Publisher:	American Physical Society
ISSN:	0031-9007
Official Date:	6 March 2009
Dates:	Date Event 6 March 2009 Published
Volume:	Vol.102
Number:	No.9
Number of Pages:	7
Page Range:	article no. 091803
DOI:	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)

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