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Direct CP, lepton flavor, and isospin asymmetries in the decays B-->K(*)l+l-.
Phys Rev Lett
March 2009
Laboratoire de Physique des Particules, IN2P3/CNRS et Université de Savoie, F-74941 Annecy-Le-Vieux, France.
We measure branching fractions and integrated rate asymmetries for the rare decays B-->K(*)l+l-, where l+l- is either e+e- or micro+micro-, 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.
View Article and Find Full Text PDFEvidence for the rare decay B-->K*l+l- and measurement of the B-->Kl+l- branching fraction.
Phys Rev Lett
November 2003
Laboratoire de Physique des Particules, F-74941 Annecy-le-Vieux, France.
We present evidence for the flavor-changing neutral current decay B-->K*l+l- and a measurement of the branching fraction for the related process B-->K l+l-, where l+l- is either an epsilon+epsilon- or a mu+mu- pair. These decays are highly suppressed in the standard model, and they are sensitive to contributions from new particles in the intermediate state. The data sample comprises 123 x 10(6) Upsilon(4S)-->B(-)B decays collected with the BABAR detector at the SLAC PEP-II epsilon+epsilon- storage ring.
View Article and Find Full Text PDFSearch for the rare decays B-->Kl(+)l(-) and B-->K(*)l(+)l(-).
Phys Rev Lett
June 2002
Laboratoire de Physique des Particules, F-74941 Annecy-le-Vieux, France.
We present results from a search for the flavor-changing neutral current decays B-->Kl(+)l(-) and B-->K(*)l(+)l(-), where l(+)l(-) is either an e(+)e(-) or mu(+)mu(-) pair. The data sample comprises 22.7 x 10(6) Upsilon(4S)-->B(-)B decays collected with the BABAR detector at the PEP-II B Factory.
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