Improved Upper Limits on the FCNC Decays $B\to K{\ell }^{+}{\ell }^{-}$ and $B\to K^{\ast }(892){\ell }^{+}{\ell }^{-}$

Abstract

We have searched a sample of 9.6 million BBbar events for the flavor-changing neutral current decays B -> K l^+ l^- and B -> K^*(892) l^+ l^-. We subject the latter decay to the requirement that the dilepton mass exceed 0.5 GeV. There is no indication of a signal. We obtain the 90% confidence level upper limits on the branching fractions Br(B -> K l^+ l^-) < 1.7 \times 10^{-6} and Br(B -> K^*(892) l^+ l^-) < 3.3 \times 10^{-6}. We also obtain an upper limit on the weighted average 0.65 Br(B -> K l^+ l^-) + 0.35 Br(B -> K^*(892) l^+ l^-) < 1.5 \times 10^{-6}. The weighted-average limit is only 50% above the Standard Model prediction.

11 pages postscript, also available through http://w4.lns.cornell.edu/public/CLNS, Submitted to PRL

References in corpus (2)

• A Comparative Study of the Decays $B\to (K,K^{\ast }){\ell }^{+}{\ell }^{-}$ in Standard Model and Supersymmetric Theories
• Search for the Flavor-Changing Neutral Current Decays B^+ -> mu^+ mu^- K^+ and B^0 -> mu^+ mu^-K^{*0}

Cited by in corpus (14)

• Improved Model-Independent Analysis of Semileptonic and Radiative Rare B Decays
• Observation of $B\to K^{\ast }{\ell }^{+}{\ell }^{-}$
• Evidence for the Rare Decay B -> K*ll and Measurement of the B -> Kll Branching Fraction
• Constraints on R-parity violating supersymmetry from leptonic and semileptonic tau, B_d and B_s decays
• The Forward-Backward Asymmetry of B to (pi,K) l^+ l^-: Supersymmetry at Work
• Light-front quark model analysis of rare $B\to K{\ell }^{+}{\ell }^{-}$ decays
• Radiative and Semileptonic B Decays Involving the Tensor Meson K_2^*(1430) in the Standard Model and Beyond
• Search for Lepton-Flavor-Violating Decays of B Mesons
• Search for the Rare Decays B --> Kl^+l^- and B --> K^*l^+l^-
• Implementing Asymmetric Dark Matter and Dark Electroweak Baryogenesis in a Mirror Two-Higgs-Doublet Model
• The sensitivity of the zero position of the forward--backward asymmetry to new physics effects in the B -> K^\ast μ^+ μ^- decay
• Ward Identities, B-> ρForm Factors and |V_ub|
• Bottomed baryon decays with invisible Majorana fermions
• CLEO Results: B Decays