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

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

2001-06-14

arxiv.org/abs/hep-ex/0106060v2

Phys.Rev.Lett.87:181803,2001

Physics

High Energy Physics

High Energy Physics - Experiment

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

Scientific paper

10.1103/PhysRevLett.87.181803

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.

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