Title

Improved upper limits on the flavor-changing neutral current decays B→Kℓ+ℓ- and B→K*(892)ℓ+ℓ-

Document Type

Article

Publication Date

1-1-2001

Abstract

We have searched a sample of 9.6×106 B¯B events for the flavor-changing neutral current decays B→Kℓ ℓ- and B→K*(892)ℓ ℓ-. We subject the latter decay to the requirement that the dilepton mass m exceed 0.5 GeV. There is no indication of a signal. We obtain the 90% confidence level upper limits B(B→Kℓ ℓ-) < 1.7×10 and B(B→K*(892)ℓ ℓ-) < 3.3×10 . We also obtain an upper limit on the weighted average 0.65B B(B→Kℓ ℓ-)+0.35B(B→K*(892)ℓ ℓ-) < 1.5×10 . The weighted-average limit is only 50% above the standard model prediction. © 2001 The American Physical Society. + + + -6 + -6 + + -6 ℓℓ m ℓℓ >0.5Gev m ℓℓ >0.5Gev

Publication Name

Physical Review Letters

Volume Number

87

First Page

181803

Issue Number

18

DOI

10.1103/PhysRevLett.87.181803

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