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- W2557673025 abstract "We present evidence for the flavor-changing neutral current decay B → K ∗ � + � − and a mea- surement of the B → K� + � − branching fraction, where � + � − is either an e + e − or µ + µ − pair. The data sample analyzed comprises 88.5 × 10 6 Y (4S) → B ¯ B decays collected with the BABAR detector at the PEP-II e + e − storage ring. Averaging over K (∗) isospin and lepton flavor, we obtain B(B → K ∗ � + � − )= (1.40 +0.57 −0.49 ± 0.21) × 10 −6 and B(B → K� + � − )=( 0.68 +0.17 −0.15 ± 0.04) × 10 −6 , where the uncertainties are statistical and systematic. The significance for the B → K ∗ � + � − signal is 3.0σ and for B → K� + � − the signal significance is over 7σ. PACS. 13.25.Hw - 13.20.He" @default.
- W2557673025 created "2016-12-08" @default.
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- W2557673025 date "2004-01-01" @default.
- W2557673025 modified "2023-09-27" @default.
- W2557673025 title "Evidence for K → K ∗ + − and measurement of B → K + −" @default.
- W2557673025 hasPublicationYear "2004" @default.
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