Measurement of Rare Kaon Decay K+ -> PI+NUNU-BAR
Abstract
A decade long search for the rare kaon decay to pi+nunu-bar has been pursued by E787. Two signal events are observed, giving a measurement of the branching ratio Br(K+ -> PI+NUNU-BAR)=1.57+1.75-0.82 x 10-10 and a constraint on the Cabibbo-Kobayashi-Maskawa (CKM) matrix element 0.007<|Vtd|<0.030 (68% C.L.).
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