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Author: Yongsheng Gao, Harvard University Frank Wurthwein, California Institute of Technology (CLEO Collaboration)

Title: Charmless Hadronic B Decays at CLEO

Abstract: The CLEO collaboration has studied two-body charmless hadronic decays of B mesons into _nalstates containing two pseudo-scalar mesons, or a pseudo-scalar and a vector meson. We summarizeand discuss results presented during the winter/spring 1999 conference season, and provide a briefoutlook towards future attractions to come.In particular, CLEO presented preliminary results on the decays B_! ___ 0(Br(B_! ___0) =(1:5_0:5_0:4)_10__), B ! ____(Br(B ! ___) = (3:5+1:1____ _0:5)_10__), B ! __K?_(Br(B !__K?_) = (2:2+0:8+0:4________ ) _ 10__), and B_! K__0(Br(B_! K__0) = (1:5 _ 0:4 _ 0:3) _ 10__)at DPF99, APS99, APS99, and ICHEP98 respectively. None of these decays had been observedpreviously. The _rst two of these constitute the _rst observation of hadronic b ! u transitions. Inaddition, CLEO presented preliminary updates on a large number of previously published branchingfractions and upper limits.


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DPF99