Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
1999-04-07
Physics
High Energy Physics
High Energy Physics - Experiment
DPF99 Proceedings. Includes all new results from CLEO for ICHEP98, DPF99, and APS99 Final version. Fixed typos, expanded secti
Scientific paper
The CLEO collaboration has studied two-body charmless hadronic decays of $B$ mesons into final states containing two pseudo-scalar mesons, or a pseudo-scalar and a vector meson. We summarize and discuss results presented during the winter/spring 1999 conference season, and provide a brief outlook towards future attractions to come. In particular, CLEO presented preliminary results on the decays $B^\pm \to \pi^\pm\rho^0$ ($Br(B^\pm \to \pi^\pm\rho^0) = (1.5 \pm 0.5 \pm 0.4)\times 10^{-5}$), $B\to \pi^\pm\rho^\mp$ ($Br(B\to \pi^\pm\rho^\mp)=(3.5^{+1.1}_{-1.0}\pm 0.5)\times 10^{-5}$), $B\to \pi^\pm K^{\star\mp}$ ($Br(B\to \pi^\pm K^{\star\mp}) = (2.2^{+0.8+0.4}_{-0.6-0.5})\times 10^{-5}$), and $B^\pm \to K^\pm \pi^0$ ($Br(B^\pm \to K^\pm \pi^0) = (1.5 \pm 0.4 \pm 0.3) \times 10^{-5}$) at DPF99, APS99, APS99, and ICHEP98 respectively. None of these decays had been observed previously. The first two of these constitute the first observation of hadronic $b\to u$ transitions. In addition, CLEO presented preliminary updates on a large number of previously published branching fractions and upper limits.
Gao Yongsheng
Würthwein Frank
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