Study of charmless hadronic B decays into the final states Kπ, ππ, and KK, with the first observation of B → π⁺ π^- and B→ K⁰π⁰

1999/08/08 by CLEO Collaboration
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #hep-ex

paper · pdf · doi:10.48550/arxiv.hep-ex/9908039

Leppho99 conference submission. All results are preliminary

arxiv created 1999/08/08 · arxiv updated 2012/08/27

Abstract

We have studied charmless hadronic decays of B mesons into two-body final states with kaons and pions. We present preliminary results based on 9.66 million BB pairs collected with the CLEO detector. We have made the first observation of the decay B → π⁺π^-, with the branching fraction of Br(B → π⁺ π^-) = (4.7^+1.8_-1.5 ± 0.6) × 10^-6. We have also observed for the first time the decay B → K⁰π⁰ with the branching fraction of Br(B → K⁰ π⁰) = (14.8^+5.9+2.4_-5.1-3.3) × 10^-6, thus completing the set of four Kπ branching fraction measurements. We present improved measurements for the decays B→ K^±π^∓, B^±→ K⁰π^±, and B^±→ K^±π⁰. We use these and other charmless hadronic B decays to make a first determination of the value of the weak phase \rm Arg(V^*_ub)=γ= 113^∘^{+25^∘}_-23^∘.

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