Observation of B+ → ωK+ and Search for Related B Decay Modes.

Observation of B+ → ωK+ and Search for Related B Decay Modes.

November 28, 2021 | CLEO Collaboration
The CLEO Collaboration has observed the decay $ B^{+} \rightarrow \omega K^{+} $ and searched for related B meson decays using data from the CLEO II detector. With a sample of $ 6.6 \times 10^{6} $ B mesons, they observed a signal for the $ \omega K^{+} $ final state and measured a branching fraction of $ \mathcal{B}(B^{+} \rightarrow \omega K^{+}) = (1.5_{-0.6}^{+0.7} \pm 0.2) \times 10^{-5} $. They also observed some evidence for the $ \phi K^{*} $ final state and set upper limits for 22 other decay modes. These results provide insights into theoretical models and physical parameters. The study focuses on charmless non-leptonic decays of B mesons, which are important for understanding CP violation. These decays proceed mainly through weak interactions, with the b quark transforming to a lighter quark. The decay amplitude for $ b \rightarrow u $ transitions is smaller than for $ b \rightarrow c $ transitions due to the ratio of Cabibbo-Kobayashi-Maskawa matrix elements. Transitions to s and d quarks are suppressed due to flavor-changing neutral currents. Theoretical predictions are challenging due to strong interactions, but effective Hamiltonians and factorization assumptions have led to predictions that can now be tested experimentally. The results are based on data collected at the Cornell Electron Storage Ring (CESR), with an integrated luminosity of $ 3.11 \, fb^{-1} $ for the reaction $ e^{+}e^{-} \rightarrow \Upsilon(4S) \rightarrow B\overline{B} $. The final states are reconstructed using detected photons and charged particles, with $ \omega $ and $ \phi $ mesons identified via their decay modes. The analysis uses tracking systems and calorimeters to identify particles. Signal event yields are determined using unbinned multi-variable maximum likelihood fits, with systematic and statistical errors considered. The results show a significant signal for $ B^{+} \rightarrow \omega K^{+} $ with a branching fraction of $ (1.5_{-0.6}^{+0.7} \pm 0.2) \times 10^{-5} $ and a significance of $ 3.9\sigma $. A signal is also observed for $ B^{+} \rightarrow \omega h^{+} $ with a branching fraction of $ (2.5_{-0.7}^{+0.8} \pm 0.3) \times 10^{-5} $ and a significance of $ 5.5\sigma $. Some evidence is found for the sum of $ B^{+} \The CLEO Collaboration has observed the decay $ B^{+} \rightarrow \omega K^{+} $ and searched for related B meson decays using data from the CLEO II detector. With a sample of $ 6.6 \times 10^{6} $ B mesons, they observed a signal for the $ \omega K^{+} $ final state and measured a branching fraction of $ \mathcal{B}(B^{+} \rightarrow \omega K^{+}) = (1.5_{-0.6}^{+0.7} \pm 0.2) \times 10^{-5} $. They also observed some evidence for the $ \phi K^{*} $ final state and set upper limits for 22 other decay modes. These results provide insights into theoretical models and physical parameters. The study focuses on charmless non-leptonic decays of B mesons, which are important for understanding CP violation. These decays proceed mainly through weak interactions, with the b quark transforming to a lighter quark. The decay amplitude for $ b \rightarrow u $ transitions is smaller than for $ b \rightarrow c $ transitions due to the ratio of Cabibbo-Kobayashi-Maskawa matrix elements. Transitions to s and d quarks are suppressed due to flavor-changing neutral currents. Theoretical predictions are challenging due to strong interactions, but effective Hamiltonians and factorization assumptions have led to predictions that can now be tested experimentally. The results are based on data collected at the Cornell Electron Storage Ring (CESR), with an integrated luminosity of $ 3.11 \, fb^{-1} $ for the reaction $ e^{+}e^{-} \rightarrow \Upsilon(4S) \rightarrow B\overline{B} $. The final states are reconstructed using detected photons and charged particles, with $ \omega $ and $ \phi $ mesons identified via their decay modes. The analysis uses tracking systems and calorimeters to identify particles. Signal event yields are determined using unbinned multi-variable maximum likelihood fits, with systematic and statistical errors considered. The results show a significant signal for $ B^{+} \rightarrow \omega K^{+} $ with a branching fraction of $ (1.5_{-0.6}^{+0.7} \pm 0.2) \times 10^{-5} $ and a significance of $ 3.9\sigma $. A signal is also observed for $ B^{+} \rightarrow \omega h^{+} $ with a branching fraction of $ (2.5_{-0.7}^{+0.8} \pm 0.3) \times 10^{-5} $ and a significance of $ 5.5\sigma $. Some evidence is found for the sum of $ B^{+} \
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