Measurements of charmless B decays at Belle

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• 作者：Marko Petrič ; for the Belle collaboration
• 关键词：Belle ; decays of bottom mesons ; charge conjugation ; parity ; time reversal ; other discrete symmetries
• 刊名：Nuclear and Particle Physics Proceedings
• 出版年：2016
• 出版时间：April-June 2016
• 年：2016
• 卷：273-275
• 期：Complete
• 页码：1349-1353
• 全文大小：352 K

文摘

These proceedings cover recent measurements of rare charmless decays $B^{+}\to {\bar{K}}^{⁎}{(892)}^0{K}^{⁎}{(892)}^{+},B^0\to {\eta }^{\prime }{K}^{⁎}{(892)}^0$ and B⁰→π⁰π⁰$B^0\to {\pi }^0{\pi }^0$ with a data sample of $772\times {10}^{6}B\bar{B}$ pairs collected at the ϒ(4S)$\mathrm{\Upsilon }(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy e⁺e⁻$e^{+}{e}^{-}$ collider. In the decay channel $B^{+}\to {\bar{K}}^{⁎}{(892)}^0{K}^{⁎}{(892)}^{+}$ an excess of 2.73σ   is observed, which corresponds to $\mathcal{B}=({0.77}_{-0.30}^{+0.35}\pm 0.12)\times {10}^{-6}$ and a longitudinal polarization f_L=1.06±0.30±0.14$f_L=1.06\pm 0.30\pm 0.14$. A signal strength of 5.0σ   is measured in the decay channel B⁰→η^′K^⁎(892)⁰$B^0\to {\eta }^{\prime }{K}^{⁎}{(892)}^0$ with the corresponding B=(2.6±0.7±0.2)×10⁻⁶$\mathcal{B}=(2.6\pm 0.7\pm 0.2)\times {10}^{-6}$ and a CP   asymmetry of A_CP=−0.22±0.29±0.07$A_{CP}=-0.22\pm 0.29\pm 0.07$. Finally we report an updated measurement of B⁰→π⁰π⁰$B^0\to {\pi }^0{\pi }^0$ decays, with a measured branching fraction of B=(0.90±0.12±0.10)×10⁻⁶$\mathcal{B}=(0.90\pm 0.12\pm 0.10)\times {10}^{-6}$.