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arXiv 1012.5031hep-ex
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无粲B介子衰变到K ~+、K0和π ~+的部分分支分数的测量

Measurement of partial branching fractions of inclusive charmless B meson decays to K+, K0, and pi+

The BABAR Collaboration, P. del Amo Sanchez

摘要:

我们测量了$B \rightarrow K^+ X$,$B \rightarrow K^0 X$和$B \rightarrow π^+ X$的部分分支分数,其中$X$表示B衰变到粲介子的终点以上的任何可访问的终态,特别是对于B静止框架中的K介子(π介子)的候选强子的动量大于2.34(2.36)GeV。这些测量对可能进入$b \rightarrow s(d)$环跃迁的潜在新物理粒子敏感。分析是在PEP-II $e^+e^-$非对称能量对撞机上用BaBar探测器收集的由$383 \times 10^6$ $B \bar{B}$对组成的数据样本上进行的。我们的结果与标准模型预测一致,并排除了由于新物理来源而导致的包含性分支分数的大幅增强。

英文摘要:

We present measurements of partial branching fractions of $B \rightarrow K^+ X$, $B \rightarrow K^0 X$, and $B \rightarrow π^+ X$, where $X$ denotes any accessible final state above the endpoint for B decays to charmed mesons, specifically for momenta of the candidate hadron greater than 2.34 (2.36) GeV for kaons (pions) in the B rest frame. These measurements are sensitive to potential new-physics particles which could enter the $b \rightarrow s(d)$ loop transitions. The analysis is performed on a data sample consisting of $383 \times 10^6$ $B \bar{B}$ pairs collected with the BaBar detector at the PEP-II $e^+e^-$ asymmetric energy collider. Our results are in agreement with standard model predictions and exclude large enhancements of the inclusive branching fraction due to sources of new physics.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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