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arXiv 0906.4016hep-ex
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LHCb测量$B_{s}\toμμ$分支比的展望

Prospect for measuring the branching ratio of $B_{s}\toμμ$ at LHCb

Elias Lopez Asamar

摘要:

标准模型预测衰变模式Bs -> mu mu的分支比为(3.4 +/- 0.5)10 e-9,而一些超对称模型预测增强高达2个数量级。预计在其寿命结束时,Tevatron将为10 e-8的数量级的该分支比设定排除极限,留下一个数量级以供探索。LHCb探测器出色的顶点重建、不变质量分辨率和μ子识别使其非常适合在LHC运行的最初几年内观察这个范围内的分支比。在这篇文章中,概述了已开发的测量这种分支比的分析。事件选择和统计工具用于提取的分支比进行了讨论。一个特殊的压力是把控制通道的使用校准和归一化,以使分析尽可能独立的模拟。最后,给出了一组积分亮度值在排除和观测意义方面的预期性能。

英文摘要:

The Standard Model predicts a branching ratio for the decay mode Bs -> mu mu of (3.4 +/- 0.5)10e-9, while some SUSY models predict enhancements up to 2 orders of magnitude. It is expected that at the end of its life Tevatron will set and exclusion limit for this branching ratio of the order of 10e-8, leaving one order of magnitude to explore. The excellent vertex reconstruction, invariant mass resolution and muon identification of the LHCb detector make it well suited to observe a branching ratio in this range in the first years of running of LHC. In this article an overview of the analysis that has been developed for the measurement of this branching ratio is presented. The event selection and the statistical tools used for the extraction of the branching ratio are discussed. A special stress is put on the use of control channels for calibration and normalization in order to make the analysis as independent of simulation as possible. Finally, the expected performance in terms of exclusion and observation significance are given for a set of values of integrated luminosities.

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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