arXiv 1407.09162014-07-03hep-phhep-ex

用$B^0_s\to μ^+μ^-$探索新物理：现状与展望

Probing New Physics with $B^0_s\to μ^+μ^-$: Status and Perspectives

Robert Fleischer

备注：: 14 pages, 6 figures, invited talk at the International Conference on Flavor Physics and Mass Generation, Singapore, 10-14 February 2014, to appear in the Proceedings
发表信息：: Int. J. Mod. Phys. A29, 1444004 (2014)
DOI：: 10.1142/S0217751X14440047

摘要：

稀有衰变$B^0_s \to μ^+μ^-$对标准模型的检验起着关键作用。指出了$B_s$ -介子系统中相当大的衰变宽度差$ΔΓ_s$对该通道的影响是微妙的。因此，其计算的标准模型分支比必须放大约10%。此外，相当大的$ΔΓ_s$通过有效的$B^0_s\to μ^+μ^-$寿命使一个新的可观察性，它以一种与分支比互补的方式探索新物理学，并为LHC的高光度升级议程增加了一个令人兴奋的新课题。CP破坏速率不对称性为新物理学提供了进一步的探索。这些观测值和$B^0_s \to μ^+μ^-$分支比之间的相关性说明了新物理学的特定模型。

英文摘要：

The rare decay $B^0_s \to μ^+μ^-$ plays a key role for the testing of the Standard Model. It is pointed out that the sizable decay width difference $ΔΓ_s$ of the $B_s$-meson system affects this channel in a subtle way. As a consequence, its calculated Standard Model branching ratio has to be upscaled by about 10%. Moreover, the sizable $ΔΓ_s$ makes a new observable through the effective $B^0_s\to μ^+μ^-$ lifetime accessible, which probes New Physics in a way complementary to the branching ratio and adds an exciting new topic to the agenda for the high-luminosity upgrade of the LHC. Further probes of New Physics are offered by a CP-violating rate asymmetry. Correlations between these observables and the $B^0_s \to μ^+μ^-$ branching ratio are illustrated for specific models of New Physics.

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