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arXiv 0804.1231hep-ph
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B -> phi pi衰变中的新物理学特征

Signature of new physics in B -> phi pi decay

B. Mawlong, R. Mohanta, A. K. Giri

摘要:

我们研究了额外的第四代夸克和FCNC介导的$Z$和$Z'$玻色子对稀有衰变模式$B^- \to ϕπ^-$的影响。在标准模型中,此模式仅接收$b \to d$企鹅贡献,因此,分支比$\sim 5 \times 10^{-9}$高度抑制。这反过来又使这种模式成为新物理学的一个非常敏感的探测器。我们发现,由于上述新的物理贡献,有一个显着的提高,其分支比。此外,直接CP破坏参数,这是相同的零,在SM中被发现是相当显着的。如果在即将到来的LHCb实验中观察到这种模式,它不仅可以提供新物理的明确信号,而且可以用来约束新的物理参数空间。

英文摘要:

We investigate the effect of an extra fourth quark generation and FCNC mediated $Z$ and $Z'$ bosons on the rare decay mode $B^- \to ϕπ^-$. In the standard model, this mode receives only $b \to d$ penguin contributions and therefore, highly suppressed with branching ratio $\sim 5 \times 10^{-9}$. This in turn makes this mode a very sensitive probe for new physics. We find that due to the above mentioned new physics contributions there is a significant enhancement in its branching ratio. Furthermore, the direct CP violation parameter which is identically zero in the SM is found to be quite significant. If this mode will be observed in the upcoming LHCb experiment, it will not only provide a clear signal of new physics but also can be used to constrain the new physics parameter space.

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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