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arXiv 1207.4440hep-phhep-ex
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在类矢量夸克的味区寻找新物理

The Hunt for New Physics in the Flavour Sector with up vector-like quarks

F. J. Botella, G. C. Branco, M. Nebot

摘要:

我们分析了可能存在的新物理(NP)的风味部门,并评估其解决之间的紧张关系的实验值的$\AJPKs$和$\BTNu$相对于标准模型(SM)的期望的潜力。更新的模型独立的分析,其中NP的贡献是允许在Bd -反Bd和Bs -反Bs过渡,建议在$bd$部门的新物理的需要。最近的Flavour数据的详细分析,然后提出了一个简单的扩展的SM,其中一个$Q=2/3$矢量类等单线态夸克的SM的频谱的框架。特别强调的是,这个模型的各种可测量的量之间的相关性的影响。我们包括所有相关的夸克味部门的限制,并给出精确的预测,为选定的罕见过程。我们发现重要的偏差SM在$bd$部门的观测像半轻子不对称$\asld$,$B_{d}^{0}\to μ^{+}μ^{-}$和$A^s_{SL}-A^d_{SL}$。NP可能出现的其他潜在位置包括$A_{J/ΨΦ}$、$γ$、$K_{L}^{0}\to π^{0}ν\barν$、$t\to Zq$和$D^{0}\to μ^{+}μ^{-}$等。实验数据支持在这个模型中存在一个上矢量夸克,其质量低于$600(1000)$ GeV,在$1(2)$ $σ$。

英文摘要:

We analyse the possible presence of New Physics (NP) in the Flavour Sector and evaluate its potential for solving the tension between the experimental values of $\AJPKs$ and $\BTNu$ with respect to the Standard Model (SM) expectations. Updated model independent analyses, where NP contributions are allowed in Bd - anti-Bd and Bs - anti-Bs transitions, suggest the need of New Physics in the $bd$ sector. A detailed analysis of recent Flavour data is then presented in the framework of a simple extension of the SM, where a $Q=2/3$ vector-like isosinglet quark is added to the spectrum of the SM. Special emphasis is given to the implications of this model for correlations among various measurable quantities. We include constraints from all the relevant quark flavour sectors and give precise predictions for selected rare processes. We find important deviations from the SM in observables in the $bd$ sector like the semileptonic asymmetry $\asld$, $B_{d}^{0}\to μ^{+}μ^{-}$ and $A^s_{SL}-A^d_{SL}$. Other potential places where NP can show up include $A_{J/ΨΦ}$, $γ$, $K_{L}^{0}\to π^{0}ν\barν$, $t\to Zq$ and $D^{0}\to μ^{+}μ^{-}$ among others. The experimental data favours in this model the existence of an up vector-like quark with a mass below $600(1000)$ GeV at $1(2)$ $σ$.

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