论文标题
$ b_q^0- \ bar b_q^0 $混合的新物理学：当前的挑战，前景和对$ b_q^0 \toμ^+μ^ - $
New Physics in $B_q^0-\bar B_q^0$ Mixing: Present Challenges, Prospects, and Implications for $B_q^0\toμ^+μ^-$
论文作者
论文摘要
$ b^0_q- \ bar b^0_q $混合的现象（$ q = d，s $）为超出标准模型以外的物理提供了敏感的探针。我们探索通过当前数据留下的新物理学的相应空间，仔细查看对$ b_q $混合参数的标准模型预测所需的单位三角形分析。特别是，我们探讨了CKM矩阵元素$ | v_ {ub} | $和$ | v_ {cb} | $之间紧张局势的影响。此外，我们专注于单位三角形的角度$γ$，将$ b \ dk $和$ b \ \ b \ w tosum p \ρπ$，$ρρ$衰减的测量值进行比较，通常用角度$α$来解释后者。我们讨论各种方案，并在$ b_q^0- \ bar b_q^0 $混音的新物理参数上介绍相应的最新约束。我们指出，这些结果在分析稀有$ b_q^0 \至μ^+μ^ - $衰减中具有有趣的应用，使我们能够最大程度地减少CKM参数在寻找新物理学时的影响。鉴于高精度时代，我们进行了未来的预测。有趣的是，我们发现，对于在$ b_d $系统中提取新物理参数的确定为单位三角形的顶点的确定导致关键限制因子。相比之下，相应的影响对于$ b_s $系统可以忽略不计，使其成为有前途的候选人揭示新物理学来源。
The phenomenon of $B^0_q-\bar B^0_q$ mixing ($q=d,s$) provides a sensitive probe for physics beyond the Standard Model. We explore the corresponding space for New Physics left through the current data, having a careful look at analyses of the Unitarity Triangle that are needed for the Standard Model predictions of the $B_q$ mixing parameters. In particular, we explore the impact of tensions between inclusive and exclusive determinations of the CKM matrix elements $|V_{ub}|$ and $|V_{cb}|$. Moreover, we focus on the angle $γ$ of the Unitarity Triangle, comparing measurements from $B\to DK$ and $B\toππ$, $ρπ$, $ρρ$ decays, where the latter are typically interpreted in terms of the angle $α$. We discuss various scenarios and present the corresponding state-of-the-art constraints on the New Physics parameters of $B_q^0-\bar B_q^0$ mixing. We point out that these results have an interesting application in the analysis of rare $B_q^0\to μ^+μ^-$ decays, allowing us to minimise the impact of CKM parameters in the search for New Physics. In view of the high-precision era, we make future projections. Interestingly, we find that for the extraction of the New Physics parameters in the $B_d$ system the determination of the apex of the Unitarity Triangle results in a key limiting factor. By contrast, the corresponding impact is negligible for the $B_s$ system, making it a promising candidate to reveal sources of New Physics.
