论文标题
用$ b \ tokμ^+μ^ - $ $ b \ $ $^ - $的指纹cp-violating新物理
Fingerprinting CP-violating New Physics with $B \to Kμ^+μ^-$
论文作者
论文摘要
$ b \ to k \ ell^+ \ ell^ - $系统特别有趣，可以探索超出标准模型的物理。这种影响可能会提供新的违反CP的来源，从而产生Wilson系数，这不仅是真实的，正如大多数分析中所假定的，而且很复杂。我们提出了一种新策略，以从数据中提取复杂的$ c_ {9μ} $，$ c_ {10μ} $，利用$ b^+\ in $ b^+\ to k^+μ^+μ^ - $和混合诱导的cp侵犯的互补性，除了直接cp违规而出现cp aft cp aft cp aft -b^0_d} μ^+μ^ - $，以及适当的$ q^2 $ bin的差异速率。由于其非扰动性质，无法可靠地计算出产生直接CP不对称性的长距离效应，从而起着关键作用。为了描述它们，我们使用实验数据采用LHCB协作的模型。假设有特定的情况，我们证明了CP侵略新物理学的指纹以及长距离贡献模型中的歧义之间的区别。最后，正如Lepton风味普遍性$ r_k $所探测的那样，新物理学可能与MUON和电子不同。我们在存在CP违规的情况下讨论了这些效果，并提出了一种新的方法来测量$ b \ to k e^+ e^ - $通道的直接CP不对称。
The $B \to K \ell^+ \ell^-$ system is particularly interesting to explore physics beyond the Standard Model. Such effects could provide new sources of CP violation, thereby giving rise to Wilson coefficients which could not only be real, as assumed in most analyses, but also be complex. We propose a new strategy to extract the complex $C_{9 μ}$, $C_{10 μ}$ from the data, utilising the complementarity of direct CP violation in $B^+\to K^+ μ^+μ^-$ and mixing-induced CP violation arising - in addition to direct CP violation - in $B^0_d \to K_{S} μ^+μ^-$, as well as the differential rate in appropriate $q^2$ bins. The long-distance effects, which play a key role to generate the direct CP asymmetries, cannot be reliably calculated due to their non-perturbative nature. In order to describe them, we apply a model by the LHCb Collaboration employing experimental data. Assuming specific scenarios, we demonstrate the fingerprinting of CP-violating New Physics and the distinction between ambiguities in the model of the long-distance contributions. Finally, New Physics could couple differently to muons and electrons, as probed through the lepton flavour universality ratio $R_K$. We discuss these effects in the presence of CP violation and present a new way to measure the direct CP asymmetries of the $B \to K e^+ e^-$ channels.
