论文标题
2019/20课程$τ（ω_c^0）$ \＆$τ（ξ_c^0）$和{\ bf cp}在魅力衰减中的不对称性
2019/20 Lessons from $τ(Ω_c^0)$ \& $τ(Ξ_c^0)$ and {\bf CP} asymmetry in charm decays
论文作者
论文摘要
我们的2003年“ cicerone”讨论了具有不同方向和级别\ cite {cicerone}的魅力动力学。在这里，我们专注于两个项目，“风景”发生了很大变化。 （a）魅力hadron的寿命\＆半leptonic衰减显示了非扰动QCD的影响，以及在哪种程度上可以将重型夸克扩张（HQE）应用于魅力。正如我们从2019/20数据中学到的那样，它更加复杂。 （b）{\ bf cp}不对称已于2019年建立\ cite {lhcbguy}：$Δa_ {\ bf cp} \ equiv a _ _ {\ bf cp}（\ bf cp}（d^0 \^0 \ to k^+k^+k^ - ） - $ = $ \， - \，（1.54 \ pm 0.29）\ cdot 10^{ - 3} $是LHCB协作的成就！我们的社区正处于长期旅行的基本动态之际。 SM可以解释这些吗？我们讨论到2018年数据和2019/20年的新结论构成的假设。我们需要更多数据；但是，必须讨论不同过渡之间的相关性。我们给出了一个{\ bf附录}我们学到的大型{\ bf cp}在$ k_l \ toπ^+π^-e^-e^+e^ - $中所学的东西。
Our 2003 "Cicerone" had discussed charm dynamics with different directions and levels \cite{CICERONE}. Here we focus on two items, where the `landscape' has changed sizably. (A) The lifetimes \& semi-leptonic decays of charm hadrons show the impact of non-perturbative QCD and to which degree one can apply Heavy Quark Expansion (HQE) for charm hadrons. It is more complex as we have learnt from 2019/20 data. (B) {\bf CP} asymmetry has been established in 2019 \cite{LHCbGuy}: $ΔA_{\bf CP} \equiv A_{\bf CP}(D^0 \to K^+K^-) - A_{\bf CP}(D^0 \to π^+π^-) $=$\, -\, (1.54 \pm 0.29 ) \cdot 10^{-3}$ is quite an achievement by the LHCb collaboration! Our community is at the beginning of a long travel for fundamental dynamics. Can the SM account for these? We discuss the assumptions that were made up to 2018 data and new conclusions from 2019/20 ones. We need more data; however, one has to discuss correlations between different transitions. We give an {\bf Appendix} what we have learnt for large {\bf CP} asymmetry in $K_L \to π^+π^-e^+e^-$.
