2020/01/19 by S. Bianco, Bianco, S., I. I. Bigi +1
Medicine · Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #Medical Imaging Techniques and Applications #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.2001.06908
openalex publication_date 2020/01/19 · openalex created_date 2024/04/10 · openalex updated_date 2026/07/28
Our 2003 "Cicerone" had discussed charm dynamics with different directions and levels \citeCICERONE. 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 \citeLHCbGuy: ΔA\bf CP ≡ A\bf CP(D0 → K+K-) - A\bf CP(D0 → π+π-) = - (1.54 ± 0.29 ) ⋅ 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 KL → π+π-e+e-.