{"about":{"site":"https://codewithpapers.app","non_affiliation":"Code with Papers and Syntology are not affiliated with, endorsed by, or sponsored by Papers with Code, Meta, or the pwc-archive mirror.","licence":"CC BY-SA 4.0","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","attribution":"https://codewithpapers.app/attribution","modified":"archive material modified by Syntology; see the attribution page"},"url":"/paper/mixing-and-cp-violation-in-d-to-k-p-decays","title":"Mixing and $CP$ violation in $D^0 \\to K^- π^+$ decays","arxiv_id":"2106.02014","date":"2021-06-03","proceeding":null,"authors":["Tommaso Pajero","Michael Joseph Morello"],"abstract":"We review the experimental methods to measure mixing and time-dependent $C\\!P$ violation in $D^0$ decays into two hadrons. While these phenomena are usually neglected for $D^0 \\to K^- \\pi^+$ decays, this approximation is not always justified. In particular, it produces a bias on the measurement of the parameter $y_{CP}$, when this is performed by relying on $D^0 \\to K^- \\pi^+$ decays as a normalisation channel, whose size is around 40% of the precision of the current world average. Finally, we estimate the sensitivity to the weak mixing phases achievable by studying $D^0 \\to K^- \\pi^+$ and untagged $D \\to K^- \\pi^+$ decays, where $D$ stands for either of the $D^0$ and $\\bar{D}^0$ mesons. Contrary to Cabibbo-suppressed $D^0 \\to h^+ h^-$ decays, these decay channels allow to measure these phases without final-state dependent nuisance contributions from the decay amplitudes, but their sensitivity is lower by a factor of six.","url_abs":"https://arxiv.org/abs/2106.02014v3","url_pdf":"https://arxiv.org/pdf/2106.02014v3.pdf","source":{"archive":"pwc-archive (Hugging Face), CC BY-SA 4.0","snapshot":"2025-07-28","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","row_kind":"links_only","authors_date_abstract":"arXiv metadata, CC0 1.0 (https://info.arxiv.org/help/license), from the Kaggle arXiv metadata snapshot of 2026-09-12"},"code_links":[{"paper_slug":"mixing-and-cp-violation-in-d-to-k-p-decays","repo_url":"https://github.com/tpajero/charm-fitter","is_official":1,"mentioned_in_paper":1,"mentioned_in_github":0,"framework":"none","reach":null}],"tasks":[],"methods":[],"datasets_introduced":[],"methods_introduced":[],"results":[],"syntology":{"syntology_url":null,"atlas_url":null,"mcp":null,"developers":"https://syntology.ai/developers"},"arxiv_metadata":null,"syntology_extracted_results":null}