{"paper":{"title":"Precise measurement of CP violating $\\tau$ EDM through $e^+ e^- \\to \\gamma^*, \\psi(2s) \\to \\tau^+ \\tau^-$","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["hep-ex"],"primary_cat":"hep-ph","authors_text":"Chang Yang, Chia-Wei Liu, Jian-Ping Ma, Xiao-Gang He, Zi-Yue Zou","submitted_at":"2025-01-12T02:35:20Z","abstract_excerpt":"A nonzero electric dipole moment of a tauon, $d_\\tau$, signals CP violation and provides an important probe for new physics. We study methods to measure $d_\\tau$ at low energy $e^+ e^-$ colliders through the processes $e^+e^- \\to \\gamma^*, \\psi(2S) \\to \\tau^+\\tau^-$ with $\\tau^\\pm$ decays into a charged hadron and a tau neutrino. We point out that, with measuring energies of the charged hadron, Im$(d_\\tau)$ can be measured. On the other hand, selecting events of $\\tau$ decays after traveling more than the detector resolution distance, Re$(d_\\tau)$ can also be determined. We find that the preci"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2501.06687","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2501.06687/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}