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Based on the maximal CP violation hypothesis in the original Kobayashi-Maskawa (KM) scheme of neutrino mixing matrix, i.e., $\\delta_{\\rm KM}=90^\\circ$, we calculate $\\delta_{\\rm CK}$ for both quarks and leptons in the Chau-Keung (CK) scheme of the standard parametrization and find that $\\delta^{\\mathrm{quark}}_{\\mathrm{CK}}=(68.62^{+0.89}_{-0.81})^\\circ$ and $\\delta^{\\ma"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1204.6604","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2012-04-30T11:47:14Z","cross_cats_sorted":[],"title_canon_sha256":"db395aaec5bbb688d49ea4beb994dc2c717da60ab7f6a05c4e704bfb2b9c3d8b","abstract_canon_sha256":"68845c598d739fe23f672fa56b6140fabf3bae590dcb82401814e915e9a916a5"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:39:01.490393Z","signature_b64":"xtfe3fDyJrH+6Dn87R6t469ATpU+kzyAtzd/YwHcXwITQeWwKtywHWodd8EwLfa0b2b1SXSFg0ift5pCjCYCDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"453c2d6abb3e1a4b8db389f7ec9d2d8e55f1021d597a781606ae82913ecb47e0","last_reissued_at":"2026-05-18T02:39:01.489707Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:39:01.489707Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"On the CP-violating phase $\\delta_{\\rm CP}$ in fermion mixing matrices","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Bo-Qiang Ma, Xinyi Zhang","submitted_at":"2012-04-30T11:47:14Z","abstract_excerpt":"The recent established large $\\theta_{13}$ in neutrino mixing provides an optimistic possibility for the investigation of the CP violation, therefore it is necessary to study the CP-violating phase $\\delta_{\\rm CP}$ in detail. 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