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Stanislaus, TWIST Collaboration: A. Hillairet, V. Selivanov, W. Faszer, Yu. I. Davydov","submitted_at":"2011-12-15T18:59:51Z","abstract_excerpt":"The TWIST Collaboration has completed its measurement of the three muon decay parameters \\rho, \\delta, and P_\\mu\\xi. This paper describes our determination of \\rho, which governs the shape of the overall momentum spectrum, and \\delta, which controls the momentum dependence of the parity-violating decay asymmetry. The results are \\rho=0.74977\\pm 0.00012(stat.)\\pm 0.00023(syst.) and \\delta = 0.75049\\pm 0.00021(stat.)\\pm 0.00027(syst.). These are consistent with the value of 3/4 given for both parameters in the standard model, and each is over a factor of 10 more precise than the measurements pub"},"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":"1112.3606","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2011-12-15T18:59:51Z","cross_cats_sorted":[],"title_canon_sha256":"60ec1a0fcf537440d1c9d5821b71812f835b18dcb5ef2828819e638c5a784ba3","abstract_canon_sha256":"22a7bb6d360523c01aaa614aec2ec0b2c5913ba836305b04f74e55a857c406b5"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:54:47.742974Z","signature_b64":"bLQTvJIatX7wGNMBDUnhRQiFyzfUeEOaqifZPrgDiXg9nTb2cADJ2W3cL7cyDP6xDZSiI+xCF+8KbrXIDvRlDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0e4441031bf0403f80fa4bb9548062e802885adbd660224c36063f0d62039558","last_reissued_at":"2026-05-18T03:54:47.742285Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:54:47.742285Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Precision muon decay measurements and improved constraints on the weak interaction","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"A. 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