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This observable is helicity suppressed in the Standard Model, so that it is a sensitive probe of all Standard Model extensions that induce pseudoscalar currents and nonuniversal corrections to the lepton couplings. Ongoing experimental searches plan to reach uncertainties"},"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":"0910.2347","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2009-10-13T09:36:38Z","cross_cats_sorted":[],"title_canon_sha256":"208dadbb446aecba473f4c82e7118eb1f46f7fd3071786268ab4193e44d8dad3","abstract_canon_sha256":"257de8be4d1b718c4d2c2154126a14589cb6a65a0198f0cef42a84da189618d9"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:34:19.103915Z","signature_b64":"xDmkSJ64ILEQ3/CuJhaFmo9So3cm37/Gt4oSU0L25IgwkZEdgqzvhYG/nqu/1OYCFTp4RHQbutaO7rWZUCx4BA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"9634fb0e965dc81f9ba552faacfd3ff38fc3596f133909d9584fdc57807bce70","last_reissued_at":"2026-05-18T02:34:19.103466Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:34:19.103466Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The Standard model prediction for K(e2)/K_(mu2) and pi(e2)/pi(mu2)","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Ignasi Rosell","submitted_at":"2009-10-13T09:36:38Z","abstract_excerpt":"We have calculated the ratios $R_{e/\\mu}^{(P)} \\equiv \\Gamma(P \\to e \\bar{\\nu}_e [\\gamma])/ \\Gamma(P \\to \\mu \\bar{\\nu}_\\mu [\\gamma])$ ($P=\\pi,K$) in Chiral Perturbation Theory up to $\\mathcal{O}(e^2p^4)$, finding $R_{e/\\mu}^{(\\pi)} = (1.2352 \\pm 0.0001) \\times 10^{-4}$ and $R_{e/\\mu}^{(K)} = (2.477 \\pm 0.001) \\times 10^{-5}$. 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