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These operators are obtained from the weak pion-production amplitudes for the nucleon derived in the non-linear $\\sigma$-model together with weak excitation of the $\\Delta(1232)$ resonance and its subsequent decay into $N\\pi$. With these currents we compute the five 2p-2h response functions contributing to $(\\nu_l,l^-)$ and $(\\overline{\\nu}_l,l^+)$ reactions in the relativistic Fermi gas m"},"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":"1604.08423","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-th","submitted_at":"2016-04-28T14:03:36Z","cross_cats_sorted":["hep-ph"],"title_canon_sha256":"a0d838b712660cff71aa01914c1d35584e08cad6ed1c638b831edc64a341b492","abstract_canon_sha256":"d791a9d5458a462d1ab2499f75d05479c3b8d0487235f2ea81a1a6a6adf28145"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:44:01.160587Z","signature_b64":"ap9OdAgEDHf93LHMVcndaLIlTMSe6nGa3zQx6Adcvl99eoq7hYOTwiQrCaQzDN+fyxEe86gqAK7gKhdoglWTCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4cee8a6988a6b41b3c0e7bcba23af0408ef59338e712c0ddd10127f8988108fb","last_reissued_at":"2026-05-18T00:44:01.159889Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:44:01.159889Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Relativistic model of 2p-2h meson exchange currents in (anti)neutrino scattering","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ph"],"primary_cat":"nucl-th","authors_text":"A. 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