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Simulations are performed on 16^3x32x16 and 24^3x64x16 lattices with three values of the light quark mass, allowing for an extrapolation to the chiral limit. After interpolating to zero momentum transfer, we obtain the preliminary result f_+^{K\\pi}(0)=0.9609(51) (or \\Delta f = -0.0161(51)), which is in agreement with the result of Leutwyler & Roos."},"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":"hep-lat/0702026","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"hep-lat","submitted_at":"2007-02-27T18:09:32Z","cross_cats_sorted":["hep-ph"],"title_canon_sha256":"31deea46356d84ffa061f1c0a01cda270d4791e6f085b999c9023a7d5430176c","abstract_canon_sha256":"81eb4b8c22efbb8969770466c084e0b84ab2863b556ebc33b5a77e70c60994ef"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T14:59:48.136788Z","signature_b64":"YDlVTdXVu7IrnDLqUV8bWwsuj1fPSgEK7R5sPlm19JObcJode9pXo2m46s/4xuu5+5DhhqwXKKh0GAhSuDWWDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2ca280be065538e32bac42b17d140bee9d6b849dfe0a396102af8521735d72e1","last_reissued_at":"2026-07-04T14:59:48.136403Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T14:59:48.136403Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"K_l3 form factor with N_f=2+1 dynamical domain wall fermions: A progress report","license":"","headline":"","cross_cats":["hep-ph"],"primary_cat":"hep-lat","authors_text":"A. 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