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Lubicz","submitted_at":"2009-04-06T15:23:52Z","abstract_excerpt":"We present the results of a lattice QCD calculation of the pseudoscalar meson decay constants fpi, fK, fD and fDs, performed with Nf=2 dynamical fermions. The simulation is carried out with the tree-level improved Symanzik gauge action and with the twisted mass fermionic action at maximal twist. We have considered for the final analysis three values of the lattice spacing, a~0.10 fm, 0.09 fm and 0.07 fm, with pion masses down to mpi~270 MeV. Our results for the light meson decay constants are fK=158.1(2.4) MeV and fK/fpi=1.210(18).\n  From the latter ratio, by using the experimental determinati"},"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":"0904.0954","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-lat","submitted_at":"2009-04-06T15:23:52Z","cross_cats_sorted":["hep-ph"],"title_canon_sha256":"225c29943f136e5cd613667c68ea989f9e7cadad1be4c526aa5a3bfd5661dc35","abstract_canon_sha256":"b22a854a046c655d1632bc7c56e8d50e6e9db6c4a2854f9a1c42ff994892b414"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:33:16.071193Z","signature_b64":"Nx2QVwfR/1lae98myjcrgEr1qBdTEkMQXBYmBPFpS6ZFMJtVOR/WEnduUzGKS5sCAfaz+oTA8qfzIQkQypPNCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8f5e240432adc1759e894fdc47096e50005383afc09c5d67efd0afbcd9cc399a","last_reissued_at":"2026-05-18T04:33:16.070678Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:33:16.070678Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Pseudoscalar decay constants of kaon and D-mesons from Nf=2 twisted mass Lattice QCD","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ph"],"primary_cat":"hep-lat","authors_text":"A. 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