m_u+m_d From Isovector Pseudoscalar Sum Rules

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dc.creatorMaltman, Kim
dc.creatorKambor, Joachim
dc.date2001-07-06
dc.date.accessioned2026-07-07T10:32:52Z
dc.date.available2026-07-07T10:32:52Z
dc.descriptionWe revisit the isovector pseudoscalar sum rule determination of m_u+m_d, using families of finite energy sum rules known to be very accurately satisfied in the isovector vector channel. The sum rule constraints are sufficiently strong to allow a determination of both m_u+m_d and the excited resonance decay constants. The corresponding Borel transformed sum rules are also very well satisfied, providing a non-trivial consistency check on the treatment of direct instanton contributions. We obtain [m_u+m_d](2 GeV)=7.8\pm 1.1 MeV (in the MS bar scheme), only marginally compatible with the most recent sum rule determinations, but in good agreement with recent unquenched lattice extractions.
dc.description15 pages, 6 figures
dc.identifierhttps://arxiv.org/abs/hep-ph/0107060
dc.identifierhttp://arxiv.org/abs/hep-ph/0107060
dc.identifierPhys.Lett.B517:332-338,2001
dc.identifierdoi:10.1016/S0370-2693(01)00987-X
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/178909
dc.subjectHigh Energy Physics - Phenomenology
dc.titlem_u+m_d From Isovector Pseudoscalar Sum Rules
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