Scalar K pi form factor and light quark masses

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dc.creatorJamin, M.
dc.creatorOller, J. A.
dc.creatorPich, A.
dc.date2006-05-09
dc.date2006-10-10
dc.date.accessioned2026-07-07T10:24:53Z
dc.date.available2026-07-07T10:24:53Z
dc.descriptionRecent experimental improvements on K-decay data allow for a precise extraction of the strangeness-changing scalar K pi form factor and the related strange scalar spectral function. On the basis of this scalar as well as the corresponding pseudoscalar spectral function, the strange quark mass is determined to be m_s(2 GeV) = 92 +- 9 MeV. Further taking into account chiral perturbation theory mass ratios, the light up and down quark masses turn out to be m_u(2 GeV) = 2.7 +- 0.4 MeV as well as m_d(2 GeV) = 4.8 +- 0.5 MeV. As a by-product, we also find a value for the Cabibbo angle |V_{us}| = 0.2236(29) and the ratio of meson decay constants F_K/F_π= 1.203(16). Performing a global average of the strange mass by including extractions from other channels as well as lattice QCD results yields m_s(2 GeV) = 94 +- 6 MeV.
dc.description5 pages, 2 figures; comparison with lattice and global average added; version to appear in Phys. Rev. D
dc.identifierhttps://arxiv.org/abs/hep-ph/0605095
dc.identifierhttp://arxiv.org/abs/hep-ph/0605095
dc.identifierPhys.Rev.D74:074009,2006
dc.identifierdoi:10.1103/PhysRevD.74.074009
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/176353
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectAstrophysics
dc.subjectHigh Energy Physics - Experiment
dc.subjectHigh Energy Physics - Lattice
dc.titleScalar K pi form factor and light quark masses
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