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Title: Meson-baryon scattering lengths from mixed-action lattice QCD
Author: Torok, Aaron
Beane, Silas R.
Detmold, William
Luu, Thomas C.
Orginos, Kostas
Parreño García, Assumpta
Savage, Martin J.
Walker-Loud, André
NPLQCD Collaboration
Keywords: Física de partícules
Particle physics
Issue Date: 26-Apr-2010
Publisher: American Physical Society
Abstract: The π + Σ + , π + Ξ 0 , K + p , K + n , and ¯¯¯¯ K 0 Ξ 0 scattering lengths are calculated in mixed-action Lattice QCD with domain-wall valence quarks on the asqtad-improved coarse MILC configurations at four light-quark masses, and at two light-quark masses on the fine MILC configurations. Heavy-baryon chiral perturbation theory with two and three flavors of light quarks is used to perform the chiral extrapolations. To the order we work in the three-flavor chiral expansion, the kaon-baryon processes that we investigate show no signs of convergence. Using the two-flavor chiral expansion for extrapolation, the pion-hyperon scattering lengths are found to be a π + Σ + = − 0.197 ± 0.017     fm , and a π + Ξ 0 = − 0.098 ± 0.017     fm , where the comprehensive error includes statistical and systematic uncertainties.
Note: Reproducció del document publicat a:
It is part of: Physical Review D, 2010, vol. 81, num. 7, p. 074506
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ISSN: 1550-7998
Appears in Collections:Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))
Articles publicats en revistes (Física Quàntica i Astrofísica)

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