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Precise Determination of the I=2 pipi Scattering Length from Mixed-Action Lattice QCD

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arxiv 0706.3026 v1 pith:3L6Z54XL submitted 2007-06-20 hep-lat hep-ph

Precise Determination of the I=2 pipi Scattering Length from Mixed-Action Lattice QCD

Silas R. Beane , Thomas C. Luu , Kostas Orginos , Assumpta Parreno , Martin J. Savage , Aaron Torok , Andre Walker-Loud This is my paper
classification hep-lat hep-ph
keywords pipichirallatticelengthmixed-actionquarksscatteringasqtad-improved
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The I=2 pipi scattering length is calculated in fully-dynamical lattice QCD with domain-wall valence quarks on the asqtad-improved coarse MILC configurations (with fourth-rooted staggered sea quarks) at four light-quark masses. Two- and three-flavor mixed-action chiral perturbation theory at next-to-leading order is used to perform the chiral and continuum extrapolations. At the physical charged pion mass, we find m_pi a_pipi(I=2) = -0.04330 +- 0.00042, where the error bar combines the statistical and systematic uncertainties in quadrature.

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