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

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

2007-06-20

arxiv.org/abs/0706.3026v1

Phys.Rev.D77:014505,2008

Physics

High Energy Physics

High Energy Physics - Lattice

20 pages, 7 figures

Scientific paper

10.1103/PhysRevD.77.014505

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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