Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2009-09-17
Phys.Lett.B684:268-274,2010
Physics
High Energy Physics
High Energy Physics - Lattice
19 pages, 3 figures. v2: reference added, minor changes in language, to appear in Phys. Lett. B
Scientific paper
10.1016/j.physletb.2010.01.018
We calculate the s-wave pion-pion scattering length in the isospin I=2 channel in lattice QCD for pion masses ranging from 270 Mev to 485 Mev using two flavors of maximally twisted mass fermions at a lattice spacing of 0.086 fm. Additionally, we check for lattice artifacts with one calculation at a finer lattice spacing of 0.067 fm. We use chiral perturbation theory at next-to-leading order to extrapolate our results. At the physical pion mass, we find m_pi a_pipi(I=2)=-0.04385(28)(38) for the scattering length, where the first error is statistical and the second is our estimate of several systematic effects.
Feng Xu
Jansen Karl
Renner Dru B.
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