The ππ scattering length from maximally twisted mass lattice QCD
نویسندگان
چکیده
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 mπa I=2 ππ = −0.04385 (28)(38) for the scattering length, where the first error is statistical and the second is our estimate of several systematic effects.
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