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<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>I</mml:mi><mml:mo>=</mml:mo><mml:mn>2</mml:mn></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>π</mml:mi><mml:mi>π</mml:mi></mml:math>scattering from fully-dynamical mixed-action lattice QCD
We compute the $I=2$ $\ensuremath{\pi}\ensuremath{\pi}$ scattering length at pion masses of ${m}_{\ensuremath{\pi}}\ensuremath{\sim}294$, 348, and 484 MeV in fully-dynamical lattice QCD using L\"uscher's finite-volume method. The calculation is performed with domain-wall valence-quark propagators on asqtad-improved MILC configurations with staggered sea quarks at a single lattice spacing, $b\ensuremath{\sim}0.125\text{ }\text{ }\mathrm{fm}$. Chiral perturbation …