Beane, Silas R.Luu, Thomas C.Orginos, KostasParreño García, AssumptaSavage, Martin J.Torok, AaronWalker-Loud, AndréNPLQCD Collaboration2019-04-052019-04-052008-01-141550-7998https://hdl.handle.net/2445/131685The I = 2 π π 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 π a I = 2 π π = − 0.043   30 ± 0.000   42 , where the error bar combines the statistical and systematic uncertainties in quadrature.12 p.application/pdfeng(c) American Physical Society, 2008Física de partículesInteraccions d'hadronsParticle physicsHadron interactionsinfo:eu-repo/semantics/article5886432019-04-05info:eu-repo/semantics/openAccess