{"arxiv_id":"hep-lat/0506013","title":"I=2 pi-pi Scattering from Fully-Dynamical Mixed-Action Lattice QCD","abstract":"We compute the I=2 pi-pi scattering length at pion masses of m_pi ~ 294, 348 and 484 MeV in fully-dynamical lattice QCD using Luscher'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 ~ 0.125 fm. Chiral perturbation theory is used to perform the extrapolation of the scattering length from lattice quark masses down to the physical value, and we find m_pi a_2 = -0.0426 +- 0.0006 +- 0.0003 +- 0.0018, in good agreement with experiment. The I=2 pi-pi scattering phase shift is calculated to be delta = -43 +- 10 +- 5 degrees at |p| ~ 544 MeV for m_pi ~ 484 MeV.","primary_cat":"hep-lat","cross_cats":["hep-ph","nucl-th"],"submitted_at":"2005-06-10T18:16:17+00:00","latest_version":3,"source":"arxiv","source_label":"arXiv","source_url":null,"has_pdf":true,"has_source":false,"verdict":"CONDITIONAL","confidence":"HIGH","one_line_summary":"The I=2 pion-pion scattering length is computed on 2+1-flavor dynamical lattices at pion masses below 500 MeV and extrapolated to the physical point, giving m_pi a_2 = -0.0426 with a chiral-truncation error of 0.0018.","novelty_score":6.0,"correctness_risk":"medium","formal_verification":"none","upvotes":0,"downvotes":0,"pith_score":0.0,"inbound_count":23,"_links":{"html":"https://pith.science/paper/hep-lat/0506013","verdict":"/api/v1/verdicts/hep-lat/0506013"}}