{"paper":{"title":"Measurement of the parity-violating longitudinal single-spin asymmetry for $W^{\\pm}$ boson production in polarized proton-proton collisions at $\\sqrt{s} = 500 $GeV","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"et al, The STAR Collaboration: M. M. Aggarwal","submitted_at":"2010-09-02T04:18:22Z","abstract_excerpt":"We report the first measurement of the parity violating single-spin asymmetries for midrapidity decay positrons and electrons from $W^{+}$ and $W^{-}$ boson production in longitudinally polarized proton-proton collisions at $\\sqrt{s}=500 $GeV by the STAR experiment at RHIC. The measured asymmetries, $A^{W^+}_{L}=-0.27\\pm 0.10\\;({\\rm stat.})\\pm 0.02\\;({\\rm syst.}) \\pm 0.03\\;({\\rm norm.})$ and $A^{W^-}_{L}=0.14\\pm 0.19\\;({\\rm stat.})\\pm 0.02 \\;({\\rm syst.})\\pm 0.01\\;({\\rm norm.})$, are consistent with theory predictions, which are large and of opposite sign. These predictions are based on polari"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1009.0326","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}