{"paper":{"title":"Recent results from PHENIX on double helicity asymmetry ($A_{LL}$) measurement at $\\sqrt{s}$ = 510 GeV","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["nucl-ex"],"primary_cat":"hep-ex","authors_text":"H. Guragain","submitted_at":"2015-12-12T22:36:39Z","abstract_excerpt":"One of the major objectives of the RHIC spin program at BNL is the measurement of the gluon helicity contribution, $\\Delta G$, to the proton spin via measuring the double longitudinal spin asymmetry ($A_{LL}$) in various channels. In PHENIX (Pioneering High Energy Nuclear Interaction eXperiment) the $A_{LL}$ in $\\pi^{0}$, $\\eta$, $J/\\psi$ etc. are measured in wide rapidity range. In this talk, $A_{LL}$ in $\\pi^{0}$ production in central rapidity and $J/\\psi$ production in forward rapidity will be discussed. The $\\pi^{0}$ is reconstructed through its diphoton decay channel within the rapidity r"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1512.03969","kind":"arxiv","version":1},"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"}