{"paper":{"title":"Identified hadron compositions in p+p and Au+Au collisions at high transverse momenta at $\\sqrt{s_{_{NN}}} = 200$ GeV","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"nucl-ex","authors_text":"STAR Collaboration","submitted_at":"2011-10-04T04:54:35Z","abstract_excerpt":"We report transverse momentum ($p_{T}\n  \\leq15$ GeV/$c$) spectra of $\\pi^{\\pm}$, $K^{\\pm}$, $p$, $\\bar{p}$, $K_{S}^{0}$, and $\\rho^{0}$ at mid-rapidity in p+p and Au+Au collisions at $\\sqrt{s_{_{NN}}}$ = 200 GeV. Perturbative QCD calculations are consistent with $\\pi^{\\pm}$ spectra in p+p collisions but do not reproduce $K$ and $p(\\bar{p})$ spectra. The observed decreasing antiparticle-to-particle ratios with increasing $p_T$ provide experimental evidence for varying quark and gluon jet contributions to high-$p_T$ hadron yields. The relative hadron abundances in Au+Au at $p_{T}{}^{>}_{\\sim}8$ "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1110.0579","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"}