{"paper":{"title":"Understanding the cross section of $e^+e^-\\to \\eta J/\\psi$ process via nonrelativistic QCD","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex"],"primary_cat":"hep-ph","authors_text":"Cong-Feng Qiao, Rui-Lin Zhu","submitted_at":"2014-03-08T01:53:49Z","abstract_excerpt":"Motivated by the large cross section of $e^+e^-\\to \\eta J/\\psi$ process measured by the BESIII and Belle Collaborations recently, we evaluate this process at $\\mathcal{O}(\\alpha_s^4)$ accuracy in the framework of nonrelativistic QCD. We find that the cross section at the center-of-mass energy $\\sqrt{s}=4.009$ {GeV} is $34.6\\mathrm{pb}$, which is consistent with the BESIII data. The comparison with the Belle data in the region from $4.0\\ \\mathrm{GeV}$ to $5.3\\ \\mathrm{GeV}$ is also presented. Concerning the $\\eta$ and $\\eta^\\prime$ mixing and the potential gluonium component of $\\eta^\\prime$, w"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1403.1918","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"}