{"paper":{"title":"Does the enhancement observed in $\\gamma\\gamma\\to D\\bar{D}$ contain two $P$-wave higher charmonia?","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex"],"primary_cat":"hep-ph","authors_text":"Dian-Yong Chen, Jun He, Takayuki Matsuki, Xiang Liu","submitted_at":"2012-07-16T01:33:25Z","abstract_excerpt":"Solved is a new puzzle raised by the observation of an enhancement structure Z(3930) in $\\gamma\\gamma\\to D\\bar{D}$. If categorizing Z(3930) as $\\chi_{c2}(2P)$ suggested by Belle and BaBar, we must explain why $\\chi_{c0}(2P)$ dominantly decaying into $D\\bar{D}$ is missing in the $D\\bar{D}$ invariant mass spectrum. In this work, we propose that the Z(3930) enhancement structure may contain two $P$-wave higher charmonia {$\\chi_{c0}(2P)$} and $\\chi_{c2}(2P)$. We show that this assumption is supported by our analysis of the $D\\bar{D}$ invariant mass spectrum and $\\cos\\theta^\\ast$ distribution of $\\"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1207.3561","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"}