{"paper":{"title":"Coherent $\\psi$(2S) photo-production in ultra-peripheral Pb-Pb collisions at $\\sqrt{s}_{\\rm NN}$ = 2.76 TeV","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["hep-ex"],"primary_cat":"nucl-ex","authors_text":"ALICE Collaboration","submitted_at":"2015-08-20T19:24:45Z","abstract_excerpt":"We have has performed the first measurement of the coherent $\\psi$(2S) photo-production cross section in ultra-peripheral Pb-Pb collisions at the LHC. This charmonium excited state is reconstructed via the $\\psi$(2S) $\\rightarrow l^{+}l^{-}$ and $\\psi$(2S) $\\rightarrow$ J/$\\psi \\pi^{+}\\pi^{-}$ decays, where the J/$\\psi$ decays into two leptons. The analysis is based on an event sample corresponding to an integrated luminosity of about 22 $\\mu\\rm{b}^{-1}$. The cross section for coherent $\\psi$(2S) production in the rapidity interval $-0.9<y<0.9$ is $\\mathrm{d}\\sigma_{\\psi{\\rm(2S)}}^{\\rm coh}/\\m"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1508.05076","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"}