{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"395df6c013c833f5f7f294623e71d4489239e3bdd0ce697e3fef71215a29eb6f","created":"2026-10-03T07:18:07Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"00983f8d89e86dc387585e5d26ce51a660ea3ccfe71309db9d45c13f5892ff3c","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"identification","assisted_by":[],"external_id":"nuc.exotic-hadrons.scalar-glueball","kind":"phenomenon","literature_status":"contested","n":"1","parents":[],"plain":"QCD predicts particles made only of gluons, called glueballs, with the lightest near 1.7 GeV. It mixes with ordinary quark-antiquark states, and which observed particles contain it is disputed.","posed_since":"","precise":"Quenched lattice QCD places the $0++$ glueball near $1.7\\,\\mathrm{GeV}$. Among $f0(1370)$, $f0(1500)$, $f0(1710)$ and $f0(1770)$, determine the glueball content (mixing fractions with $n-\\mathrm{nbar}$ and $s-\\mathrm{sbar}$), using $J/\\psi$ radiative decays, two-photon widths, decay branching ratios and lattice QCD with dynamical quarks. Answer: a mixing scheme consistent with all production and decay data.","problem_ref":null,"references":"","settled_by":"Lattice QCD scattering calculation of the isoscalar scalar channel with glueball operators at physical quark masses, combined with coupled-channel fits to BESIII and LHCb data.","status_note":"Coupled-channel analyses of BESIII radiative $J/\\psi$ decay data (around 2021-2022) assigned the largest glueball fraction to states near $1.7\\ \\text{to}\\ 1.9\\,\\mathrm{GeV}$, with amplitude-model dependence unresolved as of 2026.","title":"Which observed scalar mesons contain the lightest glueball?","topic_ref":"0a95c0555eb6bb05e3999da7d5dca17d55ffdaf922ee81ba9f8dcd197324eda0"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"7b639052d77d017fd830ac815036f240c2089ac75d4505d1bdc27afa0a0ec3a6","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"c737d3e3abab8195dfb773949fe9007d3b00beb639cb8569168cc11801be9657","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"KXfPPjfXvx2H_j7AnB6mAAIck0l8Az_5fHv-wBwRx369LnY8qNWj0GOJRCUyYbp1s5xlcxWfi9SnZt9Gh0u5Aw"},"schema":"pubphys.envelope/1"},"record_hash":"7b639052d77d017fd830ac815036f240c2089ac75d4505d1bdc27afa0a0ec3a6","leaf_index":1749}