{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"cd89dad99eab7e12e8a770483d59336441a9881fbb317a924ab4fe02b8d23737","created":"2026-10-03T07:18:07Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"5d0334cad87b1de7b63f57f064300165bd2387b2798bb81b33a648a7b9f6a638","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"nuc.quark-gluon-plasma.jet-quenching-small-systems","kind":"well-posed","literature_status":"partially-resolved","n":"1","parents":[],"plain":"In large collisions, fast quarks lose energy crossing the plasma, which suppresses high-momentum particles. This suppression has now been seen in collisions of oxygen nuclei, but whether it also occurs when a proton hits a nucleus, or when two protons collide, is not established.","posed_since":"","precise":"Measure the nuclear modification factor $R_{\\mathrm{AA}}(p_T)$ and semi-inclusive recoil-jet yields in p-Pb and high-multiplicity pp collisions at the LHC, and determine whether final-state energy loss is present at 5 or more standard deviations beyond nuclear-PDF and event-selection biases; quantify the O+O energy loss with the p-O reference. Answer: yes or no for p-Pb and pp, and the energy-loss magnitude versus system size.","problem_ref":null,"references":"","settled_by":"Semi-inclusive recoil-jet and photon- or Z-boson-tagged jet measurements in p-Pb, p-O and high-multiplicity pp with event-activity biases controlled, compared with the O+O results.","status_note":"CMS observed an $R_{AA}$ minimum of $0.69 \\pm 0.04$ near $p_{T} = 6\\,\\mathrm{GeV}$ in $O+O$ at $5.36\\,\\mathrm{TeV}$ (arXiv 2510.09864, published 2026) and STAR reported about 20 percent jet suppression in $O+O$ at $200\\,\\mathrm{GeV}$ (arXiv 2604.13935, 2026); no significant final-state suppression had been established in p-Pb or pp as of 2026.","title":"Do jets lose energy in proton-nucleus and high-multiplicity proton collisions?","topic_ref":"ec5bb29d3c4ec6576273c8009fdd00011a21f5672430b3080013ab67a0a1a41c"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"6aeda70407c1c8f5e4e24b2f0fb1fc81e19978f6b75ec4ed9228f25654342dd4","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"6f920f5c8aab4efdf15c27e2dd71771c6733a28a6063bf37e37d4e2d78870cfe","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"9xhZsQ5KBt-C6EQwEqwntUsgngoQcmKyJ3U7CNI422Z1_vSSHsU2QFfIHY0JxqKtE3OdKz7lHqnja9PoDyglCA"},"schema":"pubphys.envelope/1"},"record_hash":"6aeda70407c1c8f5e4e24b2f0fb1fc81e19978f6b75ec4ed9228f25654342dd4","leaf_index":1804}