{"schema":"pubphys.bundle/1","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 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