{"id":"5a9a99c5-c50f-4b03-9835-7de7275b41dd","arxiv_id":"2608.02874","paper_version":1,"verdict":"CONDITIONAL","confidence":"MODERATE","novelty_score":6.0,"correctness_risk":"medium","formal_verification":"none","parameter_count":1,"one_line_summary":"First OO strange-hadron data at 5.36 TeV show yield ratios scale with multiplicity, but mean transverse momentum tracks Pb-Pb more than pp.","lead":"ALICE reports the first strangeness measurements in oxygen-oxygen collisions at the LHC, showing how strange hadron yields and momentum spectra change with collision centrality. The results suggest that collision size and geometry matter beyond simple particle multiplicity, and they challenge current event generators.","discovery_kind":"new_application","skeptic_critique":{"model":"deepseek-v4-flash","headline":"Energy mismatch (5.36 vs 5.02 TeV) in the OO-to-pp/Pb-Pb comparison is not corrected or quantified; it could create the apparent Pb-Pb-like <pT> evolution in Fig. 2.","rationale":"I agree with the reader's weakest_assumption. The OO-vs-other comparison is the empirical basis for the strongest claim, and it rests on a direct juxtaposition of points at different collision energies. In the absence of any energy-dependence discussion, the conclusion is at least partially confounded: the higher OO beam energy shifts <pT> upward and could make OO look more Pb-Pb-like than it would at 5.02 TeV. The likely objection is that 0.34 TeV on a 5 TeV scale is small, but <pT> depends logarithmically on energy and the claimed OO/Pb-Pb closeness is a visual statement, so a few-percent shift could matter if the system-size separation is of similar size. The proposed rescaling test would settle this. The reader's CONDITIONAL verdict is appropriate; my concern reinforces it rather than moving it, so the verdict should remain UNCHANGED. I see no internal inconsistency or unsupported circularity: the measurement is a legitimate ALICE preliminary, and model comparisons are external. The lack of data tables and the preliminary status are secondary reproducibility limitations, not the decisive flaw. The decisive remaining risk after the energy check would be the absence of a statistical comparison of 'closeness,' but the energy mismatch is the most directly load-bearing issue for the central claim.","tokens_in":4263,"tokens_out":7070,"duration_ms":67673,"concrete_test":"Use published ALICE pp energy-dependent <pT> measurements at 5.02 and 13 TeV (or Pythia8 Angantyr simulations for OO at 5.02 and 5.36 TeV) to estimate the expected <pT> shift for K0S, Lambda, Xi, and Omega at fixed multiplicity between sqrt(s_NN)=5.02 and 5.36 TeV. Apply this shift to the 5.02 TeV reference points, or subtract it from the OO points, and recompute the OO-to-pp and OO-to-Pb-Pb separations in Fig. 2 over the common multiplicity range. If the OO points no longer lie closer to Pb-Pb than to pp, or if the inferred shift is large compared with the OO-Pb-Pb gap, the Sec. 2.1 conclusion is not established.","verdict_should_be":"UNCHANGED","load_bearing_attack":"The central claim in Sec. 2.1 (final paragraph and Fig. 2) is that OO <pT> at sqrt(s_NN)=5.36 TeV follows the Pb-Pb trend rather than the pp/p-Pb trend at comparable multiplicities, implying system-size-dependent dynamics. This comparison is made against pp, p-Pb, and Pb-Pb data at 5.02 TeV. The 0.34 TeV (about 6.8%) energy difference is not mentioned as a caveat and no correction is applied. Mean transverse momentum increases with collision energy at fixed multiplicity in pp, where ALICE has measured a monotonic rise over 0.9 to 13 TeV, so the OO points are shifted upward by an unknown energy-dependent amount. If that shift is comparable to the OO-Pb-Pb separation shown in the figure, the direct comparison would be biased in the direction of the paper's conclusion. The text also provides no quantitative measure of 'follows more closely the Pb-Pb trend' (for example, a slope comparison or chi-square over the overlapping multiplicity interval), so statistical significance cannot be assessed. Thus the load-bearing assumption that the 340 GeV beam-energy difference is dynamically negligible is unsupported.","agreement_with_reader":"agree"},"referee_report":{"model":"deepseek-v4-flash","summary":"This conference proceedings contribution reports the first ALICE measurements of (multi-)strange hadron production in oxygen–oxygen (OO) collisions at sqrt(s_NN) = 5.36 TeV as a function of charged-particle multiplicity. The paper presents pT-differential spectra of K0S, the (Lambda+anti-Lambda)/(2K0S) ratio as a function of pT for different centrality classes, the mean transverse momentum <pT> versus charged-particle multiplicity for K0S, Lambda, Xi, and Omega, and pT-integrated yield ratios to 2K0S. These OO results are compared with pp, p-Pb, and Pb-Pb data at sqrt(s_NN) = 5.02 TeV and with model predictions from Pythia8 Angantyr and Ropes. The central claim is that while the integrated yield ratios scale smoothly with multiplicity across systems, the <pT> evolution in OO follows the Pb-Pb trend more closely than the small-system trend, indicating that similar final-state multiplicities do not necessarily imply the same particle-production dynamics.","tokens_in":4456,"tokens_out":3119,"duration_ms":28018,"significance":"If the central claim holds, these OO data provide a valuable bridge between small and large collision systems and offer new constraints on models of spectral hardening and strangeness production. Strengths of the paper include the use of standard ALICE invariant-mass reconstruction with explicit statistical and systematic uncertainties, the presentation of first OO results in an intermediate-size system, and the comparison with external Monte Carlo predictions that are not fitted to the data. The main limitation is the direct comparison of OO at 5.36 TeV with data at 5.02 TeV without any correction for the beam-energy difference, which directly affects the load-bearing conclusion about the <pT> trend. The paper is a concise proceedings contribution, and the claims are plausible but not yet fully supported quantitatively.","major_comments":[{"comment":"The central dynamical claim rests on comparing OO <pT> at sqrt(s_NN) = 5.36 TeV with pp, p-Pb, and Pb-Pb data at 5.02 TeV. The 340 MeV (about 6.8%) energy difference is not corrected or discussed. Since <pT> is known to increase with collision energy at fixed multiplicity, the OO points are shifted upward by an unknown amount that is in the direction of the paper's conclusion. Quantify this effect (e.g., by rescaling the 5.02 TeV reference data using an energy-dependent parameterization or by showing that the shift is negligible) or soften the claim that OO 'follows more closely the Pb-Pb trend.'","section":"2.1, Fig. 2"},{"comment":"The statement that the OO evolution 'follows more closely the Pb-Pb trend' is made without a quantitative measure. Provide a fit of <pT> versus <dNch/deta> over the overlapping multiplicity interval (e.g., slopes with uncertainties and chi2/ndf) for OO, pp, p-Pb, and Pb-Pb, so that the statistical significance of the claimed similarity can be assessed.","section":"2.1, Fig. 2"}],"minor_comments":[{"comment":"In the abstract, the collision energy is written as 'sqrt(s) = 5.36 TeV'; it should be 'sqrt(s_NN) = 5.36 TeV' to be consistent with the rest of the text.","section":"Abstract"},{"comment":"The centrality labels in the lower left panel, e.g., '100%−0', are unconventional; consider using '0–100%' and ordering the centralities consistently.","section":"Fig. 1"},{"comment":"The paper refers to the data as 'ALICE Preliminary' in the figures but does not mention this in the text or abstract; this should be stated explicitly in the text.","section":"2.1"},{"comment":"The phrase 'unprecedented opportunity' is editorial; 'opportunity' would be more neutral and appropriate for a proceedings paper.","section":"Introduction"}],"recommendation":"major_revision","confidential_remarks":"The manuscript is a conference proceedings contribution with a promising first measurement. The energy-mismatch issue in the central comparison is the main obstacle; it is fixable with a quantitative correction or a properly hedged claim. The paper fits the scope of the journal/proceedings, but the load-bearing point needs strengthening before publication."},"author_rebuttal":null,"desk_editor":{"model":"deepseek-v4-flash","letter":"Quick take: this is a solid, straightforward conference paper presenting the first centrality-differential strange-hadron spectra and yield ratios in OO collisions at the LHC. The measurement itself is well done in the standard ALICE framework: invariant-mass reconstruction, Gaussian/Crystal Ball signals, polynomial backgrounds, efficiency corrections, and FT0C event-activity classes. The K0S spectra and the (Lambda+anti-Lambda)/2K0S ratio versus pT show clear centrality dependence, and the integrated yield ratios in Fig. 3 fall on the smooth multiplicity-driven trend established in pp, p-Pb, and Pb-Pb. That is genuinely new because OO fills a gap between small and large systems, and it supports the empirical statement that charged-particle multiplicity is a good scaling variable for relative strangeness yields.\n\nThe soft spot is exactly where the stress test points. The paper's more interesting claim—that OO mean pT follows the Pb-Pb trend rather than the pp/p-Pb trend at comparable multiplicity—is made by direct comparison of OO at sqrt(s_NN)=5.36 TeV with pp, p-Pb, and Pb-Pb at 5.02 TeV. No correction or even a caveat is given for the 6.8% energy difference. Since mean pT does rise with collision energy at fixed multiplicity, the OO points are shifted upward by some unknown amount. Whether that shift is large enough to change the qualitative conclusion is not assessable from the paper; a quantitative comparison (slope or chi-square over the overlapping multiplicity range) is missing. So the \"follows Pb-Pb\" claim is plausible but not yet supported at the level the text implies. This is a moderate flaw, not a fatal one: the yield-ratio result does not depend on that comparison, and the energy shift is likely small compared with the pp-to-Pb-Pb spread, but the authors should say so and ideally show the energy dependence.\n\nOther notes: the data are preliminary and only shown in figures; no data tables or code, which is typical for a proceedings but limits independent verification. The model comparisons (Pythia8 Angantyr, Ropes) are external and not fitted, so there is no circularity issue. The citation pattern looks appropriate, mostly relevant ALICE papers.\n\nWho is this for? Practitioners in heavy-ion and small-system QCD who want the OO data point and a first look at strangeness in an intermediate-size system. It deserves a serious referee: the new measurement is worth refereeing, and the energy-matching issue needs to be addressed in revision. For a proceedings, the current form is acceptable with a caveat; for a journal, I would require a discussion of the energy dependence and preferably tables of the measured points.","headline":"First OO strange-hadron results are a genuinely new data point, but the main dynamics claim leans on an unquantified 5.36-vs-5.02 TeV comparison.","tokens_in":4998,"tokens_out":2555,"would_cite":true,"duration_ms":23402,"reading_group":"maybe","serious_thinker":"yes","would_accept_peer_review":true},"rs_alignment":null,"lean_confirmation":null,"pith_extraction":{"msc":[],"pacs":["25.75.-q"],"model":"deepseek-v4-flash","headline":"This paper reports the first centrality-differential measurement of strange and multi-strange hadron production in oxygen–oxygen collisions at the LHC, and claims that at comparable final-state multiplicity the spectral evolution follows…","keywords":["strangeness enhancement","oxygen-oxygen collisions","light-ion collisions","strange hadron production","mean transverse momentum","baryon-to-meson ratio","multiplicity scaling","collective radial expansion"],"falsifier":"A measurement of the same $\\langle p_{\\mathrm{T}}\\rangle$-versus-multiplicity and yield-ratio trends in OO collisions at $\\sqrt{s_{\\mathrm{NN}}}=5.02$ TeV, or in pp and p–Pb collisions at 5.36 TeV, would settle the question: if the OO points then join the small-system trend instead of the Pb–Pb trend, the apparent system-size effect is an energy artifact.","tokens_in":3983,"feed_emoji":"⚛️","tokens_out":11298,"duration_ms":97957,"temperature":0.7,"pith_summary":"Oxygen–oxygen collisions at the LHC are the first light-ion system large enough to sit between proton–proton and lead–lead collisions while reaching the same charged-particle multiplicities as high-activity small systems. This paper uses those collisions to separate the roles of final-state multiplicity and system size in strangeness production: it measures how often strange and multi-strange hadrons are produced and how hard their transverse-momentum spectra are, as a function of event activity. The central finding is that the relative yields of strange to non-strange hadrons scale smoothly with multiplicity across all collision systems, but the spectral hardening with multiplicity tracks lead–lead rather than proton–proton. The paper concludes that similar final-state multiplicities do not necessarily imply similar particle-production dynamics: multiplicity largely governs how much strangeness is produced, while system size and initial geometry leave a visible imprint on the dynamics of that production. If this distinction holds, models of particle production need to reproduce the yield trend and the spectral trend separately.","feed_headline":"Oxygen-oxygen collisions mimic lead in strange-hadron dynamics","feed_subtitle":"First strange-hadron data at matching multiplicities show system size, not just multiplicity, sets production dynamics.","key_machinery":"The argument is carried by comparing two types of observables across collision systems. The first type is the set of $p_\\mathrm{T}$-integrated yield ratios $(\\Lambda+\\bar{\\Lambda})/(2K^0_S)$, $(\\Xi^-+\\bar{\\Xi}^+)/(2K^0_S)$, and $(\\Omega^-+\\bar{\\Omega}^+)/(2K^0_S)$ as functions of the charged-particle multiplicity density $\\langle dN_{\\mathrm{ch}}/d\\eta\\rangle_{|\\eta|<0.5}$. The second is the mean transverse momentum $\\langle p_\\mathrm{T}\\rangle$ of each strange hadron species in the same multiplicity variable. Both are built from invariant-mass reconstructions of weak-decay topologies, with centrality classes defined by the forward FT0C detector amplitude; the contrasting behaviour of the two observable types is what separates multiplicity-scaling yields from system-dependent dynamics.","core_discovery":"At $\\sqrt{s_{\\mathrm{NN}}} = 5.36$ TeV, the first centrality-differential oxygen–oxygen measurements of $K^0_S$, $\\Lambda+\\bar{\\Lambda}$, $\\Xi^-+\\bar{\\Xi}^+$, and $\\Omega^-+\\bar{\\Omega}^+$ show that the integrated yield ratios of strange and multi-strange baryons to $2K^0_S$ continue the smooth multiplicity-driven curve seen in pp, p–Pb, and Pb–Pb, while the spectral observables do not. The mean transverse momentum $\\langle p_\\mathrm{T}\\rangle$ and the centrality-dependent hardening of the transverse-momentum spectra rise with multiplicity along the Pb–Pb trend even though the OO multiplicities match the small-system range. The paper's stated conclusion is that similar final-state multiplicities do not necessarily imply similar particle-production dynamics: multiplicity largely governs the relative yields, while system size and initial geometry leave a visible imprint on the dynamics of strange-hadron production.","pith_inferences":["An implicit consequence of the paper's distinction between yield ratios and spectral observables is that the blanket term 'strangeness enhancement' may need to be split into a multiplicity-driven component and a system-size-driven component; the paper does not draw this conclusion explicitly.","A testable extension would be to measure identified-particle elliptic flow in the same OO centrality classes: the Pb–Pb-like spectral evolution predicts a positive, mass-ordered flow signal at intermediate $p_\\mathrm{T}$ if radial or anisotropic collectivity is the underlying cause.","If the results are confirmed at matched collision energy, they suggest that future small-system comparisons should control beam energy tightly, since energy-dependent spectral hardening can otherwise masquerade as a genuine system-size effect."],"forward_implications":["If the claim is correct, the smooth multiplicity scaling of integrated strange-hadron yield ratios holds across pp, p–Pb, OO, and Pb–Pb, making charged-particle multiplicity an effective scaling variable for relative strange-hadron production.","The Pb–Pb-like spectral hardening seen in OO at small-system multiplicities implies that system size and initial geometry must be included in descriptions of particle production, not only final-state multiplicity.","Centrality-dependent hardening of the $p_\\mathrm{T}$ spectra and the strengthening baryon-to-meson ratio with centrality in OO are consistent with collective radial expansion operating in a system smaller than Pb–Pb.","The current Monte Carlo generators do not reproduce both the magnitude and the multiplicity dependence of the measured $\\langle p_\\mathrm{T}\\rangle$ values, so the OO data provide new constraints on models of spectral hardening across collision systems."],"supporting_citations":[{"why":"Supplies the pp reference points at 5.02 TeV used for the mean-$p_{\\mathrm{T}}$ and yield-ratio comparisons in Figs. 2 and 3.","marker":"[3]"},{"why":"Supplies the p–Pb reference points at 5.02 TeV used for the same comparisons.","marker":"[6]"},{"why":"Supplies additional p–Pb reference points at 5.02 TeV covering the multiplicity range of the OO data.","marker":"[7]"},{"why":"Supplies the Pb–Pb reference points at 5.02 TeV that the OO spectral trends are claimed to follow.","marker":"[9]"},{"why":"Supplies the Monte Carlo generator predictions for OO and Pb–Pb shown alongside the mean-$p_{\\mathrm{T}}$ data.","marker":"[13]"},{"why":"Supplies the Monte Carlo generator predictions for pp shown in the same comparison.","marker":"[14]"}],"fun_headline_variants":["OO collisions reveal system size shapes strangeness dynamics","System size, not just multiplicity, sets strange-hadron dynamics","Oxygen-oxygen data: multiplicity scales yields, size dictates dynamics","First OO strange-hadron results: system size beyond multiplicity"],"cache_read_input_tokens":3200,"weakest_assumption_plain":"The comparison treats the 340 MeV per-nucleon-pair beam-energy difference between the new OO data (5.36 TeV) and the reference systems (5.02 TeV) as negligible; if the higher energy alone hardens the spectra, the claimed Pb–Pb-like signature could be an energy effect rather than a system-size effect.","fun_headline_variants_meta":{"raw":{"variants":["OO collisions reveal system size shapes strangeness dynamics","System size, not just multiplicity, sets strange-hadron dynamics","Oxygen-oxygen data: multiplicity scales yields, size dictates dynamics","First OO strange-hadron results: system size beyond multiplicity"]},"model":"deepseek-v4-flash","effort":"low","cost_usd":0.00068,"raw_usage":{"total_tokens":3073,"prompt_tokens":913,"completion_tokens":2160,"prompt_tokens_details":{"cached_tokens":384},"prompt_cache_hit_tokens":384,"prompt_cache_miss_tokens":529,"completion_tokens_details":{"reasoning_tokens":2089}},"tokens_in":529,"tokens_out":2160,"duration_ms":29973,"temperature":1.0,"reasoning_tokens":2089,"cache_read_input_tokens":384,"cache_creation_input_tokens":0},"cache_creation_input_tokens":0},"created_at":"2026-08-15T14:56:16.168942+00:00","model_set":{"reader":"deepseek-v4-flash"},"falsifier":"A measurement of the same $\\langle p_{\\mathrm{T}}\\rangle$-versus-multiplicity and yield-ratio trends in OO collisions at $\\sqrt{s_{\\mathrm{NN}}}=5.02$ TeV, or in pp and p–Pb collisions at 5.36 TeV, would settle the question: if the OO points then join the small-system trend instead of the Pb–Pb trend, the apparent system-size effect is an energy artifact.","supporting_citations":[],"review_version":2}