{"id":"d79a2219-701b-437e-a87a-982a89ba09b3","arxiv_id":"1908.09672","paper_version":1,"verdict":"UNVERDICTED","confidence":"HIGH","novelty_score":0.0,"correctness_risk":"low","formal_verification":"none","parameter_count":2,"one_line_summary":"A review article summarizing LHC dark matter searches, mostly supersymmetric scenarios, with no observed excess and model-dependent limits from ATLAS, CMS, and GAMBIT.","lead":"This is an invited review of ATLAS and CMS collider searches for supersymmetric dark matter and mediator-based dark matter models, summarizing the Run-2 limits as of August 2019. A generalist should read it for a compact, current map of where the LHC has looked for dark matter and why the limits are model-dependent.","discovery_kind":"review","skeptic_critique":{"model":"deepseek-v4-flash","headline":"No significant objection identified; the central caveat—simplified-model limits do not robustly map onto the full MSSM—is explicitly stated in §4.3.4 and §9, so the review does not overclaim its status picture.","rationale":"The reader's weakest assumption, that simplified-model searches are representative enough to map limits onto actual supersymmetric DM candidates, is precisely the most fragile premise of the paper's central status claim. However, the paper does not hide this fragility: it cites the GAMBIT conclusion in §4.3.4 and repeats the caveat in the conclusion, including the unreached relic-density-preferred mass ranges and the unaddressed long-lived-particle scenarios. A review article that explicitly frames its limits as simplified-model results and warns about model dependence is not making an internally inconsistent or unsupported central claim. The alternative load-bearing requirement, that the cited ATLAS/CMS results are faithfully reported, is a matter of citation accuracy and cannot be falsified from within the manuscript; nothing in the text contradicts the quoted limits. The 3-sigma excesses reported in the RJigsaw discussion are properly contextualized as not confirmed and not significant. Therefore no correction to the reader's UNVERDICTED verdict is needed; the paper stands as a well-caveated review whose scientific weight depends on primary sources rather than on a new claim.","tokens_in":26858,"tokens_out":4095,"duration_ms":42475,"concrete_test":"Re-run the GAMBIT likelihood combination of §4.3.4 including the post-2016 full Run-2 ATLAS and CMS results cited in this review, such as Refs. 64, 77, 103, 106, and 108. If the updated combination still excludes no chargino/neutralino mass range in the full MSSM, then the 'comprehensive coverage' claim must be read strictly as coverage of simplified-model searches rather than of the full SUSY parameter space; if it does exclude a range, the central status claim is strengthened.","verdict_should_be":"UNCHANGED","load_bearing_attack":"The review's central statement is a status summary: ATLAS and CMS have a comprehensive search program, the highlighted searches set limits in simplified models, and none observed a significant excess. For this claim to hold, the cited experimental results must be reported faithfully and the simplified-model interpretations must be representative of actual SUSY DM candidates. The second premise is the weaker one. The paper itself documents that weakness in §4.3.4: a GAMBIT likelihood combination concludes that no chargino/neutralino mass range can be robustly excluded in the full MSSM because the ATLAS/CMS searches considered are sensitive only to simplified decay patterns. Section 9 further concedes that pure-higgsino and pure-wino LSPs are not yet probed at the relic-density-preferred masses (about 1.1 TeV and 3 TeV) and that long-lived-particle scenarios are not covered by most conventional searches. Thus the 'collider dark matter picture' is a picture of simplified-model coverage, not of robust MSSM constraints. Because these limitations are explicitly acknowledged in the text rather than hidden, they do not make the review internally inconsistent or misleading. The 3-sigma local excesses in §4.3.2 are described as not confirmed by later full-dataset results and are not called significant, so the 'none of these searches observed a significant excess' statement is consistent with the material presented.","agreement_with_reader":"agree"},"referee_report":{"model":"deepseek-v4-flash","summary":"This manuscript is a review of the LHC collider search programme for dark matter, with emphasis on supersymmetric candidates. It describes the simplified models used by ATLAS and CMS (SUSY simplified models, mediator simplified models, Higgs/Z portals, effective field theory), explains the common event-topology ingredients such as missing transverse momentum, m_eff, m_T, and m_T2, and then highlights a selection of results: strong-production searches for gluinos and squarks, stop and sbottom searches, electroweakino searches (higgsino, wino/bino, slepton), generic jet/V/gamma/H plus missing-ET searches, invisible Higgs decays, and comparisons with direct detection. The central status claim is that the ATLAS/CMS search programme is comprehensive and that none of the reported searches observed a significant excess.","tokens_in":27100,"tokens_out":9008,"duration_ms":76773,"significance":"If the status summary is accurate, the paper is a useful and reliable snapshot of the collider dark matter landscape as of mid-2019. Its strengths are traceability to public ATLAS/CMS papers and notes, explicit discussion of model dependence, and, notably, the GAMBIT caveat in Sec. 4.3.4, which warns that simplified-model limits do not robustly exclude any chargino/neutralino mass range in the full MSSM. The paper also correctly notes in Sec. 9 that pure-higgsino and pure-wino LSPs at the relic-density-preferred masses and long-lived-particle scenarios are not yet covered. Because these limitations are stated rather than hidden, the review does not overclaim, and its value as a citable overview is real.","major_comments":[],"minor_comments":[{"comment":"The abstract contains a typo: 'which existence' should read 'whose existence'. In addition, 'WIMPS' in Section 1 should be 'WIMPs'.","section":"Abstract"},{"comment":"The relic-density constraint list is garbled: 'or 2 m(LSP)∼ m(h)' should presumably read 'or m(LSP) ∼ m(h)' without the stray '2'. Please also re-check the numeration of the list.","section":"§2.1"},{"comment":"The caption and figure panel for Fig. 3 include placeholder sub-captions such as 'Figure 1: Diagram 1' and 'Figure 2: Diagram 2' that appear to be remnants from another document; the final figure should be cleaned.","section":"§3 / Fig. 3"},{"comment":"When describing the RJigsaw analysis, the text says 'the excess could not be confirmed'; since multiple 3σ deviations were mentioned, it should read 'these excesses' or 'none of the excesses' for grammatical accuracy.","section":"§4.3.2"},{"comment":"The invisible-Higgs limit should be typeset as B(H → invisible) < 0.19 rather than the inline 'BH→invisible'.","section":"§7"},{"comment":"To avoid ambiguity in the concluding claim 'None of these searches observed a significant excess', please add an explicit sentence noting that the local 3σ excesses discussed in §4.3.2 are below the usual 5σ significance criterion and were not confirmed in the full dataset.","section":"§9"}],"recommendation":"minor_revision","confidential_remarks":"This is a review article rather than an original research contribution. Its acceptance should be evaluated against the journal's policy for reviews. I have no concerns about the fidelity of the reporting to the cited ATLAS/CMS sources, and the paper is candid about the limitations of simplified-model interpretations. The main editorial caution is that the field has moved quickly since the 2019 literature cutoff; if the journal expects an updated bibliography, that should be requested separately."},"author_rebuttal":null,"desk_editor":{"model":"deepseek-v4-flash","letter":"Colleague,\n\nThis is a review, not a research paper. If you go in expecting new limits or a new framework, you'll leave empty-handed. What it actually is: a careful status map of ATLAS/CMS searches for supersymmetric dark matter and mediator simplified models, with the emphasis on SUSY candidates. The author knows the material, and it shows.\n\nThe strongest part is the honesty about model dependence. Section 4.3.4 reports the GAMBIT conclusion that no chargino/neutralino mass range can be robustly excluded in the full MSSM because the searches only probe simplified decay patterns. Section 9 explicitly concedes that pure higgsino and wino LSPs remain out of reach at the relic-density-preferred masses, and that long-lived particle scenarios are not covered by most conventional searches. The review also flags the 3-sigma excesses in the RJigsaw analysis and notes they didn't survive the full dataset. That's the right way to handle a status report.\n\nThe soft spots are mostly inherent to the genre. It ages quickly; most limits quoted are from 36-80 fb^-1, with only a few from the first full Run-2 dataset. The 'comprehensive' language in the intro and conclusion is a little generous given the gaps it itself documents. And it tilts toward ATLAS, though CMS is covered. These are minor issues, not defects of the review's core claim. The central message—no significant excess seen, and simplified-model limits should not be equated with MSSM bounds—holds up.\n\nWho's it for? A graduate student or a colleague from a neighboring field who wants a readable entry point into the LHC DM search program. It has no lasting scientific value beyond being a snapshot, but snapshots have their use. I'd send this to peer review if I were the editor: it's accurate, traceable, and appropriately cautious. I wouldn't cite it in my own work, but that's because it's a review, not because it's wrong.","headline":"An honest, well-structured status review of LHC dark matter searches as of August 2019; no new science, but accurate, traceable, and worth a serious referee.","tokens_in":27605,"tokens_out":2001,"would_cite":false,"duration_ms":22283,"reading_group":"maybe","serious_thinker":"yes","would_accept_peer_review":true},"rs_alignment":null,"lean_confirmation":null,"pith_extraction":{"msc":[],"pacs":[],"model":"deepseek-v4-flash","headline":"This review claims that the LHC's Run-2 search program for dark matter, with special focus on supersymmetric candidates, is comprehensive and that none of its searches observed a significant excess.","keywords":["supersymmetry","dark matter","LHC","missing transverse momentum","electroweakinos","simplified models","direct detection complementarity","collider searches"],"falsifier":"A single 5$\\sigma$ excess in any of the signal regions the review compiles, say the 0-lepton multi-jet search, the three-body stop search, or the soft-dilepton compressed-higgsino search, would falsify the claim that none of the searches observed a significant excess, since the specific signal regions, luminosities, and event counts are listed in the cited experimental papers.","tokens_in":26616,"feed_emoji":"🌌","tokens_out":7534,"duration_ms":74431,"temperature":0.7,"pith_summary":"This review tries to establish that the dark matter search program at the LHC, with special focus on supersymmetric candidates, now gives a coherent and essentially complete collider picture: searches cover strong production of gluinos and squarks, third-generation squarks, charginos and neutralinos, sleptons, and mediator-based simplified models. The central claim is that none of these searches found a significant excess, so the plotted 95% confidence-level exclusion limits are the current experimental boundary on supersymmetric and mediator dark matter. A sympathetic reader should care because this is the experimental status that any model of weakly interacting dark matter must face, and because the review identifies where the remaining open space is, especially compressed higgsino and wino scenarios. It also argues that the Run-2 dataset has, for the first time, let LHC searches reach into electroweak production channels such as low-energy leptons and disappearing tracks.","feed_headline":"No excess in any LHC dark matter search","feed_subtitle":"Supersymmetric and mediator limits now cover gluinos, stops, charginos; relic-density higgsino and wino ranges remain untested.","key_machinery":"The machinery that carries the argument is the LHC search signature of missing transverse momentum ($E_T^{\\text{miss}}$) produced by a stable, weakly interacting lightest supersymmetric particle, paired with decay-specific observables such as the effective mass $m_{\\text{eff}}$, transverse mass $m_T$, the $m_{T2}$ variable, RJigsaw scale variables, and object-based $E_T^{\\text{miss}}$ significance. Searches are designed and interpreted through simplified models, in which one sparticle pair is produced and decays to the LSP along a specific chain with all other sparticles decoupled; the analysis then defines exclusive signal regions and combines them in a profile likelihood fit to set 95% confidence-level exclusion limits. This combination of a common invisible-particle signature, model grids, and simultaneous fits is what lets the review translate many individual searches into one dark matter picture.","core_discovery":"On the paper's own terms, the discovery is the status summary: after Run-2 data taking at 13 TeV with integrated luminosities reaching about 140 $fb^{{-1}}$, the LHC experiments have conducted a search program for dark matter that is broad enough to be called comprehensive, and none of the searches highlighted in this review observed a statistically significant excess. The consequence is that limits such as gluino masses up to about 2 TeV for a light LSP, squark masses up to about 1.6 TeV, stop exclusion up to about 720 GeV in the three-body decay region, first LHC constraints on staus between 120 and 390 GeV, and chargino limits that go beyond previous collider bounds in compressed higgsino scenarios now stand as the experimental picture. The review stresses that these limits are model-dependent, valid for the specific simplified decay patterns assumed, and that a global MSSM reinterpretation shows no chargino/neutralino mass range is robustly excluded in the full theory.","pith_inferences":["If the null picture holds through the full Run-2 dataset, the first LHC dark matter signal is more likely to appear in the currently systematics-limited compressed channels, such as soft two-lepton and disappearing-track signatures, rather than in the well-explored gluino and squark channels.","The review's own caveat about simplified models implies that the true exclusion power on the full MSSM is weaker than the individual limit plots suggest; a global fit over all Run-2 searches would quantify how model-dependent the 'comprehensive' coverage really is.","The mediator-model comparisons with direct detection assume benchmark couplings; changing the assumed quark and dark matter couplings would shift the relative sensitivity and could change which experiment leads in a given mass range.","A testable extension would be to reinterpret the full set of Run-2 searches, including invisible Higgs and Z decays, in a common phenomenological MSSM scan, which would either confirm or soften the conclusion that existing searches cover supersymmetric dark matter."],"forward_implications":["If no significant excess is real, the remaining supersymmetric dark matter parameter space is pushed toward models with compressed spectra, low-momentum decay products, or long-lived particles.","The relic-density-preferred mass ranges for pure higgsino (about 1.1 TeV) and pure wino (about 3 TeV) LSPs are not yet reached by Run-2 searches, so a future higher-energy or higher-luminosity collider would be needed to cover them.","Many of the compiled searches used only partial Run-2 data, so applying the full dataset will sharpen the electroweakino and slepton limits before any new collider is built.","Collider searches and direct detection are complementary: the LHC is more sensitive than direct detection experiments for low dark matter masses, while direct detection covers higher masses in the same simplified models."],"supporting_citations":[{"why":"Global reinterpretation showing no chargino/neutralino mass range can be robustly excluded in the full MSSM, the key caveat on simplified-model limits.","marker":"[39]"},{"why":"CMS 0-lepton multi-jet search with 137 fb^{-1}, the workhorse analysis setting gluino limits near 2 TeV and squark limits near 1.6 TeV.","marker":"[64]"},{"why":"ATLAS summary of Run-2 limits used to compile stop, chargino, neutralino and higgsino exclusions.","marker":"[87]"},{"why":"ATLAS combination of dark matter mediator searches that provides the vector/axial-vector simplified-model limits compared with direct detection.","marker":"[8]"},{"why":"ATLAS 2/3-lepton search with $m_{T2}$ that sets the canonical limits on wino/bino chargino-neutralino production.","marker":"[103]"},{"why":"Soft-lepton search reconstructing electrons and muons down to a few GeV, which pushed chargino limits beyond previous collider bounds in compressed higgsino scenarios.","marker":"[100]"},{"why":"Disappearing-track search addressing ultra-compressed higgsino LSPs using short pixel tracklets.","marker":"[99]"},{"why":"Jet/vector-boson plus missing-transverse-momentum search whose mediator limits motivate the comparison with direct detection.","marker":"[110]"}],"fun_headline_variants":["LHC dark matter search: no excess, new SUSY limits","SUSY dark matter: LHC sees nothing, but maps remain","No dark matter bump at LHC; SUSY bounds tighten","LHC Run-2 dark matter: no excess, tighter SUSY limits","No dark matter signal at LHC; full SUSY still open"],"cache_read_input_tokens":3200,"weakest_assumption_plain":"The whole picture depends on the assumption that the simplified decay patterns used in the searches stand in for the full range of possible supersymmetric dark matter models; the review admits this is imperfect because a full-model fit finds no chargino or neutralino mass range that is robustly excluded.","fun_headline_variants_meta":{"raw":{"variants":["LHC dark matter search: no excess, new SUSY limits","SUSY dark matter: LHC sees nothing, but maps remain","No dark matter bump at LHC; SUSY bounds tighten","LHC Run-2 dark matter: no excess, tighter SUSY limits","No dark matter signal at LHC; full SUSY still open"]},"model":"deepseek-v4-flash","effort":"low","cost_usd":0.000754,"raw_usage":{"total_tokens":3308,"prompt_tokens":854,"completion_tokens":2454,"prompt_tokens_details":{"cached_tokens":384},"prompt_cache_hit_tokens":384,"prompt_cache_miss_tokens":470,"completion_tokens_details":{"reasoning_tokens":2361}},"tokens_in":470,"tokens_out":2454,"duration_ms":16839,"temperature":1.0,"reasoning_tokens":2361,"cache_read_input_tokens":384,"cache_creation_input_tokens":0},"cache_creation_input_tokens":0},"created_at":"2026-08-14T11:04:39.906308+00:00","model_set":{"reader":"deepseek-v4-flash"},"falsifier":"A single 5$\\sigma$ excess in any of the signal regions the review compiles, say the 0-lepton multi-jet search, the three-body stop search, or the soft-dilepton compressed-higgsino search, would falsify the claim that none of the searches observed a significant excess, since the specific signal regions, luminosities, and event counts are listed in the cited experimental papers.","supporting_citations":[{"cited_title":"ATL-PHYS-PUB-2019-022, 2019 (unpublished)","cited_arxiv_id":null,"evidence_quote":"ATLAS summary of Run-2 limits used to compile stop, chargino, neutralino and higgsino exclusions."},{"cited_title":null,"cited_arxiv_id":null,"evidence_quote":"ATLAS 2/3-lepton search with $m_{T2}$ that sets the canonical limits on wino/bino chargino-neutralino production."},{"cited_title":null,"cited_arxiv_id":null,"evidence_quote":"Soft-lepton search reconstructing electrons and muons down to a few GeV, which pushed chargino limits beyond previous collider bounds in compressed higgsino scenarios."},{"cited_title":null,"cited_arxiv_id":null,"evidence_quote":"Disappearing-track search addressing ultra-compressed higgsino LSPs using short pixel tracklets."},{"cited_title":null,"cited_arxiv_id":null,"evidence_quote":"Jet/vector-boson plus missing-transverse-momentum search whose mediator limits motivate the comparison with direct detection."}],"review_version":1}