{"id":"da32ecdc-5810-4e51-b820-21802cdd5b87","arxiv_id":"2506.06839","paper_version":1,"verdict":"UNVERDICTED","confidence":"MODERATE","novelty_score":0.0,"correctness_risk":"unknown","formal_verification":"none","parameter_count":0,"one_line_summary":"A review of recent ATLAS and CMS SUSY searches showing tighter exclusions in compressed, long-lived, RPV, and Z-prime mediated scenarios, with no discovery.","lead":"This conference proceeding summarizes the newest ATLAS and CMS searches for supersymmetric particles at the LHC. It reviews compressed-mass, long-lived, R-parity-violating, and Z-prime mediated signatures, with updated exclusion limits.","discovery_kind":"review","skeptic_critique":{"model":"deepseek-v4-flash","headline":"Section 5's RPV SUSY exclusion >800 GeV cites an ATLAS note on vector-like leptons, not on RPV SUSY; the RPV pillar of the central claim rests on a mismatched reference.","rationale":"The reader identified the load-bearing assumption as the correct representation of internal ATLAS and CMS notes; I agree that this is the key premise. However, the reader treated this as a general unverifiability issue, whereas a close reading of the manuscript exposes a specific, checkable internal inconsistency: Section 5's RPV SUSY claim is paired with a reference whose title describes an unrelated vector-like-lepton search. This is stronger than 'cannot be independently checked' because the manuscript itself provides contradictory evidence. If the citation mismatch is real, the review's RPV phase-space claim lacks support and the summary should be corrected before it can be relied upon as an accurate status report. I therefore recommend CONDITIONAL rather than leaving the verdict at UNVERDICTED: the paper is a useful review, but it should be accepted only after the Section 5 reference/description is verified and corrected if necessary. The overstatement in Section 2 about sub-GeV coverage adds a minor secondary concern but does not drive the verdict. My recommendation is made in good faith; the issue may turn out to be a harmless typo in the bibliography, which is exactly why the concrete test is a quick record lookup rather than a reanalysis.","tokens_in":4157,"tokens_out":3338,"duration_ms":37663,"concrete_test":"Retrieve CERN CDS record 2928846 (reference [11]) and compare its title, abstract, and model interpretations with Section 5. If the record is about vector-like leptons and contains no RPV SUSY higgsino/wino interpretation, the >800 GeV exclusion claim is unsourced and the review needs a corrected reference or a corrected description. If the record does contain an RPV interpretation despite the vector-like-lepton title, then the bibliography is merely mistitled and the concern is resolved.","verdict_should_be":"CONDITIONAL","load_bearing_attack":"The review's central claim is that recently reported ATLAS and CMS searches enlarge the excluded SUSY phase space. Section 5, 'Search for R-parity violating supersymmetric signatures', reports exclusions exceeding 800 GeV for higgsino and wino masses in an RPV interpretation, citing reference [11]. However, reference [11] is titled 'Search for electroweak production of vector-like leptons in tau-lepton and b-jet final states in pp collisions at sqrt(s)=13 TeV with the ATLAS detector', which is a different BSM model and contains no stated RPV SUSY interpretation. Unless the bibliography has the wrong note number, the Section 5 numbers are not supported by the cited source. Since the paper is a proceedings summary that reproduces no numbers or derivations, this is a concrete internal inconsistency in the evidence chain, not merely an unverifiable external claim. A second, smaller sign of carelessness is in Section 2, where analysis [5] is described as dedicated to mass splittings below 1 GeV and analysis [6] as extending sensitivity down to 0.5 GeV, an overlap that is not explained; this may be a typographical issue but reinforces the need for source checking. The RPV result is a distinctive part of the paper's claimed new phase-space coverage, so the central claim is weakened if the citation cannot be confirmed.","agreement_with_reader":"partial"},"referee_report":{"model":"deepseek-v4-flash","summary":"This paper is a Moriond proceedings summary by H. Kwon, on behalf of the ATLAS and CMS collaborations, reporting recent LHC searches for supersymmetry in non-standard signature spaces. It covers four topics: compressed-mass electroweak production in CMS higgsino searches and ATLAS slepton searches (Section 2), long-lived sleptons and charginos in ATLAS (Section 3), CMS search for charginos produced via a heavy Z' boson (Section 4), and an ATLAS analysis interpreted in an R-parity-violating SUSY scenario (Section 5). The central claim is that these recent searches enlarge the excluded SUSY phase space, for example by covering the full range of Delta m(chi_1^+- - chi_1^0) for compressed higgsinos, by setting the most stringent slepton limits to date in a degenerate scenario, and by reaching RPV higgsino and wino masses above 800 GeV. The paper is a review of public collaboration results and contains no original derivations or new data.","tokens_in":4373,"tokens_out":4337,"duration_ms":44629,"significance":"If the cited public notes are correctly represented, this short paper gives a useful and timely survey of the current frontier in ATLAS and CMS SUSY searches, emphasizing technically challenging final states. The claimed advances are concrete and falsifiable: the specific exclusion limits and phase-space coverage can be checked against the cited CDS records. The paper gives appropriate credit to the collaborations and the relevant references, and it is a reasonable summary for a conference proceedings. Its main weakness is that it does not reproduce or independently verify any of the quoted numbers; its validity rests entirely on the accurate representation of the cited notes. The reference mismatch in Section 5 is a significant flaw because it directly affects one of the paper's claimed new results. If the citation is corrected, the summary would likely serve its purpose as a community snapshot.","major_comments":[{"comment":"The text states that an ATLAS analysis interpreted in the context of RPV SUSY excludes higgsino and wino masses above 800 GeV, citing reference [11]. However, reference [11] is titled \"Search for electroweak production of vector-like leptons in tau-lepton and b-jet final states in pp collisions at sqrt(s)=13 TeV with the ATLAS detector,\" which concerns a different BSM model and does not provide an RPV SUSY interpretation. As written, the claimed exclusion limits in Section 5 are not supported by the cited evidence. This is a load-bearing error because Section 5 is the only source for the RPV component of the paper's central claim that recent searches enlarge the excluded SUSY phase space. The paper must either replace reference [11] with the correct ATLAS RPV analysis (if one exists) or remove/qualify the RPV exclusion claim. The author should also audit the other references for similar mismatches.","section":"Section 5, reference [11]"}],"minor_comments":[{"comment":"The descriptions of the two CMS compressed-higgsino analyses are confusing: analysis [5] is said to be dedicated to mass splittings below 1 GeV, while analysis [6] is said to extend sensitivity to sub-GeV mass splittings down to 0.5 GeV. Since 0.5 GeV is already below 1 GeV, the complementary coverage is not evident from the text. Please clarify the actual mass-splitting ranges targeted by each analysis (e.g., one using isolated tracks and the other using soft leptons) so that the claim of probing the full Delta m range is understandable.","section":"Section 2, analyses [5] and [6]"},{"comment":"The sentence \"Some of the recent results covers the unexplored SUSY phase space from prior results, brings a new insight to the SUSY landscape\" has subject-verb agreement issues and is awkwardly phrased; please revise for clarity.","section":"Abstract"},{"comment":"Reference [1] attributes the simplified models paper to only \"Daniele Alves\" but the published paper is authored by D. Alves et al.; please update the reference to include all authors or use the standard collaboration citation.","section":"References"},{"comment":"\"Recontres de Moriond\" should be \"Rencontres de Moriond.\"","section":"Acknowledgments"},{"comment":"The caption is partially garbled (e.g., \"3b MST, 140 fb hadtau\", \"1-3b BJET\"). Please check that the caption reproduces the expected limit labels correctly, as it currently appears to combine characters in a way that obscures which signal regions are shown.","section":"Figure 2 caption (right)"}],"recommendation":"major_revision","confidential_remarks":"The reference mismatch in Section 5 is the kind of error that should be caught before publication; it may indicate that the author did not carefully verify the bibliography against the CDS records. The paper is a legitimate conference proceedings contribution, but for a journal audience the lack of any original data or analysis makes the scope quite limited. The editor may want to ensure that the corrected reference and any revised claims are checked by someone with access to the actual ATLAS/CMS public results."},"author_rebuttal":null,"desk_editor":{"model":"deepseek-v4-flash","letter":"Nothing in this paper is new: it's a conference proceedings summary of recent ATLAS and CMS SUSY searches. That's fine—it's a readable status report for people who want the current numbers without chasing ten CDS notes. It does a decent job of conveying the gist: compressed higgsinos excluded up to ~195 GeV, slepton limits around 400 GeV, a first Z'->chargino search, and an RPV interpretation with >800 GeV exclusions. The figures come from the analyses and the text tracks them.\n\nThe soft spots are real but not devastating. The biggest is Section 5. It reports RPV SUSY exclusions above 800 GeV and cites reference [11], which is the ATLAS search for vector-like leptons in tau+b-jet final states. That note has nothing to do with RPV SUSY. Either the bibliography is wrong or the text is describing a different analysis. For a paper whose whole job is accurate summary, this is a load-bearing error—it undermines the one number the reader would walk away with. It needs correcting before this can be trusted.\n\nSecond, Section 2 says analysis [5] covers mass splitting below 1 GeV and analysis [6] extends down to 0.5 GeV. That's an odd overlap, probably a typo, but it's exactly the kind of thing that should be cleaned up. There are also minor grammar issues throughout (e.g., 'results covers', 'constrains on higgsino mass'). None of that changes the physics, but it adds friction.\n\nI don't think there's a deep flaw in the claim that recent searches enlarge the excluded SUSY phase space—that's consistent with the figures and with the cited analyses. The paper just can't serve as an independent check, since every number is quoted from collaboration notes. That's inherent to the genre.\n\nWho is this for? Someone who wants a quick, current map of where ATLAS and CMS stand on non-standard SUSY searches. It's not a citation-worthy primary source; if you use these numbers, cite the underlying notes. For a proceedings, it deserves a review pass, mainly to fix the reference and clarify the compressed-mass overlap. I'd let it through with corrections.","headline":"Useful proceedings summary of recent ATLAS/CMS SUSY searches, but Section 5's RPV exclusion rests on a mismatched reference to a vector-like lepton search.","tokens_in":4931,"tokens_out":2644,"would_cite":false,"duration_ms":26702,"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":"Recent ATLAS and CMS searches shrink the remaining SUSY phase space by targeting compressed, long-lived, resonance-mediated, and R-parity-violating signatures.","keywords":["supersymmetry","LHC","ATLAS","CMS","compressed mass spectra","long-lived particles","R-parity violation","machine learning"],"falsifier":"Reproduce the central numbers from the underlying notes, for instance recompute the 195 GeV compressed-higgsino exclusion from the CMS soft-track analysis with its published event counts and background model; if the observed limit falls below 195 GeV once a background mismodeling is corrected, the paper's claim of full-range coverage loses its factual basis.","tokens_in":3935,"feed_emoji":"⚛️","tokens_out":5660,"duration_ms":59115,"temperature":0.7,"pith_summary":"This review of recent LHC work reports that ATLAS and CMS have moved supersymmetry searches beyond the standard prompt, high-momentum signatures and into phase-space corners that had been hard to reach: highly compressed mass spectra, long-lived particles, heavy-resonance-mediated production, and R-parity-violating decays. The stated payoff is concrete: the full range of $\\Delta m(\\tilde{\\chi}_1^\\pm - \\tilde{\\chi}_1^0)$ for compressed higgsinos is now covered, direct slepton searches set the most stringent limits to date in a four-fold degenerate scenario, and RPV higgsino and wino masses above 800 GeV are excluded. No discovery is claimed; the value of the paper is that it charts where the null results have recently tightened and which techniques made the new coverage possible.","feed_headline":"New SUSY searches close the compressed-higgsino gap","feed_subtitle":"Null results extend limits on sleptons, long-lived particles, and RPV scenarios.","key_machinery":"The load-bearing objects are the non-prompt or non-standard signatures that make these searches sensitive where older ones failed: compressed mass spectra with soft final-state objects; long-lived sleptons and charginos with displaced leptons; a heavy neutral gauge boson $Z'$ mediating chargino production, producing boosted objects; and RPV decays with an unstable LSP, giving multiple taus and $b$-jets without missing transverse momentum. The techniques carrying the sensitivity are machine-learning discriminators (a parametrized neural network for track tagging and boosted decision trees for signal regions), low-transverse-momentum electron reconstruction down to 1 GeV, and a dedicated trigger for large impact parameters and low-momentum leptons.","core_discovery":"On the paper's own terms, the central claim is that non-conventional search strategies — soft-object and displaced-object signatures, machine-learning-enhanced reconstruction, dedicated triggers, and RPV interpretations — have enlarged the excluded SUSY phase space beyond what prior prompt searches achieved. The paper cites the 195 GeV higgsino exclusion for sub-GeV mass splittings using isolated soft tracks, CMS coverage of the full $\\Delta m(\\tilde{\\chi}_1^\\pm - \\tilde{\\chi}_1^0)$ range down to 0.5 GeV, ATLAS slepton exclusions up to about 400 GeV in a four-fold degenerate compressed scenario, an improved displaced-lepton search using Run 3 data and a large-impact-parameter trigger, the first direct search for charginos produced via a heavy $Z'$ boson, and RPV higgsino/wino limits exceeding 800 GeV. These are the results the author wants a reader to take away: SUSY remains unobserved, but the viable space is smaller, and the new coverage comes from looking in previously neglected corners.","pith_inferences":["The same compressed-mass and machine-learning techniques could be applied to non-SUSY soft-object signatures such as dark photons, axion-like particles, or stealth particles, extending the experimental reach beyond supersymmetry.","If the mild 40 GeV excess in the ATLAS slepton search persists with additional data, the degenerate slepton interpretation would move from exclusion to investigation; the paper's own quoted numbers already flag that the observed limit is weaker than expected there.","Continuous coverage of the compressed-higgsino $\\Delta m$ plane implies that any remaining natural SUSY region must live at higher masses or with a different LSP composition, a statement the paper does not make explicitly.","The dedicated large-impact-parameter trigger used for displaced leptons could be reused for long-lived particles in other exotica channels, since the trigger is signature-based rather than SUSY-specific."],"forward_implications":["If the quoted limits hold, the previously open window of compressed higgsinos with sub-GeV and few-GeV mass splittings is closed up to 195 GeV, forcing natural-SUSY models with higgsino LSPs into heavier or more split configurations.","The ATLAS four-fold degenerate slepton result excludes masses up to about 400 GeV while showing a mild excess near 40 GeV, so the same phase space becomes the place to look with more luminosity.","The new displaced-lepton trigger and machine-learning-based selection extend long-lived slepton and chargino exclusions beyond the prior Run 2 result, covering longer lifetimes and heavier masses.","The first $Z'$-mediated chargino search turns a SUSY decay chain into a way to constrain both chargino and $Z'$ masses, complementing direct resonance searches.","RPV interpretations with third-generation final states push higgsino and wino exclusions past 800 GeV in models where the LSP decays without missing transverse momentum."],"supporting_citations":[{"why":"CMS compressed electroweakinos with low-momentum isolated tracks: supplies the 195 GeV higgsino exclusion for sub-GeV mass splittings.","marker":"[5]"},{"why":"CMS soft-lepton compressed mass spectra search: extends sensitivity down to 0.5 GeV splittings and completes coverage of the full $\\Delta m$ range.","marker":"[6]"},{"why":"ATLAS direct slepton production in the compressed corridor: sets the most stringent four-fold degenerate slepton limits, excluding masses up to about 400 GeV.","marker":"[7]"},{"why":"ATLAS cascade decays of charged sleptons and sneutrinos: provides unique sensitivity to $\\Delta m(\\tilde{\\chi}_3^0 - \\tilde{\\chi}_1^0) > 100$ GeV.","marker":"[8]"},{"why":"ATLAS displaced leptons search: improves long-lived slepton and chargino limits using Run 3 data and a dedicated large-impact-parameter trigger.","marker":"[9]"},{"why":"CMS search for $Z'$ bosons decaying into charginos: the first direct search for chargino production via a heavy resonance, constraining both chargino and $Z'$ masses.","marker":"[10]"},{"why":"ATLAS RPV search in $\\tau$-lepton and $b$-jet final states: yields RPV higgsino and wino exclusions above 800 GeV.","marker":"[11]"}],"fun_headline_variants":["Soft-track and displaced searches shrink SUSY gaps","ATLAS and CMS widen SUSY exclusions with ML and triggers","Compressed and long-lived SUSY scenarios now more constrained","RPV higgsino and slepton limits pushed further"],"cache_read_input_tokens":3200,"weakest_assumption_plain":"Every excluded mass and limit quoted in this review is inherited from the experimental notes it summarizes; if those notes' background estimates, systematic uncertainties, or statistical procedures are wrong, the claimed expansions of the SUSY exclusion region do not hold.","fun_headline_variants_meta":{"raw":{"variants":["Soft-track and displaced searches shrink SUSY gaps","ATLAS and CMS widen SUSY exclusions with ML and triggers","Compressed and long-lived SUSY scenarios now more constrained","RPV higgsino and slepton limits pushed further"]},"model":"deepseek-v4-flash","effort":"low","cost_usd":0.000536,"raw_usage":{"total_tokens":2523,"prompt_tokens":841,"completion_tokens":1682,"prompt_tokens_details":{"cached_tokens":384},"prompt_cache_hit_tokens":384,"prompt_cache_miss_tokens":457,"completion_tokens_details":{"reasoning_tokens":1615}},"tokens_in":457,"tokens_out":1682,"duration_ms":14691,"temperature":1.0,"reasoning_tokens":1615,"cache_read_input_tokens":384,"cache_creation_input_tokens":0},"cache_creation_input_tokens":0},"created_at":"2026-08-07T05:48:28.457780+00:00","model_set":{"reader":"deepseek-v4-flash"},"falsifier":"Reproduce the central numbers from the underlying notes, for instance recompute the 195 GeV compressed-higgsino exclusion from the CMS soft-track analysis with its published event counts and background model; if the observed limit falls below 195 GeV once a background mismodeling is corrected, the paper's claim of full-range coverage loses its factual basis.","supporting_citations":[{"cited_title":"Search for compressed electroweakinos with low-momentum isolated tracks","cited_arxiv_id":null,"evidence_quote":"CMS compressed electroweakinos with low-momentum isolated tracks: supplies the 195 GeV higgsino exclusion for sub-GeV mass splittings."},{"cited_title":"Search for new physics with compressed mass spectra in final states with soft leptons and missing transverse energy in proton-proton collisions at s =13 TeV","cited_arxiv_id":null,"evidence_quote":"CMS soft-lepton compressed mass spectra search: extends sensitivity down to 0.5 GeV splittings and completes coverage of the full $\\Delta m$ range."},{"cited_title":"Searches for direct slepton production in the compressed-mass corridor in s =13 TeV pp collisions with the ATLAS detector","cited_arxiv_id":null,"evidence_quote":"ATLAS direct slepton production in the compressed corridor: sets the most stringent four-fold degenerate slepton limits, excluding masses up to about 400 GeV."},{"cited_title":null,"cited_arxiv_id":null,"evidence_quote":"ATLAS cascade decays of charged sleptons and sneutrinos: provides unique sensitivity to $\\Delta m(\\tilde{\\chi}_3^0 - \\tilde{\\chi}_1^0) > 100$ GeV."},{"cited_title":"Search for displaced leptons in s =13 TeV and 13.6 TeV pp collisions with the ATLAS detector","cited_arxiv_id":null,"evidence_quote":"ATLAS displaced leptons search: improves long-lived slepton and chargino limits using Run 3 data and a dedicated large-impact-parameter trigger."},{"cited_title":"Search for Z' bosons decaying into charginos in final states with two oppositely charged leptons and missing transverse momentum","cited_arxiv_id":null,"evidence_quote":"CMS search for $Z'$ bosons decaying into charginos: the first direct search for chargino production via a heavy resonance, constraining both chargino and $Z'$ masses."},{"cited_title":"Search for electroweak production of vector-like leptons in -lepton and b -jet final states in pp collisions at s = 13 TeV with the ATLAS detector","cited_arxiv_id":null,"evidence_quote":"ATLAS RPV search in $\\tau$-lepton and $b$-jet final states: yields RPV higgsino and wino exclusions above 800 GeV."}],"review_version":1}