{"id":"18f4f8a9-6020-4c1d-ac54-55ad3a2ce873","arxiv_id":"2506.15306","paper_version":2,"verdict":"UNVERDICTED","confidence":"MODERATE","novelty_score":1.0,"correctness_risk":"medium","formal_verification":"none","parameter_count":3,"one_line_summary":"A workshop-based review maps beyond-Standard-Model discovery opportunities at accelerator, reactor, atmospheric, and cosmic neutrino facilities, with emphasis on East Asian programs.","lead":"This white paper surveys the many ways current and future neutrino experiments could detect new particles beyond the Standard Model, such as dark matter, axion-like particles, and sterile neutrinos. It is a workshop-based roadmap of experimental opportunities, with special attention to accelerator-based and East Asian neutrino programs.","discovery_kind":"review","skeptic_critique":{"model":"deepseek-v4-flash","headline":"The broad claim is partly supported by current data, but the quantitative case for 'substantial potential' rests on unvalidated projections; the most load-bearing one is DAMSA's 10-order-of-magnitude beam-related-neutron background suppression, which Stage 3 has not yet tested.","rationale":"The reader's weakest assumption identifies the same load-bearing concern: many next-generation sensitivity projections assume unproven detector performance and background rejection. The DAMSA case is the sharpest because the entire physics reach depends on a single simulated background-suppression factor, and the paper itself lists the needed validation as incomplete. The IsoDAR@Yemilab projections are a second concrete anchor with assumed fiducial mass, IBD efficiency, and energy resolution in a detector still under development. This concern does not change the verdict: the paper is a workshop white paper with no original measurement or derivation, and UNVERDICTED already captures its status as a roadmap rather than a source of new evidence. Credit is due for the sections on currently operating experiments, which give the broad qualitative claim some empirical footing independent of the projections. The proposed Stage 3 beam test is a single, well-defined check that would either validate or falsify the most load-bearing quantitative assumption in the accelerator-based part of the roadmap.","tokens_in":50541,"tokens_out":4181,"duration_ms":48781,"concrete_test":"Implement DAMSA Stage 3 before quoting the sensitivity: expose a 1 m tungsten target to a 600 MeV proton beam with the planned tabletop detector, measure the BRN-induced neutron and photon flux and the accidental diphoton rate after the full timing-vertex-mass cut chain, and compare with the GEANT4 prediction underlying Ref. [191]. If the measured background exceeds the simulated rate by more than a factor of a few, recompute the Fig. 3 90% C.L. sensitivity curves; if the reach shifts downward by more than an order of magnitude in g_a_gamma_gamma, the claimed prompt-decay-region coverage is not established.","verdict_should_be":"UNCHANGED","load_bearing_attack":"The central claim is a broad qualitative one, and it already has independent support from current experimental results (e.g., NEON's ALP and light dark matter limits, Super-Kamiokande and IceCube dark-matter searches), so it does not hinge on any single future sensitivity curve. The load-bearing weakness is that the quantitative part of the roadmap leans on projections whose key operating assumptions are not yet demonstrated, several of them from the authors' own studies. The clearest example is DAMSA (Sec. IV.A.1): the projected ALP reach assumes that sub-ns timing, better than 1 cm vertex resolution, and roughly MeV-level invariant-mass resolution suppress beam-related-neutron (BRN) accidental diphoton backgrounds by about ten orders of magnitude. This factor is derived from GEANT4, and the manuscript's own staged plan lists proton-beam background validation as Stage 3, which has not yet been performed; only a 2 GeV electron/pion mixed-beam test is reported. If the real BRN flux, energy spectrum, or accidental-overlap rate differs from the simulation, the 90% C.L. contours in Figs. 3 and 4 and the claimed coverage of the 'prompt-decay region' are not reliable. Similarly, the IsoDAR@Yemilab sensitivity in Sec. IV.A.7 and Table II assumes a 2.26 kton fiducial volume, 92% IBD efficiency, and 6.4%/sqrt(E) MeV energy resolution in a slow-liquid-scintillator detector that has yet to demonstrate these properties. These are not internal contradictions; they mean many quoted projections should be labeled as design goals, not validated discovery potentials.","agreement_with_reader":"agree"},"referee_report":{"model":"deepseek-v4-flash","summary":"This paper is a review/white paper based on the 4th Workshop on New Physics Opportunities in Neutrino Facilities (NPN 2024). It organizes BSM searches at neutrino facilities into laboratory-produced and cosmogenic signals, summarizes recent experimental results from Super-Kamiokande, T2K, IceCube, JSNS2, NEOS, NEON, and KamLAND-Zen, and surveys projected sensitivities for a broad set of next-generation accelerator, reactor, and underground experiments, with particular emphasis on East Asian programs. The central claim is that neutrino facilities offer substantial potential to search for new physics beyond neutrino oscillations because of their precision, diverse configurations, and intense sources. The paper contains no new derivations; it compiles and interprets published studies and workshop presentations.","tokens_in":50875,"tokens_out":5340,"duration_ms":56591,"significance":"If taken as a roadmap, the paper is a useful and generally accurate survey of a rapidly growing field. Its strengths include up-to-date coverage of recent results such as the NEON light-dark-matter and ALP limits, explicit enumeration of detector capabilities needed for BSM searches, and concrete discussion of simulation tools (GENIE-BDM, BeamHNL) and staged validation plans. The qualitative central claim is already supported by current data, e.g., NEON's ALP and light-dark-matter limits and Super-Kamiokande and IceCube dark-matter searches, so it does not hinge on any single future projection. However, the quantitative parts of the roadmap rely heavily on projected sensitivities whose key assumptions are not yet demonstrated, several of them taken from studies by the workshop organizers themselves; the manuscript does not always clearly distinguish published results from preliminary projections. These weaknesses reduce the reliability of the quantitative claims but do not invalidate the broader thesis.","major_comments":[{"comment":"Section IV.A.7 contains large blocks of text and figures reproduced verbatim from Ref. [250] without clear quotation or attribution, including the repeated 'IBD analysis assumptions' table and figures using Ref. [250]'s internal numbering (its Fig. 4 and Fig. 5). The same blocks appear multiple times consecutively, making the section difficult to read. This must be rewritten with clear attribution, consistent figure and table numbering, and removal of duplicates before the paper can be evaluated for publication.","section":"IV.A.7"},{"comment":"The projected DAMSA ALP reach in Figs. 3 and 4 assumes suppression of beam-related-neutron (BRN) accidental diphoton backgrounds by about ten orders of magnitude, based on GEANT4 simulations. The manuscript's own staged plan lists proton-beam background validation as Stage 3, which has not yet been performed; only a 2 GeV mixed electron/pion beam test is reported. The text should state explicitly that the prompt-decay-region coverage is a projection contingent on Stage 3 validation, rather than presenting these contours as established experimental capabilities.","section":"IV.A.1"},{"comment":"The IsoDAR@Yemilab sensitivity shown in Fig. 10 depends on the assumptions in Table II: a 2.26 kton fiducial mass, 92% IBD efficiency, and 6.4%/sqrt(E) MeV energy resolution, for a slow-liquid-scintillator detector that has not yet demonstrated these properties. The sentence quoted from Ref. [250] that 'IsoDAR will almost certainly make a discovery' is an overclaim; the manuscript should frame this as a projected sensitivity under stated assumptions and explicitly note the dependence on unvalidated detector performance.","section":"IV.A.7"},{"comment":"Many of the quantitative projections in the roadmap are drawn from a small set of studies, several of which are authored by the workshop organizers (e.g., Refs. [73, 191, 192, 250]). This is not inherently inappropriate for a workshop summary, but the text should clearly label which sensitivity estimates are peer-reviewed results, which are preliminary projections, and which depend on detector performance that has not yet been demonstrated. Currently the narrative does not always make these distinctions.","section":"IV.A.1 and IV.A.7"}],"minor_comments":[{"comment":"There are several typos, including 'leptophilic intractions' (should be 'interactions'), 'sterline' (Section IV.A.2), 'udpated' (Section IV.A.3), 'readioactivity' (Section VI.A), 'preformed' (Section IV.A.2), and 'flor' (Section IV.A.7, should be 'fluor').","section":"II.A"},{"comment":"The IsoDAR running time is given inconsistently: the text and Fig. 10 caption refer to both 4 years and 5 years of running for the 5 sigma sensitivity. These numbers should be reconciled.","section":"IV.A.7"},{"comment":"Reference [210] is incomplete, appearing only as '(2024).' with no title, authors, or journal information.","section":"IV.A.4"},{"comment":"The phrase 'Atmospheric collider gives a robust and universal flux source of BSM search' is unclear and should be reworded, presumably to refer to cosmic-ray collisions in the atmosphere.","section":"V.B"},{"comment":"The caption contains the typo 'Sesisitivity' instead of 'Sensitivity.'","section":"Fig. 12"}],"recommendation":"major_revision","confidential_remarks":"The manuscript appears to be a compilation of workshop contributions, and several sections have not been edited into a single coherent document. Section IV.A.7 in particular reproduces long passages from Ref. [250] with its internal numbering and repeats them, which is an editorial problem that should be resolved before external review. The heavy reliance on the organizers' own projections is not disqualifying for a workshop white paper, but the editor should require clear labeling of published results versus preliminary projections. I do not recommend rejection: the central qualitative claim is well supported by existing data, and the issues, while significant, are fixable within the scope of a revision."},"author_rebuttal":null,"desk_editor":{"model":"deepseek-v4-flash","letter":"Colleague,\n\nThe punchline: this is a workshop white paper, not a research paper. It maps the BSM landscape at neutrino facilities, with a useful East Asian emphasis, but it produces no new numerical result. Its value is organizational, as a broad and reasonably current synthesis, and that makes it worth a serious referee.\n\nWhat it does well: the taxonomy of lab-produced versus cosmogenic signals is clear; the coverage of current and future experiments is genuinely broad, from Super-K, T2K, IceCube, JSNS2, NEOS, NEON, and KamLAND-Zen to DAMSA, DUNE, the forward LHC program, SHiP, stopped-pion facilities, T2HK, Yemilab, and JUNO. It also credits recent experimental results like the NEON ALP and light dark matter limits, which already support the qualitative claim that neutrino facilities can probe BSM. The paper does not rest on a single unvalidated projection. The closing section on detector capabilities and simulation tools is a useful community service.\n\nThe soft spots are proportionate. The manuscript is editorially sloppy: Section IV.A.7 repeats the same IsoDAR table and figure-caption text three times, and typos like 'sterline,' 'preformed,' and 'Sesisitivity' appear throughout. A copyedit would fix that. More substantively, some quoted projections are presented with more confidence than warranted. The IsoDAR@Yemilab line that it 'will almost certainly make a discovery' comes from the source paper and reads as boosterism. The DAMSA sensitivity assumes a ten-order-of-magnitude suppression of beam-related-neutron backgrounds from GEANT4, while the paper's own staged plan puts proton-beam validation at Stage 3, not yet done. The IsoDAR reach assumes a 2.26 kton fiducial volume with 92 percent IBD efficiency in a slow-liquid-scintillator detector that has not yet demonstrated those properties. These should be labeled as design goals, not validated discovery potentials.\n\nThe self-referential citation pattern is not by itself a flaw—many projections come from the authors' own published studies, which are legitimate—but the review could have marked which curves are extrapolations and which rest on demonstrated detector performance.\n\nWho is this for? Experimentalists and theorists who want a quick map of planned BSM searches at neutrino facilities, especially in East Asia. It is a resource, not a result. I would send it to peer review, not desk reject, with revisions that clean the duplication, tone down the IsoDAR claim, and add caveats to the projected sensitivity plots.","headline":"A useful but under-edited workshop white paper that maps the BSM landscape at neutrino facilities; treat its sensitivity projections as design goals, not validated discovery potentials.","tokens_in":51501,"tokens_out":4179,"would_cite":false,"duration_ms":39196,"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":"Neutrino facilities can double as a broad search machine for new physics, this white paper argues.","keywords":["dark matter","axion-like particles","dark photons","sterile neutrinos","non-standard interactions","neutrino facilities","beam dump experiments","reactor neutrinos"],"falsifier":"A concrete test is to measure the beam-related neutron flux at the DAMSA target in the Stage 0 and Stage 3 validation runs; if the neutron-induced accidental diphoton rate exceeds the GEANT4 prediction by an order of magnitude at the proposed timing and vertex cuts, the DAMSA ALP sensitivity in the prompt-decay region would not hold. Likewise, a short-baseline reactor experiment with a gamma catcher such as RENE that fails to observe the predicted rate of the 3.685 MeV 13C de-excitation channel would undercut the proposed alternative probe of the 5 MeV bump.","tokens_in":50323,"feed_emoji":"⚛️","tokens_out":5513,"duration_ms":54763,"temperature":0.7,"pith_summary":"This white paper argues that the world's neutrino facilities, from accelerators and reactors to underground observatories, should be treated not only as tools for measuring neutrino oscillations but as a distributed machine for discovering physics beyond the Standard Model. It organizes the search landscape into laboratory-produced signals, such as dark photons, axion-like particles, light dark matter, sterile neutrinos, and non-standard interactions, and cosmogenic signals, such as boosted dark matter and neutrinos from dark-matter annihilation. The central claim is that the precision, timing, vertexing, and low-background capabilities being built for neutrino physics will reach unexplored parameter space for feebly interacting particles, often in regions connected to the dark-matter relic abundance and to anomalies like MiniBooNE, the reactor 5 MeV bump, and the Gallium deficit.","feed_headline":"Neutrino labs: a hidden frontier for dark matter and axions","feed_subtitle":"A roadmap shows how accelerator, reactor, and underground neutrino detectors could unlock new-physics discoveries.","key_machinery":"The organizing mechanism is the two-channel classification of BSM signals by production origin: laboratory-produced signals from beam targets, dumps, and reactor cores, and cosmogenic signals from the atmosphere, the Sun, and astrophysical sources. The carrying technical instruments are the detector configurations that make those channels observable: short-baseline beam dumps with fine vertexing and sub-nanosecond timing (DAMSA), movable near detectors with flavor identification (DUNE-ND, IWCD), forward emulsion and liquid-argon detectors at the LHC (FASERnu, SND@LHC, FLArE), fixed-target hidden-sector spectrometers (SHiP), stopped-pion sources with pulsed timing (COHERENT, CCM, JSNS2), and large liquid-scintillator or water-Cherenkov observatories (JUNO, nu-EYE, Hyper-Kamiokande, IceCube-Gen2). These configurations supply the timing resolution, vertex precision, particle identification, and background suppression on which all the proposed searches rest.","core_discovery":"The paper claims that neutrino facilities offer substantial potential to search for new physics beyond neutrino oscillations, owing to their precision measurement capabilities, diverse experimental configurations, and multiple neutrino sources. It documents how accelerator-based experiments produce dark-sector particles through exotic meson decays and beam-target interactions, how reactors supply intense photon and antineutrino fluxes for axion and dark-photon searches, and how large underground detectors can catch cosmogenic boosted dark matter and annihilation neutrinos. For each channel, it reviews current limits from Super-Kamiokande, T2K, IceCube, JSNS2, NEOS, NEON, and KamLAND-Zen, then presents projected sensitivities for next-generation facilities including DAMSA, DUNE-ND, LHC forward detectors, SHiP, stopped-pion experiments, T2HK, IsoDAR@Yemilab, RENE, JUNO, Hyper-Kamiokande, and IceCube-Gen2. The paper concludes that these programs collectively probe new parameter space for dark matter, axion-like particles, dark photons, sterile neutrinos, and non-standard interactions, and it lists the detector capabilities and simulation tools required to realize those searches.","pith_inferences":["If the roadmap is correct, the global neutrino program effectively becomes an intensity-frontier dark-sector program, and a shared framework for background modeling and limit-setting across beam dumps, reactors, and observatories would accelerate cross-checks of any candidate signal.","The paper's emphasis on East Asian facilities suggests a geographic shift in neutrino science, with Yemilab, JUNO, and Hyper-Kamiokande collectively forming a regional hub for new-physics searches; the paper implicitly calls for stronger collaboration among these experiments.","The proposed 13C de-excitation channel to probe the 5 MeV bump is a testable extension: a dedicated measurement at RENE or IsoDAR could discriminate between nuclear-physics and beyond-the-Standard-Model explanations of the excess.","The sensitivity projections rely on simplified background assumptions in several cases, so a public comparison of projected versus achieved backgrounds after the first physics runs would calibrate the entire roadmap."],"forward_implications":["If the projected sensitivities hold, a positive signal in any one channel, such as dark-matter-electron scattering at NEON or ALP decay to two photons at DAMSA, would be a discovery of physics beyond the Standard Model and could be cross-checked in the other listed facilities.","The combined program could cover light-mediator dark-matter parameter space consistent with the observed relic abundance, regions that direct-detection and collider experiments cannot currently reach.","Reactor-based detectors like JUNO-TAO and RENE would provide model-independent reference spectra that could resolve or sharpen the 5 MeV bump and the reactor antineutrino anomaly.","Forward detectors at the HL-LHC and SHiP would deliver first measurements of tau-neutrino and tau-antineutrino cross sections, enabling sterile-neutrino searches in the tau flavor.","Newly integrated simulation tools, such as GENIE-BDM and BeamHNL, would make BSM search projections reproducible and comparable across experiments."],"supporting_citations":[{"why":"Supplies the comprehensive landscape of BSM searches at neutrino experiments that frames the paper's two-channel organization.","marker":"[28]"},{"why":"Provides the projected sensitivities of Forward Physics Facility detectors, the basis for the LHC and HL-LHC forward-search claims.","marker":"[42]"},{"why":"Defines the Yemilab nu-EYE detector concept and its dark-photon, ALP, and light-dark-matter sensitivities, grounding the East Asian program claims.","marker":"[73]"},{"why":"Lays out the SHiP facility design and hidden-sector reach that the fixed-target search projections rely on.","marker":"[77]"},{"why":"Summarizes DUNE's BSM physics program, the basis for the DUNE-ND and DUNE-FD sensitivity statements.","marker":"[145]"},{"why":"Presents the original DAMSA beam-dump proposal and its ALP sensitivity estimates, central to the prompt-decay-region claims.","marker":"[191]"},{"why":"Provides the IsoDAR@Yemilab sterile-neutrino sensitivity calculation underlying the five-sigma reach claims.","marker":"[250]"},{"why":"Reports the NEON axion-like-particle limits that demonstrate reactor detectors probing the cosmological-triangle region.","marker":"[78]"}],"fun_headline_variants":["Neutrino detectors as dark sector discovery machines","Beyond oscillations: neutrino labs probe the dark universe","Accelerator, reactor, underground: new physics hiding in neutrinos","Dark matter and axions: what neutrino facilities could uncover","Neutrino facilities: a roadmap for BSM searches beyond oscillations"],"cache_read_input_tokens":3200,"weakest_assumption_plain":"The projected discovery reaches assume that next-generation detectors will actually achieve their specified background levels and efficiencies, for example that DAMSA's beam-related neutron background matches GEANT4 predictions pending its staged validation program, and that IsoDAR@Yemilab reaches a 2.26 kton fiducial volume with 92% inverse-beta-decay efficiency.","fun_headline_variants_meta":{"raw":{"variants":["Neutrino detectors as dark sector discovery machines","Beyond oscillations: neutrino labs probe the dark universe","Accelerator, reactor, underground: new physics hiding in neutrinos","Dark matter and axions: what neutrino facilities could uncover","Neutrino facilities: a roadmap for BSM searches beyond oscillations"]},"model":"deepseek-v4-flash","effort":"low","cost_usd":0.000895,"raw_usage":{"total_tokens":3893,"prompt_tokens":1016,"completion_tokens":2877,"prompt_tokens_details":{"cached_tokens":384},"prompt_cache_hit_tokens":384,"prompt_cache_miss_tokens":632,"completion_tokens_details":{"reasoning_tokens":2795}},"tokens_in":632,"tokens_out":2877,"duration_ms":21570,"temperature":1.0,"reasoning_tokens":2795,"cache_read_input_tokens":384,"cache_creation_input_tokens":0},"cache_creation_input_tokens":0},"created_at":"2026-08-15T19:36:27.615083+00:00","model_set":{"reader":"deepseek-v4-flash"},"falsifier":"A concrete test is to measure the beam-related neutron flux at the DAMSA target in the Stage 0 and Stage 3 validation runs; if the neutron-induced accidental diphoton rate exceeds the GEANT4 prediction by an order of magnitude at the proposed timing and vertex cuts, the DAMSA ALP sensitivity in the prompt-decay region would not hold. Likewise, a short-baseline reactor experiment with a gamma catcher such as RENE that fails to observe the predicted rate of the 3.685 MeV 13C de-excitation channel would undercut the proposed alternative probe of the 5 MeV bump.","supporting_citations":[],"review_version":2}