{"id":"25d5da37-1f99-4ea6-b038-986b00a7abc6","arxiv_id":"2412.20026","paper_version":1,"verdict":"CONDITIONAL","confidence":"MODERATE","novelty_score":2.0,"correctness_risk":"medium","formal_verification":"none","parameter_count":1,"one_line_summary":"A simulation study reports that scalar non-standard interactions can enhance or suppress neutrino mass ordering sensitivity at DUNE, HK and KNO, with combined analyses giving the best sensitivity.","lead":"This paper simulates how a hypothetical scalar force between neutrinos and matter would affect the ability of the DUNE, Hyper-Kamiokande, and KNO experiments to determine the neutrino mass ordering. It reports that the effect can be sizable and that combining the three experiments improves the measurement.","discovery_kind":"extension","skeptic_critique":{"model":"deepseek-v4-flash","headline":"The SNSI parameterization in Eq. (3) does not specify whether η is density-scaled; if treated as a fixed constant, the claimed density-linear scaling and the DUNE vs. HK+KNO comparison lose support.","rationale":"The reader's weakest assumption concerns missing detector configurations, exposures, and systematics, which is a reproducibility concern. My concern is narrower and more directly tied to the physics implementation: the formal definition of the SNSI parameter is ambiguous about density scaling. This matters because the paper explicitly motivates scalar NSI by its linear scaling with matter density and then compares experiments at different baselines and densities. If η is not density-scaled, the comparison between DUNE and HK+KNO is not well-defined. This is a correctness risk rather than merely a missing-detail risk, and it strengthens the case for a conditional verdict: the authors should state the reference density and confirm the GLoBES implementation. I do not see grounds to reject the paper outright, because the physics could be correct and the full analysis is in a cited companion paper; but the proceedings as written does not yet allow an independent check of the central claim.","tokens_in":3587,"tokens_out":7754,"duration_ms":88088,"concrete_test":"Take the KNO baseline density profile and recompute the MO sensitivity for a fixed numerical value of ηee (e.g., 0.1) using two implementations: (i) δM = S_m ηee constant along the baseline, and (ii) δM = S_m ηee × n(x)/n_ref, where n_ref is an explicitly stated reference density and n(x) is the local matter density, as required by the linear density scaling claimed in the text. If the sign of the effect or the relative ordering of DUNE vs. HK+KNO sensitivities changes between (i) and (ii), the paper's cross-experiment conclusions depend on an unstated density normalization. Additionally, inspect the companion JHEP paper's GLoBES code to confirm which prescription was actually used and record the value of n_ref.","verdict_should_be":"UNCHANGED","load_bearing_attack":"The central quantitative claims compare experiments with different baselines and Earth densities, so the density dependence of the scalar NSI term is not a minor technicality. The text defines δM ≡ Σ_f n_f y_f y_αβ/m_φ², which is explicitly proportional to the ambient fermion density, but then Eq. (3) writes δM ≡ S_m η with a constant S_m and a dimensionless matrix η. These two definitions are compatible only if η itself is proportional to n_f, i.e., if η is defined at some reference density and rescaled at each point along the baseline. The proceedings never states a reference density or a rescaling prescription, and the description of the GLoBES implementation is absent. If the simulation instead treats ηee as a fixed, density-independent matrix element, then the 'linear scaling with matter density' advertised in the abstract is not implemented, and the relative MO sensitivities between DUNE (shorter baseline, lower density) and HK+KNO (different baselines and densities) could be distorted by an uncontrolled density-normalization convention. This ambiguity directly affects the paper's main claim that a positive (negative) ηee enhances (suppresses) MO sensitivity at DUNE and that the HK+KNO behavior depends on the combination of δCP and ηee. Because the paper is a proceedings summary, the ambiguity might be resolved in the cited JHEP paper, but as submitted the central claim is not internally consistent.","agreement_with_reader":"partial"},"referee_report":{"model":"deepseek-v4-flash","summary":"This manuscript, a proceedings contribution to NuFact 2024, studies how scalar non-standard interactions (SNSI) affect the neutrino mass ordering (MO) sensitivities of DUNE, HK+KNO, and their combination. Using GLoBES simulations and a chi-square defined in Eq. (4), the authors marginalize over oscillation parameters and the diagonal SNSI parameters η_ee, η_μμ, and η_ττ. They report that a positive (negative) η_ee enhances (suppresses) DUNE's MO sensitivity for true normal ordering, that the HK+KNO sensitivity depends on the combination of δ_CP and η_ee, and that combining DUNE with HK and KNO improves both the MO sensitivity and the precision of |Δm^2_31|. The paper is explicitly a summary of a longer JHEP publication (Ref. [6]).","tokens_in":3800,"tokens_out":6307,"duration_ms":59601,"significance":"If the reported effects are correct, they are relevant for interpreting future long-baseline data in the presence of SNSI and for planning the combination of DUNE with HK and KNO. The qualitative direction of the effects is plausible and consistent with known matter effects. A strength of the paper is that it is based on the GLoBES simulation framework and cites a companion JHEP paper for additional details. Nevertheless, as submitted the manuscript does not contain the figures or numerical tables that would allow the claims to be checked, and the lack of systematic uncertainties and the ambiguity in the SNSI density normalization are load-bearing issues. The paper would be of value to the proceedings audience once these points are clarified.","major_comments":[{"comment":"The definition δM ≡ Σ_f n_f y_f y_αβ / m_φ^2 is explicitly proportional to the ambient fermion density, but Eq. (3) replaces it by δM = S_m η with a constant S_m and a dimensionless matrix η. These two forms are compatible only if η itself is density-dependent, e.g., evaluated at a reference Earth density and rescaled along the baseline. The paper never states a reference density or a rescaling prescription, and no description of the GLoBES implementation of SNSI is given. Because DUNE and HK+KNO have different baselines and matter density profiles, the relative sensitivities claimed in Section 4 depend critically on this normalization. This is an internal inconsistency that directly affects the paper's central claim about enhanced or suppressed MO sensitivities.","section":"Section 2, Eq. (3)"},{"comment":"The quantitative results are presented only as figure captions; the figures themselves are not included in the manuscript as provided, and no numerical values for the MO sensitivity or the |Δm^2_31| precision are reported. The sentences describing 'MO sensitivities in the presence of η_ee' and 'the precision measurement of Δm^2_31' cannot be verified or reproduced from the text. For the claims to be assessable, the figures or a table of numerical results need to be included.","section":"Section 4, Figs. 1-2"},{"comment":"The chi-square in Eq. (4) contains no systematic uncertainties, and the manuscript lists no detector parameters (exposures, efficiencies, energy resolutions, backgrounds) for DUNE, HK, or KNO. The text states that the analysis marginalizes over δ_CP, θ23, and η_ee, but Eq. (4) shows only a minimization over η. The absence of systematics is especially problematic because the claimed SNSI-induced modifications to MO sensitivity are relative effects that could be degenerate with systematic errors in event rates.","section":"Section 3, Eq. (4)"}],"minor_comments":[{"comment":"The word 'Yukuwa' should be 'Yukawa'.","section":"Section 2"},{"comment":"The expression 'Sm = √(2.5 × 10^{-3} eV^2 ≈ 0.05 eV' is notationally confusing; it should be written as 'S_m = √(2.5 × 10^{-3}) eV ≈ 0.05 eV'.","section":"Section 2"},{"comment":"The equation uses 'min_η' but the surrounding text says the marginalization is over δ_CP, θ23, and η_ee; please align the notation.","section":"Section 3, Eq. (4)"},{"comment":"The captions of Figs. 1 and 2 do not define the line styles, colors, or panels; please add legend information.","section":"Section 4, Figs. 1-2"},{"comment":"The claim that SNSI 'allows for the exploration of absolute neutrino masses via oscillation experiments' is not supported by anything in the text; please clarify or remove this statement.","section":"Abstract"},{"comment":"As a proceedings summary, the paper refers to the companion JHEP paper (Ref. [6]); for reproducibility, the assumed values of the SNSI parameters η_ee, η_μμ, and η_ττ should be stated or explicitly referenced.","section":"Throughout"}],"recommendation":"major_revision","confidential_remarks":"The manuscript is a two-page workshop contribution that largely summarizes the authors' JHEP paper. The main concern is that, as submitted, it is not self-contained: the figures are absent, the chi-square omits systematics, and the SNSI density normalization is ambiguous. The paper may be suitable for a conference proceedings after major revision, but it does not meet the standard of a full research article. The editor should consider whether the scope of the journal includes such short summaries."},"author_rebuttal":null,"desk_editor":{"model":"deepseek-v4-flash","letter":"This is a four-page workshop write-up that restates the results of the group's earlier JHEP 2024 paper (Ref. [6]) without adding new equations, data, or method. If you want to evaluate the claims, you need the JHEP version; this document alone is under-specified.\n\nWhat's actually useful: the SNSI formalism follows Ge and Parke correctly, the benchmark oscillation parameters are standard NuFit values, and the qualitative statements — positive ηee enhances DUNE's mass-ordering sensitivity, the HK+KNO behavior depends on δCP and ηee, and the combination improves |Δm²31| precision — are plausible and consistent with the published analysis. For a workshop record, it's a decent summary.\n\nWhere it's soft: the paper gives no detector configuration (exposures, efficiencies, backgrounds, energy resolution), and Eq. (4) is a simple chi-square with no systematic terms. The figures are only captions in the text, and no numeric sensitivity values are reported. That means the central evidence cannot be inspected from this submission alone. The density-scaling point raised in the stress-test is legitimate: δM is defined as proportional to n_f, then written as Sm·η with constant Sm and dimensionless η, but no reference density or rescaling prescription is given. For a comparison between DUNE and HK+KNO, which see different density profiles, this is a real ambiguity. It may well be handled correctly in the JHEP paper, but the proceedings should at least state the convention. This is a soft spot, not a fatal flaw.\n\nThe bigger issue is novelty: everything reported here already appears in Ref. [6] by the same authors. The abstract does not claim to go beyond it. So as a research paper it contributes nothing new, but it is an honest summary and not incoherent.\n\nWho this is for: someone who wants a quick record of this group's talk or a pointer to the JHEP analysis, not someone trying to verify or reproduce the result. I would not cite it; the JHEP paper is the citable source. A reading group could skip it.\n\nRecommendation: desk-reject as a standalone research submission; it doesn't deserve referee time because it has no new content and insufficient detail. If the venue is a non-refereed proceedings, that's fine.","headline":"A concise proceedings restatement of the group's own JHEP 2024 analysis; no new results, under-specified on its own, but qualitatively plausible and honest.","tokens_in":4410,"tokens_out":3279,"would_cite":false,"duration_ms":32751,"reading_group":"no","serious_thinker":"yes","would_accept_peer_review":false},"rs_alignment":null,"lean_confirmation":null,"pith_extraction":{"msc":[],"pacs":[],"model":"deepseek-v4-flash","headline":"The paper claims that scalar-mediated neutrino non-standard interactions, parameterized by the diagonal element ηee, can enhance or suppress neutrino mass ordering sensitivity at DUNE and HK+KNO, and that combining the experiments…","keywords":["Neutrino oscillation","Beyond Standard Model","Non-standard interactions","Scalar NSI","Mass ordering","DUNE","Hyper-Kamiokande","KNO"],"falsifier":"A definitive test would be to measure ηee independently, for example in a short-baseline or scattering experiment, and then check whether DUNE's observed ability to distinguish normal from inverted ordering rises for a positive ηee and falls for a negative one exactly as predicted; a mismatch between predicted and observed sensitivity as a function of the sign and magnitude of ηee would falsify the central claim.","tokens_in":3354,"feed_emoji":"⚛️","tokens_out":7443,"duration_ms":68809,"temperature":0.7,"pith_summary":"This paper tries to establish that scalar-mediated neutrino non-standard interactions (scalar NSI), specifically the diagonal parameter ηee, can materially change how well the long-baseline experiments DUNE, Hyper-Kamiokande (HK) and Korea Neutrino Observatory (KNO) can determine the neutrino mass ordering. If scalar NSI exists and is parameterized as in the paper, mass-ordering sensitivity is not a fixed property of each experiment: at DUNE a positive ηee boosts sensitivity while a negative one suppresses it, and at HK+KNO the outcome depends on the CP phase and the value of ηee. The paper also argues that combining DUNE with HK and KNO restores and improves sensitivity, and sharpens the precision on the atmospheric mass splitting |Δm²31|. This matters because mass-ordering determination is a central goal of these experiments, and a standard-only analysis could misread the data if scalar NSI is present.","feed_headline":"Scalar neutrino interactions reshape mass-ordering sensitivity","feed_subtitle":"The sign of the scalar coupling decides whether DUNE, HK and KNO can determine the neutrino mass ordering.","key_machinery":"The machinery is the effective Hamiltonian in matter with a scalar-mediated interaction, H_SNSI = Eν + Meff Meff†/(2Eν) ± V_SI, where Meff = M + δM and δM equals the dimensionless SNSI matrix η times the mass scale Sm. The parameterization sets Sm ≈ 0.05 eV, so the scalar NSI effect is a matter-density-proportional perturbation to the mass matrix rather than to the potential. This perturbation changes the oscillation probabilities, and the paper tracks its consequences through the χ² statistic of Eq. (4), comparing event rates from a true ordering against a test ordering while marginalizing over δCP, θ23, and ηee.","core_discovery":"The paper's central discovery is that the scalar NSI contribution, entering as a medium-dependent shift of the neutrino mass matrix δM = Sm η, changes the effective oscillation Hamiltonian and therefore the reconstructed mass-ordering sensitivity at each experiment. Concretely, with normal ordering as true, DUNE's sensitivity is enhanced by positive ηee and suppressed by negative ηee relative to the standard-interactions case; for inverted ordering the sensitivity is likewise shifted. For HK+KNO the effect is not monotone: it depends on the combination of δCP and ηee. Combining the three experiments improves the sensitivity for positive ηee under normal ordering and yields tighter constraints on |Δm²31| than any single experiment for all three diagonal SNSI elements ηee, ημμ, and ηττ.","pith_inferences":["If a positive ηee is real but unaccounted for, an experiment like DUNE could overstate its confidence in normal ordering, since the boost looks like a stronger signal; conversely, a negative ηee could hide a true normal ordering behind a suppressed sensitivity.","The HK+KNO dependence on the δCP–ηee combination suggests that these two parameters are partially degenerate, so a joint analysis over both, rather than separate marginalizations, is needed to avoid biasing the inferred ordering.","A cross-baseline consistency check would be a sharp test: because scalar NSI scales linearly with matter density, the value of ηee reconstructed from DUNE should match that from HK and KNO if the model is correct; disagreement would point to missing physics or an incorrect SNSI parameterization.","The results imply that in the presence of scalar NSI, 'mass ordering sensitivity' is not a single number for an experiment; the community would need to quote sensitivity maps over the SNSI parameter space rather than point values."],"forward_implications":["If scalar NSI is present, DUNE's mass-ordering sensitivity is sign-dependent: a positive ηee boosts it for normal ordering, while a negative ηee suppresses it, so a weak or null ordering signal could be a new-physics effect rather than a statistical fluke.","For HK+KNO, the mass-ordering sensitivity cannot be quoted without specifying δCP and ηee; interpretations of these experiments' ordering reach must be made within a joint parameter plane.","Combining DUNE, HK and KNO recovers sensitivity that each experiment alone may lose and improves the precision of |Δm²31| for each of the diagonal scalar NSI elements considered.","The linear scaling of scalar NSI with matter density means that the same new physics produces larger effects at longer baselines or denser matter, so comparisons across experiments of different baselines encode information about the scalar coupling.","If these claims hold, future global fits that include these experiments will need to treat scalar NSI parameters as nuisance parameters or external inputs, not ignore them."],"supporting_citations":[{"why":"Defines the scalar NSI effective Hamiltonian and the δM parameterization used in Eq. (3).","marker":"[1]"},{"why":"Supplies the DUNE far-detector specifications used to simulate event rates.","marker":"[4]"},{"why":"Supplies the second Hyper-Kamiokande detector in Korea (KNO) configuration used for the HK+KNO simulation.","marker":"[5]"},{"why":"Presents the earlier analysis of scalar NSI effects on mass ordering at these experiments that this work extends.","marker":"[6]"},{"why":"Provides the simulation package used to compute the expected neutrino event rates for the sensitivity study.","marker":"[7]"},{"why":"Supplies the benchmark values of the oscillation parameters used in the analysis.","marker":"[8]"}],"fun_headline_variants":["Scalar NSI sign decides mass ordering sensitivity at DUNE","Combining DUNE, HK, KNO sharpens mass ordering from scalar NSI","Sign of scalar coupling alters mass ordering reach for DUNE, HK, KNO","Scalar NSI effects on mass ordering: DUNE boosted, HK+KNO interplay","Neutrino mass ordering sensitivity shifts with scalar NSI sign"],"cache_read_input_tokens":3200,"weakest_assumption_plain":"The predictions assume the simulated detector responses for DUNE, HK and KNO are accurate and that the scalar NSI parameters are already known from other non-long-baseline experiments; if either assumption fails, the claimed enhancements and suppressions of mass-ordering sensitivity would not be the observed ones.","fun_headline_variants_meta":{"raw":{"variants":["Scalar NSI sign decides mass ordering sensitivity at DUNE","Combining DUNE, HK, KNO sharpens mass ordering from scalar NSI","Sign of scalar coupling alters mass ordering reach for DUNE, HK, KNO","Scalar NSI effects on mass ordering: DUNE boosted, HK+KNO interplay","Neutrino mass ordering sensitivity shifts with scalar NSI sign"]},"model":"deepseek-v4-flash","effort":"low","cost_usd":0.000895,"raw_usage":{"total_tokens":3859,"prompt_tokens":949,"completion_tokens":2910,"prompt_tokens_details":{"cached_tokens":384},"prompt_cache_hit_tokens":384,"prompt_cache_miss_tokens":565,"completion_tokens_details":{"reasoning_tokens":2810}},"tokens_in":565,"tokens_out":2910,"duration_ms":21610,"temperature":1.0,"reasoning_tokens":2810,"cache_read_input_tokens":384,"cache_creation_input_tokens":0},"cache_creation_input_tokens":0},"created_at":"2026-08-10T23:38:36.584145+00:00","model_set":{"reader":"deepseek-v4-flash"},"falsifier":"A definitive test would be to measure ηee independently, for example in a short-baseline or scattering experiment, and then check whether DUNE's observed ability to distinguish normal from inverted ordering rises for a positive ηee and falls for a negative one exactly as predicted; a mismatch between predicted and observed sensitivity as a function of the sign and magnitude of ηee would falsify the central claim.","supporting_citations":[{"cited_title":"Impact of scalar NSI on the neutrino mass ordering sensitivity at DUNE, HK and KNO","cited_arxiv_id":null,"evidence_quote":"Presents the earlier analysis of scalar NSI effects on mass ordering at these experiments that this work extends."},{"cited_title":null,"cited_arxiv_id":null,"evidence_quote":"Supplies the benchmark values of the oscillation parameters used in the analysis."}],"review_version":1}