{"id":"fdd6e587-1767-4405-8189-090242d306c6","arxiv_id":"2412.14407","paper_version":3,"verdict":"CONDITIONAL","confidence":"MODERATE","novelty_score":5.0,"correctness_risk":"low","formal_verification":"none","parameter_count":1,"one_line_summary":"With 70% more data than its previous measurement, MicroBooNE finds no anomalous electron-neutrino interactions without pions and excludes the tested electron-like models of the MiniBooNE excess at more than 99% confidence.","lead":"MicroBooNE searched its full five-year dataset for extra electron-neutrino events that could explain MiniBooNE's low-energy excess. The data agree with the standard prediction, and two electron-like models of the excess are excluded at more than 99% confidence.","discovery_kind":"extension","skeptic_critique":{"model":"deepseek-v4-flash","headline":"The >99% CL_s exclusion is contingent on the assumption that LEE events populate the 1eNp0pi and 1e0p0pi channels in the same proportions as intrinsic CC nu_e; the paper's own 1e0p0pi-only CL_s values show the combined exclusion would not reach 99% if this hadronic-topology assumption fails.","rationale":"The paper is a careful, well-controlled measurement, and the statistical machinery (pseudo-data trials, CL_s, Feldman-Cousins intervals) is appropriate. The central result is internally consistent for the two benchmark models as defined. However, the headline claim that the measurement 'excludes an electron-like interpretation of the MiniBooNE excess' is broader than the models support. The most load-bearing condition is the explicit modeling choice, stated in the Signal Model section, that the MiniBooNE LEE signal is generated by scaling MicroBooNE's intrinsic CC nu_e prediction while leaving hadronic kinematics unchanged. This determines how much signal appears in the 1eNp0pi channel versus the 1e0p0pi channel. The paper's own Table I shows that the 1e0p0pi channel alone does not exclude either model at 99% CL_s (1 - CL_s = 43%, 23%, and 6.7% in the three variables), so the combined exclusion is carried by 1eNp0pi. The additional 24% deficit in 1eNp0pi (102 observed vs 133.5 +/- 7.4 predicted) makes that channel the least secure for a null-based exclusion. This is not an accusation of error; it is a scope limitation that is partly acknowledged by the phrase 'based on these models.' Because the paper is explicit about the model assumptions and the channel dependence, the reader's CONDITIONAL verdict remains appropriate. No change to the verdict is needed; the condition should be emphasized in any summary of the result, and the proposed test would settle whether the broader 'electron-like interpretation' wording is justified. I agree with the reader that the hadronic-kinematics assumption is the key weak point; the reader's secondary caveat about neglected signal-model systematics is also valid but secondary to the topology-assignment issue.","tokens_in":11867,"tokens_out":10002,"duration_ms":82094,"concrete_test":"Recompute the combined CL_s exclusion for both signal models with the LEE signal assigned exclusively to the 1e0p0pi selection (or with a proton-multiplicity model that puts no visible protons in the final state), preserving the electron kinematics and the full systematic covariance. If the combined 1 - CL_s rises above 1% -- as the paper's own 1e0p0pi-only rows in Table I suggest -- then the >99% exclusion is an artifact of the hadronic-topology assumption and the central claim must be reworded to apply only to LEE models with intrinsic-CC-nu_e proton multiplicity.","verdict_should_be":"UNCHANGED","load_bearing_attack":"Both signal models generate the MicroBooNE prediction by scaling the true electron kinematics of the intrinsic CC nu_e simulation while 'leaving the modeling of the hadronic kinematics unchanged' (Signal Model section). This fixes the proton-multiplicity split between the 1eNp0pi and 1e0p0pi selections to the Standard Model CC nu_e-on-argon prediction. The combined >99% CL_s exclusion is not robust to that assumption. In Table I, the 1e0p0pi channel alone excludes Model 1 at only 1 - CL_s = 43% (neutrino energy) and Model 2 at 23% (shower energy) and 6.7% (shower cos theta), whereas the combined values are 0.41%, 0.02%, and 0.014%. The combined result is therefore driven almost entirely by 1eNp0pi. If a true electron-like LEE had a different hadronic topology (e.g., no visible proton), the signal would sit mostly in 1e0p0pi, where the data are consistent with both H0 and H1, and the headline exclusion would fail. The paper's own text notes the 24% deficit in 1eNp0pi (102 observed vs 133.5 +/- 7.4 predicted), so the channel driving the exclusion is also the one whose null prediction is least secure; CL_s guards against downward data fluctuations but not against an upward bias in the H0 prediction. The abstract's 'electron-like interpretation' therefore overstates what the two benchmark models actually test.","agreement_with_reader":"agree"},"referee_report":{"model":"deepseek-v4-flash","summary":"This Letter analyzes the full five-year MicroBooNE dataset (1.11e21 POT) to search for excess charged-current electron-neutrino interactions without visible pions, motivated by the MiniBooNE low-energy excess. Two event selections are used, 1eNp0pi and 1e0p0pi, and the data are compared to the Standard Model prediction and to two empirical signal models derived from the MiniBooNE excess: Model 1 unfolds the excess in neutrino energy, and Model 2 unfolds it in shower energy and angle. The paper reports null-hypothesis p-values above 26.7% for the combined channels in all three kinematic variables, and combined CL_s exclusions of the two signal models at the 0.41%, 0.02%, and 0.014% level (1-CL_s), corresponding to >99% CL_s. The authors note that the 1e0p0pi channel alone yields much weaker exclusions and that the combined result is driven by 1eNp0pi.","tokens_in":12212,"tokens_out":4802,"duration_ms":43286,"significance":"If the benchmark exclusions are taken at face value, this is the strongest MicroBooNE statement to date against electron-like interpretations of the MiniBooNE LEE, using a 70% larger dataset than previous results, an expanded set of constraint channels, improved detector-systematics correlations, and a new two-dimensional signal model in shower energy and angle. The analysis is carefully executed: it uses sideband constraints, pseudo-data trials, the CL_s method, and Feldman-Cousins intervals, and it transparently reports the channel-by-channel results. The main value of the paper is the breadth of kinematic variables tested and the explicit construction of benchmark models that connect to MiniBooNE's observables. The reach of the conclusion, however, is bounded by assumptions in the signal-model construction that the paper itself only partially qualifies.","major_comments":[{"comment":"The signal prediction for both LEE models is obtained by scaling the true electron kinematics of MicroBooNE's intrinsic nu_e simulation while \"leaving the modeling of the hadronic kinematics unchanged.\" This fixes the relative populations of the 1eNp0pi and 1e0p0pi channels to the Standard Model CC nu_e-on-argon prediction. Table I shows that the 1e0p0pi channel alone excludes Model 1 at 1-CL_s = 43% (neutrino energy) and Model 2 at 23% (shower energy) and 6.7% (shower cos theta), while the combined values are 0.41%, 0.02%, and 0.014%. The combined >99% CL_s exclusion is therefore driven almost entirely by the 1eNp0pi channel. If an electron-like LEE had a different hadronic topology (for example, no visible proton), the signal would preferentially populate 1e0p0pi, where the data are compatible with both H0 and H1, and the headline exclusion would not hold. The abstract and conclusions should either restrict the claim to the specific hadronic-topology assumption of the models or present a quantitative study of the robustness of the exclusion to variations in the proton-multiplicity split.","section":"Signal model"},{"comment":"The paper states that the LEE signal models \"for simplicity neglect systematic uncertainty on the MiniBooNE LEE signal prediction.\" Since the central claim is an exclusion of these models at >99% CL_s, the H1 predictions used in the CL_s and signal-strength tests do not include uncertainties from the unfolding of the MiniBooNE excess or from the model-building procedure. Depending on the size of these uncertainties, the reported CL_s values could be overconfident. The authors should either propagate this uncertainty into the CL_s calculation or provide a quantitative argument, for example by varying the unfolded MiniBooNE excess within its uncertainties, that the effect on the reported exclusions is negligible.","section":"Signal model / Results"},{"comment":"The combined exclusion is driven by a channel in which the null prediction is itself in tension with data: the paper reports 102 observed events versus 133.5 +/- 7.4 predicted in 1eNp0pi, a 24% deficit with 2.4 sigma significance. The CL_s method protects against downward statistical fluctuations, but it does not protect against an upward bias in the H0 prediction. Because the sideband constraint increased the signal-channel predictions due to the underpredictions in the control samples, the robustness of the >99% CL_s exclusion depends on the absolute normalization of the constrained H0 prediction in 1eNp0pi. The paper should discuss what would happen to the exclusion if the null prediction in this channel were lower, for example by quoting a CL_s value with the constrained prediction renormalized to the data in a control region or by giving a sensitivity scan over the normalization of the 1eNp0pi prediction.","section":"Results"}],"minor_comments":[{"comment":"There is a spacing typo: \"withp-values\" should be \"with p-values\".","section":"Abstract"},{"comment":"The row labels in Table I, particularly \"obs.H 0 −H 1 ∆χ2\" and \"1 - CL s [%]\", are difficult to parse; the caption should define the test statistics and the CL_s quantity more explicitly.","section":"Table I"},{"comment":"The paper notes that the 1D projections used for Model 2 are not independent because the model is defined in two dimensions, but the discussion is brief; a sentence on the expected correlation between the shower-energy and shower-angle p-values would help readers interpret the two exclusions as related rather than independent measurements.","section":"Results"},{"comment":"The smoothing of detector-variation histograms with a pseudo-gaussian filter is described only briefly; since this can affect the bin-to-bin correlations and hence the sideband constraint, a one-sentence description of the smoothing width and its validation would improve reproducibility.","section":"Systematic uncertainties"},{"comment":"The statement that the LEE signal is treated \"in the same way as the electron-neutrinos selected\" for the sideband constraint deserves an explicit caveat: the constraint is derived from nu_mu and pi0 control samples, so it inherits the assumption that the LEE has the same response to those constraints as intrinsic CC nu_e events.","section":"Signal model"}],"recommendation":"major_revision","confidential_remarks":"This is a strong experimental result with transparent channel-by-channel reporting, and the central statistical machinery appears sound. The revision should focus on the scope of the headline claim: the abstract's 'electron-like interpretation' is broader than what the two benchmark models actually test, and the combined exclusion depends on the hadronic-topology assumption and on the omission of systematic uncertainty on the LEE signal prediction. These are fixable with text changes and supplementary quantitative checks, but they are load-bearing for the central claim and should be addressed before publication."},"author_rebuttal":null,"desk_editor":{"model":"deepseek-v4-flash","letter":"Colleague,\n\nThe short version: this is a solid, carefully executed exclusion of two electron-like interpretations of the MiniBooNE LEE, using the full five-year MicroBooNE dataset. The paper is honest about its assumptions, and the central result—>99% CL_s rejection of the energy-dependent Model 1 and the new shower-kinematics Model 2 in the combined sample—is supported by the numbers. The main caveat is that the combined exclusion is driven almost entirely by the 1eNp0pi channel, and the signal models force the hadronic topology split to match intrinsic CC nu_e. If the true excess had a different proton multiplicity (say, mostly no visible protons), the 1e0p0pi channel alone would not exclude it (43%, 23%, 6.7% CL_s for the three variables). The text actually says 'based on these models,' but the abstract's 'electron-like interpretation' is broader than what the models test.\n\nWhat's genuinely new: first measurement with all five years of MicroBooNE data (1.11e21 POT, 70% more than [4]), the new LEE Signal Model 2 unfolding the excess in 2D shower energy-angle, tests in three kinematic variables, improved constraints from muon and pi0 control samples, and wider use of the CRT. The analysis quality is high: frequentist p-values computed with pseudo-data trials, CL_s used to protect against the underfluctuation in 1eNp0pi, Feldman-Cousins intervals, and explicit discussion of the 24% deficit in 1eNp0pi (102 observed vs 133.5±7.4 predicted). That deficit is a real concern about the null prediction in the channel driving the exclusion, but the paper flags it and points to cross-section measurements.\n\nOther soft spots are minor: signal model uncertainties are neglected (stated upfront), and the 2D Model 2 tests are done on correlated 1D projections due to limited statistics. None of this changes my verdict that the paper is a careful, conservative measurement within its benchmark-model framework.\n\nWho should read it: anyone working on MiniBooNE/LSND explanations, neutrino cross-section modelers, and the broader oscillation community. It deserves a serious referee; I would send it to PRL or PRD without hesitation. My only request in review would be to tighten the abstract's wording to match the model-dependent scope of the exclusion, and to add a sentence or two quantifying how much of the combined CL_s comes from the 1eNp0pi channel.\n\nRecommendation: accept after minor revision.","headline":"A careful, incremental but important update that excludes two specific electron-like models of the MiniBooNE excess at >99% CL_s, with the abstract slightly overstating the breadth of that exclusion.","tokens_in":13733,"tokens_out":3308,"would_cite":true,"duration_ms":27326,"reading_group":"yes","serious_thinker":"yes","would_accept_peer_review":true},"rs_alignment":null,"lean_confirmation":null,"pith_extraction":{"msc":[],"pacs":[],"model":"deepseek-v4-flash","headline":"MicroBooNE's complete five-year dataset excludes an electron-like interpretation of the MiniBooNE low-energy excess at more than 99% confidence in every kinematic variable tested.","keywords":["MicroBooNE","MiniBooNE low-energy excess","charged-current electron neutrino interactions","liquid argon time projection chamber","CL_s exclusion","Booster Neutrino Beam","neutrino-nucleus cross section","anomalous low-energy excess"],"falsifier":"A concrete test: if a reprocessed MiniBooNE unfolding with updated efficiency and smearing produced an excess whose electron-energy and angle shapes, injected into MicroBooNE's simulation with full signal-model systematics, significantly improved the $\\chi^2$ of the $1e0p0\\pi$ channel relative to the null hypothesis, the paper's central exclusion would be contradicted. Alternatively, showing that the $1e\\mathrm{N}p0\\pi$ deficit vanishes under a corrected argon cross-section model while a Model-2-like excess appears in the data would overturn the conclusion.","tokens_in":11628,"feed_emoji":"⚛️","tokens_out":11802,"duration_ms":90036,"temperature":0.7,"pith_summary":"This paper asks whether the mysterious low-energy excess of electron-like events seen by MiniBooNE could be caused by an increased rate of charged-current electron-neutrino interactions without pions. Using the full five-year MicroBooNE dataset, which is 70% larger than previous results, it selects two final-state samples: one with visible protons and one without. The data agree with the standard prediction, with combined $p$-values $\\ge 26.7\\%$, although the prediction over-shoots the data in limited phase-space regions. Two benchmark signal models that embed the MiniBooNE excess as electron-neutrino events — one energy-dependent and one matched to shower energy and angle — are rejected at $>99\\%\\ \\mathrm{CL}_s$ in every kinematic variable tested. The conclusion is that the higher-resolution detector finds no support for an electron-like explanation of the MiniBooNE anomaly.","feed_headline":"Five years of MicroBooNE data rule out electron-like MiniBooNE excess","feed_subtitle":"With 70% more data and two signal models, no excess appears in any kinematic variable at >99% CL.","key_machinery":"The analysis is built on two signal selections — $1e\\mathrm{N}p0\\pi$ (at least one proton with kinetic energy above 40 MeV) and $1e0p0\\pi$ (no visible protons) — both requiring a single electron-like shower and no pions. The discriminating machinery is a sideband-constraint procedure that uses high-statistics $\\nu_\\mu$ control channels and a neutral-pion control sample, combined through the block matrix method, to reduce systematic uncertainty on the signal prediction by roughly 40%. The two low-energy-excess (LEE) signal models are the central objects: Model 1 unfolds the MiniBooNE excess as a function of reconstructed neutrino energy using a smearing matrix for charged-current quasi-elastic events, while the new Model 2 unfolds the excess in the two-dimensional space of reconstructed shower energy and $\\cos\\theta$ and applies the resulting scale factor to MicroBooNE's intrinsic $\\nu_e$ prediction without altering hadronic kinematics. Statistical conclusions come from frequentist pseudo-data trials, confidence intervals on a fitted signal strength, and the modified frequentist $\\mathrm{CL}_s$ method for two-hypothesis rejection.","core_discovery":"On the paper's own terms, the central discovery is that no anomalous excess of charged-current $\\nu_e$ interactions without visible pions appears in MicroBooNE's full dataset. The observed event counts are consistent with the nominal standard-model prediction under the null hypothesis, with frequentist $p$-values of 32%, 27%, and 44% for reconstructed neutrino energy, shower energy, and shower $\\cos\\theta$, respectively, for the combined channels. When the MiniBooNE excess is injected as a signal through either of two empirical models, the data prefer the null hypothesis, and the modified frequentist $\\mathrm{CL}_s$ method excludes the electron-like interpretation at $>99\\%$ confidence in all variables. The exclusion is driven mainly by the $1e\\mathrm{N}p0\\pi$ channel, which shows a 24% deficit relative to prediction (2.4$\\sigma$); the $1e0p0\\pi$ channel alone does not strongly discriminate. The paper concludes that MicroBooNE data are inconsistent with an electron-like interpretation of the MiniBooNE low-energy excess.","pith_inferences":["The exclusion is conditional on the benchmark models: an electron-like excess that produces different hadronic final states, or that modifies hadronic kinematics rather than only electron kinematics, would not be covered by this test, so the MiniBooNE anomaly remains open.","Because the paper neglects systematic uncertainty on the MiniBooNE LEE signal prediction, the $>99\\%$ CL$_s$ numbers should be read as conditional; including those uncertainties would likely soften the confidence levels, though probably not erase the rejection.","The 2.4$\\sigma$ deficit in $1e\\mathrm{N}p0\\pi$ suggests the simulation overpredicts proton-tagged $\\nu_e$ events; a corrected cross-section or hadronization model that removes this deficit would shift the background and could alter the CL$_s$ values in either direction.","The result complements sterile-neutrino searches by tightening constraints on $\\nu_e$ appearance interpretations of the LEE, while leaving $\\nu_e$ disappearance and photon-based explanations untouched."],"forward_implications":["The energy-dependent electron-neutrino enhancement (LEE Signal Model 1) is excluded at $>99\\%$ CL$_s$ when both signal channels are combined in reconstructed neutrino energy.","The new shower-energy/angle model (LEE Signal Model 2) is likewise excluded at $>99\\%$ CL$_s$ in both reconstructed shower energy and shower $\\cos\\theta$.","The $1e\\mathrm{N}p0\\pi$ channel provides most of the rejecting power; the observed 24% deficit in that channel (2.4$\\sigma$) is itself unexplained and motivates improved $\\nu_e$ cross-section models on argon.","In the $1e0p0\\pi$ channel alone the data are compatible with both the null hypothesis and a MiniBooNE-sized signal (best-fit signal strength up to 0.61), so the exclusion is not driven by that sample.","Since the two-hypothesis tests are limited by statistics, future reconstruction and analysis improvements could sharpen the exclusion or reveal a residual excess in the same final states."],"supporting_citations":[{"why":"Supplies the observed low-energy excess of electron-like events that this analysis is designed to test.","marker":"[1]"},{"why":"Defines the signal selections, event reconstruction, and LEE Signal Model 1, and gives the previous three-year results that this work extends.","marker":"[4]"},{"why":"Reports MiniBooNE's shower-energy and angle distributions, which motivate and calibrate the new LEE Signal Model 2.","marker":"[9]"},{"why":"Provides the tuned neutrino interaction model used for the central simulation of signal and background.","marker":"[20]"},{"why":"Documents the detailed construction of LEE Signal Model 2, the constraint covariance, and the validation tests.","marker":"[31]"},{"why":"Supplies the block matrix method used to constrain the signal prediction with control-channel data.","marker":"[32]"},{"why":"Provides the frequentist confidence-interval construction used for signal-strength fits.","marker":"[36]"},{"why":"Provides the modified frequentist CLs method used for two-hypothesis rejection.","marker":"[40]"}],"fun_headline_variants":["MicroBooNE's full dataset rules out electron-like MiniBooNE excess","No νe anomaly in five years of MicroBooNE data","MicroBooNE's full run finds no excess, excludes MiniBooNE bump","Five-year MicroBooNE data nix electron-neutrino excess","MicroBooNE full data exclude electron-like excess at >99% CL"],"cache_read_input_tokens":3200,"weakest_assumption_plain":"The load-bearing premise is that an electron-like MiniBooNE excess would appear in MicroBooNE as charged-current $\\nu_e$ interactions without visible pions in the two selected samples, with hadronic kinematics left unchanged from the standard simulation, and that systematic uncertainty on the signal models can be neglected.","fun_headline_variants_meta":{"raw":{"variants":["MicroBooNE's full dataset rules out electron-like MiniBooNE excess","No νe anomaly in five years of MicroBooNE data","MicroBooNE's full run finds no excess, excludes MiniBooNE bump","Five-year MicroBooNE data nix electron-neutrino excess","MicroBooNE full data exclude electron-like excess at >99% CL"]},"model":"deepseek-v4-flash","effort":"low","cost_usd":0.000843,"raw_usage":{"total_tokens":3725,"prompt_tokens":1053,"completion_tokens":2672,"prompt_tokens_details":{"cached_tokens":384},"prompt_cache_hit_tokens":384,"prompt_cache_miss_tokens":669,"completion_tokens_details":{"reasoning_tokens":2571}},"tokens_in":669,"tokens_out":2672,"duration_ms":18576,"temperature":1.0,"reasoning_tokens":2571,"cache_read_input_tokens":384,"cache_creation_input_tokens":0},"cache_creation_input_tokens":0},"created_at":"2026-08-11T12:16:16.522232+00:00","model_set":{"reader":"deepseek-v4-flash"},"falsifier":"A concrete test: if a reprocessed MiniBooNE unfolding with updated efficiency and smearing produced an excess whose electron-energy and angle shapes, injected into MicroBooNE's simulation with full signal-model systematics, significantly improved the $\\chi^2$ of the $1e0p0\\pi$ channel relative to the null hypothesis, the paper's central exclusion would be contradicted. Alternatively, showing that the $1e\\mathrm{N}p0\\pi$ deficit vanishes under a corrected argon cross-section model while a Model-2-like excess appears in the data would overturn the conclusion.","supporting_citations":[{"cited_title":null,"cited_arxiv_id":null,"evidence_quote":"Supplies the observed low-energy excess of electron-like events that this analysis is designed to test."},{"cited_title":"Abratenkoet al.(MicroBooNE Collaboration), Phys","cited_arxiv_id":null,"evidence_quote":"Defines the signal selections, event reconstruction, and LEE Signal Model 1, and gives the previous three-year results that this work extends."},{"cited_title":null,"cited_arxiv_id":null,"evidence_quote":"Reports MiniBooNE's shower-energy and angle distributions, which motivate and calibrate the new LEE Signal Model 2."},{"cited_title":"Abratenkoet al.(MicroBooNE Collaboration), Phys","cited_arxiv_id":null,"evidence_quote":"Provides the tuned neutrino interaction model used for the central simulation of signal and background."},{"cited_title":null,"cited_arxiv_id":null,"evidence_quote":"Documents the detailed construction of LEE Signal Model 2, the constraint covariance, and the validation tests."},{"cited_title":null,"cited_arxiv_id":null,"evidence_quote":"Supplies the block matrix method used to constrain the signal prediction with control-channel data."},{"cited_title":null,"cited_arxiv_id":null,"evidence_quote":"Provides the modified frequentist CLs method used for two-hypothesis rejection."}],"review_version":1}