{"id":"8f7190e6-a76e-489b-915d-8ef39fda988c","arxiv_id":"2509.14378","paper_version":2,"verdict":"CONDITIONAL","confidence":"MODERATE","novelty_score":6.0,"correctness_risk":"medium","formal_verification":"none","parameter_count":4,"one_line_summary":"At a 350 GeV electron-positron collider, a 150 GeV charged scalar in the real triplet Higgs model can be discovered with less than 1 fb^-1 and its mass measured to about 1 GeV at 500 fb^-1.","lead":"This paper calculates how quickly future electron-positron colliders could discover the 150 GeV charged scalar predicted by a Higgs triplet model, using three final-state signatures. It reports that a discovery could come with less than one inverse femtobarn of data, and that the scalar mass could be measured to about one GeV at high luminosity.","discovery_kind":"new_application","skeptic_critique":{"model":"deepseek-v4-flash","headline":"The paper's <1 fb^-1 SR1 claim rests on an unquantified assumption that WW/WZ and multi-jet backgrounds are negligible; a few fb of omitted background would shift the 5σ luminosity above 1 fb^-1.","rationale":"The reader's CONDITIONAL verdict is appropriate, and my stress-test identifies the same family of concern but locates it one step earlier: the assumption that VV and multi-jet backgrounds are negligible is made before the DNN and is never tested. The headline '<1 fb^-1' in SR1 is computed from s=28.45 fb and b=3.67 fb after the DNN, and the DNN was trained only on VVV. A background contribution of a few fb would move the discovery luminosity from below 1 fb^-1 to several fb^-1; a 20 fb contribution would push it well above the quoted value. Since sigma(WW) at 350 GeV is orders of magnitude larger than the quoted background, this is a genuine open question rather than a stylistic quibble. SR3 is even less protected: no lepton requirement, and Table 7 gives no process breakdown, so the mass-peak visibility and the 17 fb^-1 figure are also potentially affected. The theta<9.38 deg acceptance in Table 1 is almost certainly a direction typo (probably theta>9.38 deg or |eta|<2.44), but it should be corrected for reproducibility; it is not the main issue. The 20% systematic is less load-bearing because the quoted significances plateau well above 5 sigma for the stated yields under a reasonable range of delta_b. A single expanded background simulation campaign would settle the concern, so the paper should remain CONDITIONAL pending that check.","tokens_in":18587,"tokens_out":18378,"duration_ms":165089,"concrete_test":"Regenerate the SR1 and SR3 background samples at sqrt(s)=350 GeV using the same MadGraph/Pythia/Delphes (ILD) pipeline, now including e+e- -> WW, WZ, ZZ, qqbar, and qqbar+jet (with tau fake and real tau decays) in addition to VVV, and apply the exact selections of Tables 3 and 7, including the DNN score>0.7 for SR1. Compare the resulting post-selection background cross-sections to 3.67 fb (SR1) and 0.41 fb (SR3); if either increases by more than about 2 fb or 0.5 fb respectively, recompute the 5sigma luminosities and the SR3 mass-fit uncertainty using Eq. 4.4.","verdict_should_be":"UNCHANGED","load_bearing_attack":"Section 4 states that 'the presence of a lepton and at least 3j ... reduces the multi-jet and di-boson background significantly, and hence we do not consider them.' This argument is not quantified and does not even nominally apply to SR3, which has no lepton requirement. In SR1 (Table 3) only VVV is listed as background: 8.76 fb before the DNN and 3.67 fb after a DNN score cut of 0.7. Since the DNN was trained against VVV only, its rejection of WW/WZ/ZZ events is unknown. At sqrt(s)=350 GeV, sigma(e+e- -> WW) is at the picobarn level, two to three orders of magnitude above the quoted 3.67 fb; a survival probability of only 10^-3 after the extra jet requirement and the DNN would add several fb of background. If such a contamination is present, the background-dominated significance drops and the claimed '<1 fb^-1' discovery luminosity would not hold. For SR3, Table 7 reports a single background number (1.25 fb after preselection, 0.41 fb after all cuts) with no process breakdown; WW->4j+tau_fake, ZZ->4j+tau_fake, and qqbar final states are not addressed by the stated lepton-based suppression argument. The mass-measurement claim could still survive if the added background is smooth, but the quoted 5sigma luminosity of about 17 fb^-1 and the reported precision would need revision. The 20% systematic in Eq. 4.4 is secondary; the missing background budget is the primary load-bearing issue.","agreement_with_reader":"partial"},"referee_report":{"model":"deepseek-v4-flash","summary":"The paper studies the discovery prospects of the charged scalar Δ± in the real Higgs triplet model (ΔSM) at a future e+e− collider with √s = 350 GeV, focusing on the benchmark mΔ± ≈ 150 GeV motivated by anomalies near 152 GeV. The authors define three signal regions: SR1 (≥3 jets + 1 lepton), SR2 (≥3 leptons + τhad), and SR3 (≥4 jets + τhad), corresponding to different decay chains of the pair-produced Δ±. Using MadGraph5, Pythia8, and Delphes3 with the ILC detector card, they compute signal and background cross sections, apply a DNN for SR1 and SR2, and a cut-based analysis for SR3. They report that a 5σ discovery can be reached in SR1 with less than 1 fb−1, that SR2 is very clean, and that SR3 allows the charged scalar mass to be measured with a statistical uncertainty of ≈750 MeV at 500 fb−1. The paper also provides analytic expressions for the relevant decay widths and normalized kinematic distributions in appendices.","tokens_in":1778,"tokens_out":1996,"duration_ms":69149,"significance":"If the background estimates are reliable, the paper makes a strong case that a 350 GeV e+e− collider can discover a 150 GeV charged scalar and measure its mass with O(1) GeV precision using far less data than needed at the LHC, where this state is difficult to detect because its WZ, tb, and τν decay modes produce soft or missing particles. The analysis uses standard, publicly available simulation tools, defines signal regions clearly, and provides explicit tables of fiducial cross sections, which is a strength and makes the claim falsifiable. The main caveat is that the background budget is incomplete: the argument used to dismiss di-boson and multi-jet backgrounds explicitly relies on a lepton requirement, yet SR3 has no such requirement, and the DNN for SR1 is trained only against VVV backgrounds. If additional backgrounds contribute at the level of a few fb, the claimed discovery luminosities and the mass-measurement accuracy would need revision. This concern is concrete and can be resolved by including a more complete set of background processes in the revised manuscript.","major_comments":[{"comment":"The background budget for SR3 is incomplete and this directly undermines the claimed sensitivity. The text states that 'the presence of a lepton and at least 3j in the final state reduces the multi-jet and di-boson background significantly, and hence we do not consider them,' but SR3 (≥4j + τhad) has no lepton requirement. Table 7 reports a single total background number (1.25 fb after preselection, 0.41 fb after all cuts) with no process decomposition. At √s = 350 GeV, the e+e− → WW cross section is of order picobarn, and even a survival probability of 10^-3 after the four-jet and τhad selections would add roughly a femtobarn to the SR3 background, more than doubling the quoted 0.41 fb. This would inflate the luminosity needed for 5σ from the claimed L ≈ 17 fb−1 and could also affect the mass reconstruction if the additional background is not smooth. The authors should provide a table listing all simulated background processes (WW, WZ, ZZ, qqbar, etc.) with their cross sections before and after each SR3 cut, or give a quantitative argument for their absence.","section":"Section 4, Table 7"},{"comment":"The SR1 DNN is trained only against VVV backgrounds, so its rejection power for WW/WZ/ZZ and multi-jet events is unknown. The fiducial VVV background after the DNN score cut of 0.7 is 3.67 fb, but the cross section for e+e− → WW at 350 GeV is orders of magnitude larger; a survival probability of only 10^-3 would add several fb of background. Since the central claim is that 5σ is reached with less than 1 fb−1, this is load-bearing. The authors should include WW, WZ, ZZ, and multi-jet samples in the DNN training and report their efficiencies, or otherwise demonstrate that these processes do not populate the ≥3j + 1ℓ phase space. Without this, the claimed discovery luminosity cannot be taken at face value.","section":"Section 4.1, Table 3"},{"comment":"The acceptance condition θ < 9.38° applied to jets, leptons, and τhad appears to be a typo. Taken literally, it restricts all objects to a 9.38° cone around the beam axis, which would exclude the central region where the signal predominantly lies; for a typical e+e− detector with |cosθ| < 0.99 the intended condition is presumably θ > 9.38°. This is not merely a cosmetic issue: the quoted cross sections in Tables 3, 5, and 7 depend on the actual angular acceptance used in the simulation. The authors should correct this definition and confirm that the numbers were obtained with the intended acceptance.","section":"Table 1"}],"minor_comments":[{"comment":"The abstract states that 5σ is achieved in SR1 with 'less than 1 fb−1', while the Conclusions state '0.3 fb−1'. These numbers should be harmonized, or the discrepancy should be explained (e.g., different benchmark mass or systematic assumptions).","section":"Abstract and Conclusions"},{"comment":"The caption of Fig. 10 uses mΔ± = 152 GeV, while the body of the paper uses mΔ± ≈ 150 GeV as the benchmark. Please make the mass values consistent.","section":"Figure 10"},{"comment":"In Table 2, the variable 'mj2,j3' is defined as the invariant mass of 'the 2nd and 2rd leading jets'; this should be '2nd and 3rd'.","section":"Table 2"},{"comment":"The systematic uncertainty δb is assumed to be 20% with the statement 'Without delving into the details of estimating δb, we conservatively assume it to be 20%.' Since the significance formula is sensitive to δb, a brief justification based on object reconstruction or a range of values (e.g., 10–30%) would strengthen the analysis.","section":"Equation (4.4)"}],"recommendation":"major_revision","confidential_remarks":"The main technical concern is the incomplete background budget for SR3 and the DNN training for SR1 against VVV only. These are fixable with additional simulations and a more detailed background table, but they are load-bearing for the central discovery and mass-measurement claims. The paper is within the scope of the journal and the analysis framework is standard; once the background composition is clarified, the results may be publishable."},"author_rebuttal":null,"desk_editor":{"model":"deepseek-v4-flash","letter":"You should know two things about this paper. First, it is the first dedicated e+e- collider study of pair-produced charged scalars in the real Higgs triplet model, and it makes a concrete, testable claim: at 350 GeV, 5 sigma in SR1 (>=3j+1l) with under 1 fb^-1, and a ~750 MeV statistical mass measurement in SR3 (>=4j+tau_had) at 500 fb^-1. Second, the central calculation is coherent and uses standard tools (MadGraph/Pythia/Delphes with the ILC card), so the projection is plausible if the background budget is right. The benchmark mass and triplet VEV come from the same group's anomaly fits, so the motivation is not independent, but the projection itself is not circular: they take the model parameters as inputs and compute significance from cross sections and branching ratios.\n\nThe genuinely new piece is the application to Delta± pair production at e+e- machines, with three optimized signal regions and a mass reconstruction channel. That is a legitimate contribution, and the DNN-based discrimination in SR1 and SR2 looks competent; the ROC curves and the cross-section tables are internally consistent. SR2 is clean and the reported 5-sigma at 500 fb^-1 is unsurprising given the tiny background.\n\nThe soft spots are real but concentrated. The big one is the background budget. In Section 4 the authors say a lepton plus at least 3 jets reduces multi-jet and di-boson backgrounds, and therefore they do not consider them. That argument does not apply to SR3, which has no lepton requirement, yet Table 7 lists only a single background number, 1.25 fb after preselection and 0.41 fb after cuts, with no process breakdown. At sqrt(s)=350 GeV, sigma(e+e- -> WW) is at the picobarn level, so even a 10^-3 survival rate after the >=4j+tau_had selection adds several fb. If any such contamination survives, the 5-sigma luminosity of 17 fb^-1 and the mass resolution claim need revision. The same concern applies to SR1, where only VVV is simulated and the DNN is trained only against VVV, so its rejection of WW/WZ is unknown. The 20% background systematic is also assumed without derivation, but that is a secondary issue compared to missing backgrounds. Minor issues: the acceptance condition theta < 9.38 degrees in Table 1 looks like a direction error (it should presumably be theta > some cut or |eta| < something), and there are no analysis artifacts or cutflows for the DNN inputs, which would help reproduction.\n\nWho is this for? Collider phenomenologists working on Higgs triplet models or on future e+e- physics, and experimental colleagues at CEPC/FCC-ee/ILC planning search strategies. It deserves a serious referee: the topic is timely, the question is quantitative, and the flaws are fixable rather than fatal. I would accept it with major revision, asking for a complete background list in SR1 and SR3, a reconsideration of the lepton-based argument, and a corrected or clarified acceptance cut. If the backgrounds hold up, the <1 fb^-1 claim is an important result; if not, the paper still provides a useful framework.\n\nMy bottom line: worth engaging, worth citing once the background question is settled. Send it to a competent referee.","headline":"A useful, mostly standard e+e- projection for the 150 GeV charged triplet scalar, but the SR1 and SR3 background budgets are incomplete enough that the headline <1 fb^-1 claim needs a check before being quoted.","tokens_in":19512,"tokens_out":1051,"would_cite":true,"duration_ms":11116,"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":"A 150 GeV charged scalar in the real Higgs triplet model can be discovered at a 350 GeV e+e- collider with under 1 fb^-1, and its mass measured to about 750 MeV.","keywords":["real Higgs triplet model","charged Higgs","future e+e- collider","152 GeV excess","multi-lepton anomalies","signal regions","mass reconstruction","Drell-Yan production"],"falsifier":"Run the SR1 selection on 1 $fb^{-1}$ of 350 GeV e+e- data and observe no excess: the claimed 5σ discovery would fail. Equally, a complete simulation of SM backgrounds for SR3 (including WW/WZ/ZZ, triboson, ttbar, and multi-jet production) that yields a post-cut background above the 0.41 fb used in Table 7 would invalidate the 17 $fb^{-1}$ discovery projection and the ≈750 MeV mass error.","tokens_in":18323,"feed_emoji":"⚛️","tokens_out":11475,"duration_ms":85109,"temperature":0.7,"pith_summary":"The paper argues that the charged scalar of the real Higgs triplet model, the $\\Delta^\\pm$, with mass around 150 GeV, can be discovered at a future $e^+e^-$ collider running at $\\sqrt{s}=350$ GeV with remarkably little data: a $5\\sigma$ discovery in the $\\ge 3j+1\\ell$ signal region with less than $1\\text{ fb}^{-1}$, and a clean $\\ge 3\\ell+\\tau_{\\mathrm{had}}$ channel for confirmation. It further argues that a fully hadronic signal region, $\\ge 4j+\\tau_{\\mathrm{had}}$, allows the charged scalar mass to be reconstructed from the $W^\\pm Z$ and $\\tau\\nu$ decays, with a statistical uncertainty of about 750 MeV at $500\\text{ fb}^{-1}$. This matters because the LHC has difficulty seeing the $\\Delta^\\pm$: its $\\tau\\nu$ decays mimic stau-like signatures and its $WZ$ decays produce soft objects, so current data only exclude a narrow mass window around 200-220 GeV. If correct, a future lepton collider would not only discover the charged partner of the 152 GeV excesses but also measure its mass directly.","feed_headline":"1 fb^-1 can find the 150 GeV charged Higgs at e+e- colliders","feed_subtitle":"SR1 finds it in under 1 fb^-1; SR3 measures its mass to about 1 GeV.","key_machinery":"The load-bearing object is the charged scalar $\\Delta^\\pm$ of the $Y=0$ real Higgs triplet model, produced at an $e^+e^-$ collider through Drell-Yan pair production via $\\gamma^*/Z^*$, and decaying predominantly to $W^\\pm Z$, $\\tau\\nu$, and $tb$. The analysis is carried by three signal regions built from those decays: a high-rate hadronic-plus-lepton channel (SR1), a clean three-lepton-plus-tau channel (SR2), both classified with a deep neural network, and a fully hadronic four-jet-plus-tau channel (SR3) in which the four jets from $W^\\pm Z\\to4j$ are combined with the $\\tau_{\\mathrm{had}}$ (plus missing transverse momentum) to reconstruct the $\\Delta^\\pm$ invariant mass. The significance formula of Eq. (4.4), with a conservatively assumed 20% background systematic, converts the simulated fiducial cross sections into the quoted discovery luminosities.","core_discovery":"The central discovery claim is that, for $m_{\\Delta^\\pm}\\approx150$ GeV, electroweak pair production $e^+e^-\\to \\gamma^*,Z^*\\to \\Delta^+\\Delta^-$ at $\\sqrt{s}=350$ GeV yields observable final states through the dominant decays $\\Delta^\\pm\\to W^\\pm Z$, $\\tau^\\pm\\nu$, and $tb$. Using three signal regions—SR1 ($\\ge3j+1\\ell$, DNN-enhanced), SR2 ($\\ge3\\ell+\\tau_{\\mathrm{had}}$, DNN-enhanced), and SR3 ($\\ge4j+\\tau_{\\mathrm{had}}$, cut-based)—the paper finds a $5\\sigma$ significance with less than $1\\text{ fb}^{-1}$ in SR1, a $5\\sigma$ reach at $500\\text{ fb}^{-1}$ in SR2, and, from the reconstructed invariant mass distribution in SR3, a statistical mass uncertainty of $\\approx750$ MeV at $500\\text{ fb}^{-1}$. The net claim is that a 350 GeV lepton collider can discover the charged Higgs and pin down its mass with $\\mathcal{O}(1)$ GeV accuracy, something the LHC cannot currently do.","pith_inferences":["If the 152 GeV excesses are indeed the neutral component of the triplet, the charged partner should be visible in SR1 within the first 1 fb^-1; a null result there would count against the $\\Delta$SM interpretation of those excesses.","Because the SR3 measurement is statistics-dominated at 750 MeV while the jet-energy-scale systematic is about 150 MeV, the quoted $\\mathcal{O}(1)$ GeV mass accuracy is likely to persist, but not improve much, as more luminosity is accumulated.","The same DNN-plus-signal-region strategy could be reused, once a signal is established, to measure $\\Delta^\\pm$ branching ratios, a step the paper explicitly leaves for future work.","Running at a centre-of-mass energy of 500 GeV, where the production cross section is smaller (see Fig. 2), would offer an independent consistency check of the Drell-Yan production mechanism and help separate production from decay kinematics."],"forward_implications":["A future $e^+e^-$ collider at $\\sqrt{s}=350$ GeV can discover the $\\Delta^\\pm$ with less than $1\\text{ fb}^{-1}$ in SR1, making the charged scalar one of the first new-physics targets for such a machine.","SR3 provides a direct mass measurement of $\\Delta^\\pm$ with $\\mathcal{O}(1)$ GeV accuracy, which would sharpen the connection to the observed 152 GeV resonance and test the quasi-degenerate mass spectrum of the $\\Delta$SM.","The three signal regions offer complementary handles: SR1 for fast discovery, SR2 for a clean cross-check with small systematic uncertainties, and SR3 for kinematical reconstruction.","Because the production is via $\\gamma^*/Z^*$, the analysis relies on electroweak couplings rather than the triplet vacuum expectation value, so it remains sensitive even for small $v_\\Delta$, where vector-boson fusion at the LHC is suppressed.","The method generalises to other electroweak-scale masses, as the authors note, so the same strategy can map the charged-scalar discovery reach beyond the 150 GeV benchmark."],"supporting_citations":[{"why":"Supplies the decay widths, production cross sections and LHC constraints used to motivate the $\\Delta^\\pm$ search.","marker":"[46]"},{"why":"Ties the benchmark mass to the diphoton, Zgamma and WW excesses that motivate the model.","marker":"[44]"},{"why":"Provides the 152±1 GeV excess that fixes the $\\Delta^\\pm$ benchmark mass.","marker":"[35]"},{"why":"Defines the detector configuration and beam conditions assumed in the Delphes simulation.","marker":"[54]"},{"why":"Simulates detector response for jets, leptons, taus and missing energy.","marker":"[79]"},{"why":"Performs parton shower and hadronisation for signal and background events.","marker":"[78]"},{"why":"Defines the jet reconstruction used in all signal regions.","marker":"[80]"},{"why":"Provides the significance formula in Eq. (4.4) used to compute discovery luminosities.","marker":"[85]"},{"why":"Supplies the branching-ratio uncertainties propagated into the decay predictions for $\\Delta^\\pm$.","marker":"[75]"}],"fun_headline_variants":["150 GeV charged Higgs visible at e+e- with <1 fb^-1","Charged Higgs mass pinned to ~1 GeV with 500 fb^-1 at e+e-","Under 1 fb^-1 for 5σ charged Higgs at future e+e-","e+e- collider: 150 GeV charged Higgs discovery in <1 fb^-1","5σ charged Higgs at e+e- with less than 1 fb^-1"],"cache_read_input_tokens":3200,"weakest_assumption_plain":"The projections assume that after the preselections only the simulated Standard Model backgrounds matter—tri-boson events for SR1, vector-boson-plus-tau events for SR2, and a single aggregate background for SR3—and that a 20% background systematic covers reconstruction uncertainties; if additional backgrounds such as WW/WZ/ZZ or multi-jet events leak into SR3, the 5σ luminosity and the 750 MeV mass accuracy would be overestimated.","fun_headline_variants_meta":{"raw":{"variants":["150 GeV charged Higgs visible at e+e- with <1 fb^-1","Charged Higgs mass pinned to ~1 GeV with 500 fb^-1 at e+e-","Under 1 fb^-1 for 5σ charged Higgs at future e+e-","e+e- collider: 150 GeV charged Higgs discovery in <1 fb^-1","5σ charged Higgs at e+e- with less than 1 fb^-1"]},"model":"deepseek-v4-flash","effort":"low","cost_usd":0.0015,"raw_usage":{"total_tokens":6129,"prompt_tokens":1169,"completion_tokens":4960,"prompt_tokens_details":{"cached_tokens":384},"prompt_cache_hit_tokens":384,"prompt_cache_miss_tokens":785,"completion_tokens_details":{"reasoning_tokens":4848}},"tokens_in":785,"tokens_out":4960,"duration_ms":27904,"temperature":1.0,"reasoning_tokens":4848,"cache_read_input_tokens":384,"cache_creation_input_tokens":0},"cache_creation_input_tokens":0},"created_at":"2026-08-15T15:51:40.598978+00:00","model_set":{"reader":"deepseek-v4-flash"},"falsifier":"Run the SR1 selection on 1 $fb^{-1}$ of 350 GeV e+e- data and observe no excess: the claimed 5σ discovery would fail. Equally, a complete simulation of SM backgrounds for SR3 (including WW/WZ/ZZ, triboson, ttbar, and multi-jet production) that yields a post-cut background above the 0.41 fb used in Table 7 would invalidate the 17 $fb^{-1}$ discovery projection and the ≈750 MeV mass error.","supporting_citations":[],"review_version":2}