{"id":"15a65f6d-634c-44c6-80fe-a93716febc63","arxiv_id":"1908.09405","paper_version":1,"verdict":"CONDITIONAL","confidence":"MODERATE","novelty_score":3.0,"correctness_risk":"medium","formal_verification":"none","parameter_count":4,"one_line_summary":"Charged Higgs bosons in the 2HDM Type-III model could be detected at the LHeC with up to about 4 sigma significance at 100 fb^-1 and higher at larger luminosities for masses near 110 to 130 GeV.","lead":"Scientists simulated how a future electron-proton collider, the LHeC, could detect a charged Higgs boson predicted by an extension of the Standard Model. For light masses, the signal should stand out above backgrounds after suitable cuts, making detection feasible.","discovery_kind":"incremental","skeptic_critique":{"model":"deepseek-v4-flash","headline":"Benchmark points inherited from [8] carry the full weight of the feasibility claim; if those points violate current flavor or EW constraints the computed significances do not apply.","rationale":"The reader's weakest_assumption identifies the same load-bearing concern: the benchmark points are not validated in this paper and are inherited from the authors' earlier work. The entire quantitative case rests on those four BPs, so if they are excluded the computed significances do not apply. This is compounded by an internal inconsistency in Table 3 (Y-110 event count increases under Cut III), which shows the numbers cannot be taken entirely at face value. The paper's methodology is otherwise standard — CalcHEP, PYTHIA6, PGS, and MadAnalysis are all established tools — and the qualitative conclusion is plausible for an allowed parameter point. I therefore do not see grounds for rejection, but the verdict should remain CONDITIONAL, requiring validation of the benchmark points, correction of Table 3, and ideally a systematic uncertainty estimate. My agreement with the reader is 'agree' because we identify the same primary weakness.","tokens_in":7755,"tokens_out":1510,"duration_ms":17675,"concrete_test":"Independently recompute the Y-110 row of Table 3 with the stated cuts (I–IV) using the same CalcHEP/PYTHIA/PGS chain; if the Cut II→III event count does not increase, trace and correct the bookkeeping. Separately, test each of the four BPs against current flavor constraints (b→sγ, Bs→μμ, B→τν, R(D(*))) and LHC charged-Higgs searches using a public tool such as SuperIso or HiggsBounds; if any BP is excluded, recompute the LHeC significances with an allowed BP to see whether the feasibility conclusion survives.","verdict_should_be":"CONDITIONAL","load_bearing_attack":"The central claim — that light charged Higgs detection at the LHeC is feasible in the 2HDM-III — is established only for four benchmark points (BPs) taken verbatim from the same authors' prior work [8]. The paper states the χ parameters and coupling hierarchies but gives no derivation, no validation against current flavor, electroweak, or collider constraints, and no variation around the chosen points. If any BP is excluded (e.g., by b→sγ, Bs→μμ, B→τν, or LHC direct H± searches), or if the four-zero texture is not realized, the S/√B values in Tables 3 and 4 and the 'excellent prospects' conclusion lose their basis. The significance numbers also carry no systematic uncertainty: a single PDF set (CTEQ6L1), a single detector emulator (PGS), and one set of cuts are used, with no cut-variation or PDF-error estimate. In addition, Table 3 shows a monotonicity inconsistency in the Y-110 row: 468 events after Cut II but 567 after Cut III, so the reported event counts are not internally reliable. The feasibility claim is therefore contingent on an unvalidated parameter input, and the numerical support is partially inconsistent, although the overall simulation methodology is standard and the qualitative conclusion is plausible for an allowed parameter point.","agreement_with_reader":"agree"},"referee_report":{"model":"deepseek-v4-flash","summary":"This paper investigates the observability of a light charged Higgs boson H− at the proposed LHeC e−p collider within the 2HDM type III with a four-zero Yukawa texture. The charged-current process e−p → ν_e q H− is simulated with CalcHEP, PYTHIA6 and PGS, and the H−→b\\bar c and H−→τ\\bar ν_τ decay channels are analysed after four sequential cuts. Four benchmark points (2HDM-III like-I, II, X, Y) are adopted from the authors' earlier work, with mH±=110–170 GeV. The central result is that at mH±=110 GeV and L=100 fb^-1, the significance S/√B ranges from 1.4 to 4.2 depending on the benchmark, leading to the conclusion that the detection prospects are 'excellent'.","tokens_in":8030,"tokens_out":7127,"duration_ms":64491,"significance":"If the quoted significances are correct, the paper provides a useful demonstration that the LHeC could extend the charged-Higgs search reach to light masses in the 2HDM-III, complementing LHC searches. The strengths are the detailed description of the Monte Carlo chain and cut flow, and the inclusion of a large set of reducible and irreducible backgrounds. The study is, however, only as good as its input benchmark points and its event bookkeeping; both currently raise concerns.","major_comments":[{"comment":"The reported event counts after sequential cuts in Table 3 are internally inconsistent. In the Y-110 row the number of signal events rises from 468 after Cut II to 567 after Cut III, although Cut III imposes |η|>0.6 on the forward jet and can only reduce the sample. In addition, the significances in the final column do not match S_after_CutIV / √B with the quoted B=1441: for I-130, 19/37.9=0.50 is reported as 0.58; for I-150, 3/37.9=0.08 is reported as 0.16; similar discrepancies occur for II-130, II-150, Y-130 and Y-150. Since these significances are the central quantitative result, please re-check the event counts, state precisely how the significance is computed (e.g., S after Cut IV divided by √B where B is the sum of background event counts after Cut IV), and correct Table 3 and the corresponding text.","section":"Table 3"},{"comment":"The four benchmark points are taken verbatim from Ref. [8] and are not derived or validated in this paper. The cross sections and branching ratios in Table 2, and hence all S/√B values, depend directly on the χ parameters. The text says that the points account for 'the most recent constraints from experimental data [8]' but no constraints are listed. Please add a short paragraph stating which flavour, electroweak and direct collider constraints have been applied (e.g., b→sγ, B_s→μμ, B→τν, LHC H± searches) and explicitly confirming that each benchmark point satisfies them. This is necessary for the reader to judge whether the quoted significance estimates apply.","section":"Section 2"},{"comment":"The analysis uses a single PDF set (CTEQ6L1), one detector emulator setting and one set of cuts, and the quoted significances are point estimates with no systematic uncertainty. Since the significances at 100 fb^-1 are O(1)–4, PDF and scale uncertainties of typically 10–20% could change the conclusions (e.g., a 3σ evidence claim could become 2σ). Please estimate the impact of PDF uncertainties (e.g., by comparing with another PDF set) and of renormalization/factorization scale variation, or state explicitly that the quoted values are statistical only and discuss the sensitivity of the conclusion.","section":"Section 3"}],"minor_comments":[{"comment":"Reference [7] contains a garbled author name 'J. Hernández-S#anchez' due to an encoding error; please fix.","section":"References"},{"comment":"The phrase 'taking in account' in the abstract should be 'taking into account'.","section":"Abstract"},{"comment":"There are several typos, e.g., 'V akum Expectation V alues' in Section 2 and '(pseu do)scalars' in the caption of Figure 2.","section":"Section 2 and Figure 2"},{"comment":"The meaning of the columns 'X Y Z' in Table 2 is not explained in the caption; please clarify that these are the parameters of Eqs. (2.4)–(2.6).","section":"Table 2"}],"recommendation":"major_revision","confidential_remarks":"The paper is heavily self-referential: the benchmark points are taken verbatim from the authors' own Ref. [8]. In principle this is acceptable for a proceedings contribution, but combined with the numerical inconsistencies in Table 3, I would not accept the current version. Please request a corrected table and a statement of the applied constraints."},"author_rebuttal":null,"desk_editor":{"model":"deepseek-v4-flash","letter":"This is a short proceedings write-up that recaps the authors' PRD article [8] on light charged Higgs production at the LHeC. If you already know [8], there is nothing new here: same model, same four benchmark points, same simulation chain, same conclusions. The only refresh is the explicit cut tables and significance numbers for the specific LHeC energy and luminosity assumptions.\n\nWhat the paper does well is mostly procedural. The simulation chain is standard (CalcHEP + PYTHIA + PGS + MadAnalysis), the background list is reasonably complete for both the b-cbar and tau-nu channels, and the cut flow is described clearly enough to reproduce. For the stated benchmark points, the claim that a 110 GeV charged Higgs in 2HDM-III would be visible at the LHeC with S/sqrt(B) around 1.4 to 4.2 at 100 fb^-1 is plausible, and the scaling to 1000 and 3000 fb^-1 is straightforward.\n\nThe soft spots are real but not all equal. The biggest one is that the benchmark points are imported verbatim from the authors' own previous papers, with no validation against current flavor, electroweak, or direct collider constraints. The paper says these points offer the 'most optimistic chances for detection' and cites [8] for that, but it does not show that those points are still allowed. The feasibility claim is therefore conditional on an external input that the reader cannot check from this text. That is a serious limitation for a standalone paper, though it becomes less serious if the paper is explicitly meant as an executive summary of [8].\n\nThere is also a clear internal inconsistency in Table 3: for the Y-110 row, the event count goes from 468 after Cut I to 567 after Cut II. Cuts are supposed to remove events, not add them. That is probably a typo or the columns are misaligned for that row, but it makes the exact numbers in that table unreliable until corrected. The paper also quotes no systematic uncertainties: one PDF set, one detector emulator, and no cut variation. For a feasibility estimate that is arguably acceptable, but it should be stated rather than implied.\n\nThe citation pattern is self-referential in the sense that the model and benchmarks come from the same group, but that is not itself a flaw when the earlier papers are the actual source of the input. It does mean this paper cannot stand alone as a derivation.\n\nWho is this for? Someone who wants a two-page summary of the PRD result for a conference report. It is not a paper that advances the subject, and the Table 3 issue means I would not use the numbers without checking against [8]. For peer review, I would not send this version to a serious referee: it is an incremental conference summary of already published work with an unresolved numerical inconsistency. If the authors fix the table and explicitly state that the benchmarks come from [8], it is acceptable as a proceedings contribution, but the citable result remains the PRD.","headline":"A clean conference recap of the authors' PRD study, but it brings no new results and its Table 3 has an internal inconsistency that should be fixed before the numbers are used.","tokens_in":8591,"tokens_out":2339,"would_cite":false,"duration_ms":26695,"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":"A light charged Higgs boson could be detectable at the proposed LHeC electron-proton collider, this simulation study argues.","keywords":["charged Higgs boson","LHeC","2HDM Type-III","four-zero texture","ep collisions","Higgs decays","signal significance","b cbar channel"],"falsifier":"Compute the four benchmark points of Section 2 against the current measured values of flavor observables such as $B\\to X_s\\gamma$ and $B_s\\to\\mu^+\\mu^-$ and the measured 125 GeV Higgs signal rates; exclusion of any benchmark, or a null result from an LHeC run at $100~\\mathrm{fb}^{-1}$ with $m_{H^\\pm}=110$ GeV, would falsify the paper's feasibility claim.","tokens_in":7569,"feed_emoji":"⚛️","tokens_out":6245,"duration_ms":62062,"temperature":0.7,"pith_summary":"This paper argues that a light charged Higgs boson $H^-$, predicted in two-Higgs-doublet extensions of the Standard Model, can be discovered at the proposed Large Hadron electron Collider (LHeC). It studies the charged-current process $e^- p \\to \\nu_e q H^-$ with $H^-$ decaying to $b\\bar{c}$ or to $\\tau \\bar{\\nu}_\\tau$, in the Type-III two-Higgs-doublet model with a four-zero texture that suppresses flavor-changing neutral currents. After a cut-based selection, simulated signal significances $S/\\sqrt{B}$ reach 1.4–4.2 at $100~\\mathrm{fb}^{-1}$ for $m_{H^\\pm}=110$ GeV, with the $b\\bar{c}$ channel strongest in the like-I, -II and -Y incarnations and the $\\tau$ channel in the like-X case. If correct, the LHeC would complement hadron-collider searches by covering light charged-Higgs masses that are difficult to probe elsewhere.","feed_headline":"Light charged Higgs bosons would show up at the LHeC","feed_subtitle":"Simulated e-p collisions give a signal up to 4.2 sigma over background for a 110 GeV charged Higgs.","key_machinery":"The machinery is the four-zero texture imposed on the Hermitian Yukawa matrices $Y_1$ and $Y_2$, which after electroweak symmetry breaking gives fermion couplings of the form $[\\tilde{Y}^f_n]_{ij}=(\\sqrt{m_i m_j}/v)[\\chi^f_n]_{ij} e^{i\\theta}$. This texture keeps flavor-changing neutral currents under control while allowing both Higgs doublets to couple to both up- and down-type quarks. From it come the charged-Higgs couplings $X_{ij}$, $Y_{ij}$, $Z_{ij}$ that determine the production cross section and branching ratios, and a general two-doublet scalar potential supplies the Higgs spectrum. The rest of the argument is a cut flow: selection of three jets with b-tagging, a forward jet, and an invariant-mass window around $m_{H^\\pm}$ for the $b\\bar{c}$ channel, or one b-jet plus a lepton and a transverse-mass window for the $\\tau$ channel.","core_discovery":"The central claim is that detecting a light charged Higgs boson at the LHeC is feasible in the 2HDM-III. Specifically, the paper shows that for four benchmark points drawn from the same authors' prior study, the process $e^-p\\to\\nu_e q H^-$ followed by $H^-\\to b\\bar{c}$ and $H^-\\to\\tau\\bar{\\nu}_\\tau$ survives a sequence of detector-level cuts, yielding $S/\\sqrt{B}=1.43$, $1.40$, $2.41$ and $4.18$ at $100~\\mathrm{fb}^{-1}$ for $m_{H^\\pm}=110$ GeV in the like-I, -II, -X and -Y incarnations, respectively. The strongest $b\\bar{c}$ signal comes from the like-Y benchmark, while the $\\tau\\bar{\\nu}_\\tau$ signal is strongest in the like-X case. At integrated luminosities of 1000 and 3000 $\\mathrm{fb}^{-1}$, the significances grow to roughly 4.5–13 and 7.8–22.5 for the best channels. The paper concludes that the LHeC's standard energy ($\\sqrt{s}\\approx1.3$ TeV) and luminosity assumptions are sufficient for these prospects.","pith_inferences":["The quoted reach extends with luminosity: at $3000~\\mathrm{fb}^{-1}$, the same cut flow should probe charged Higgs masses beyond 110 GeV, since the 130 GeV benchmarks already give $S/\\sqrt{B}$ in the 3.2–7.8 range.","The conclusion depends on the four chosen benchmark points, not on a scan of the parameter space; mapping the full allowed $\\chi$ region would show whether the 110 GeV detectability is generic or confined to those points.","The same event-selection strategy could be adapted to other charged-Higgs decay modes—for instance $H^-\\to c\\bar{s}$ or $H^-\\to t\\bar{b}$—and to other two-Higgs-doublet realizations, potentially widening the LHeC's charged-Higgs reach."],"forward_implications":["At the LHeC with $\\sqrt{s}\\approx1.3$ TeV and $100~\\mathrm{fb}^{-1}$, a 110 GeV charged Higgs in the 2HDM-III would be visible with $S/\\sqrt{B}$ between 1.4 and 4.2, and the significance grows with integrated luminosity.","The $H^-\\to b\\bar{c}$ channel works best in the 2HDM-III like-I, -II and -Y incarnations, while $H^-\\to\\tau\\bar{\\nu}_\\tau$ is the discovery channel in the like-X incarnation.","For heavier masses, the prospects degrade sharply: at $m_{H^\\pm}=150$ GeV the significances fall below about 0.3 at $100~\\mathrm{fb}^{-1}$ in most scenarios, so the LHeC coverage is concentrated on light charged Higgs states.","A modest set of sequential cuts—jet multiplicity, b-tagging, forward-jet selection, and mass-window reconstruction—is enough to suppress both reducible and irreducible backgrounds.","The analysis supports the view that an $ep$ collider can act as a charged-Higgs discovery machine in a mass range where hadron-collider searches face large backgrounds."],"supporting_citations":[{"why":"Supplies the four benchmark points and the earlier feasibility study on which the present significances rest.","marker":"[8]"},{"why":"Derives the charged-Higgs couplings $X_{ij}$, $Y_{ij}$, $Z_{ij}$ and constrains the $\\chi$ parameters through flavor physics.","marker":"[5]"},{"why":"Introduces the 2HDM-III charged-Higgs couplings and the $b\\bar{c}$ decay analysis that this paper extends.","marker":"[4]"},{"why":"Establishes the four-zero texture realization of the Yukawa matrices used to control flavor-changing neutral currents.","marker":"[10]"},{"why":"Defines the LHeC accelerator and detector assumptions, including energy, luminosity, and calorimeter parameters.","marker":"[15]"},{"why":"Provides the LHeC design reference used for the detector simulation settings.","marker":"[16]"},{"why":"Is the parton-level event generator used to produce the simulated signal and background samples.","marker":"[11]"}],"fun_headline_variants":["LHeC could spot a light charged Higgs","Charged Higgs signal up to 4.2 sigma at LHeC","Light charged Higgs within LHeC's reach","Future ep collider: light charged Higgs observable"],"cache_read_input_tokens":3200,"weakest_assumption_plain":"The quoted significances rely on benchmark parameter points taken from the authors' previous study without re-testing them against current flavor and collider constraints; if those points are excluded, or if the LHeC does not deliver the assumed $\\sqrt{s}\\approx1.3$ TeV and $100$ to $3000~\\mathrm{fb}^{-1}$, the detection claim does not stand.","fun_headline_variants_meta":{"raw":{"variants":["LHeC could spot a light charged Higgs","Charged Higgs signal up to 4.2 sigma at LHeC","Light charged Higgs within LHeC's reach","Future ep collider: light charged Higgs observable"]},"model":"deepseek-v4-flash","effort":"low","cost_usd":0.000191,"raw_usage":{"total_tokens":1348,"prompt_tokens":958,"completion_tokens":390,"prompt_tokens_details":{"cached_tokens":384},"prompt_cache_hit_tokens":384,"prompt_cache_miss_tokens":574,"completion_tokens_details":{"reasoning_tokens":324}},"tokens_in":574,"tokens_out":390,"duration_ms":4179,"temperature":1.0,"reasoning_tokens":324,"cache_read_input_tokens":384,"cache_creation_input_tokens":0},"cache_creation_input_tokens":0},"created_at":"2026-08-14T11:12:13.024626+00:00","model_set":{"reader":"deepseek-v4-flash"},"falsifier":"Compute the four benchmark points of Section 2 against the current measured values of flavor observables such as $B\\to X_s\\gamma$ and $B_s\\to\\mu^+\\mu^-$ and the measured 125 GeV Higgs signal rates; exclusion of any benchmark, or a null result from an LHeC run at $100~\\mathrm{fb}^{-1}$ with $m_{H^\\pm}=110$ GeV, would falsify the paper's feasibility claim.","supporting_citations":[{"cited_title":"Light charged Higgs boson production at the Large Hadron electron Collider","cited_arxiv_id":"1811.05476","evidence_quote":"Supplies the four benchmark points and the earlier feasibility study on which the present significances rest."},{"cited_title":"Yukawa txtures and charged Higgs boson phenomenology in the type-III two-Higgs-doublet model","cited_arxiv_id":"0902.4490","evidence_quote":"Introduces the 2HDM-III charged-Higgs couplings and the $b\\bar{c}$ decay analysis that this paper extends."},{"cited_title":"Analysis of the quark sector in the 2HDM-III with a four-zero Yukawa texture using the most recent data on the CKM matrix","cited_arxiv_id":"1311.5210","evidence_quote":"Establishes the four-zero texture realization of the Yukawa matrices used to control flavor-changing neutral currents."},{"cited_title":"The Large Hadron Electron Collider","cited_arxiv_id":"1305.2090","evidence_quote":"Provides the LHeC design reference used for the detector simulation settings."}],"review_version":1}