{"id":"7015a0fb-3294-4ad7-a545-c64948ee66a4","arxiv_id":"2501.09914","paper_version":2,"verdict":"CONDITIONAL","confidence":"MODERATE","novelty_score":5.0,"correctness_risk":"medium","formal_verification":"none","parameter_count":2,"one_line_summary":"Kaon-proton scattering is predicted to create visible bumps from the molecular pentaquark states Pψs(4338) and Pψs(4459), with peak visibility depending strongly on the fitted cutoff.","lead":"This paper predicts how often exotic particles called strange hidden-charm pentaquarks would be made when a kaon beam hits a proton. The calculations give experiments at J-PARC and JLab specific patterns to look for in several particle final states.","discovery_kind":"new_application","skeptic_critique":{"model":"deepseek-v4-flash","headline":"Omitted open inelastic channels are asserted to only rescale cross sections, but at 4.3-4.5 GeV the K^-p system is dominated by them; the pole/background interference that defines the predicted peaks is exactly what such energy-dependent phases can destroy.","rationale":"The reader's weakest assumption is exactly the treatment of omitted inelastic channels, and the reader also flags cutoff sensitivity. My independent reading agrees: the central claim is that kaon-induced cross sections will show recognizable structures mapping to P_psi_s(4338) and P_psi_s(4459), and the paper's own results show that these structures are fragile under parameter variation. The most load-bearing premise is the Sec. 2.1 assertion that unmodeled channels only change magnitudes. This premise is especially questionable because the initial K^-p channel at these energies has a huge inelasticity from light hadronic channels, and the qBSE is a coupled-channel framework whose unitarity is truncated. The internal evidence of peaks vanishing or flipping to dips at the preferred cutoff reinforces that the predictions are sensitive to precisely the kind of energy-dependent interference that omitted channels can modify. I therefore do not change the reader's CONDITIONAL verdict, but the condition should be made explicit: before these cross sections are used as an experimental guide, the authors should either include the dominant open inelastic channels or demonstrate numerically that their omission does not alter the predicted structures.","tokens_in":19806,"tokens_out":7409,"duration_ms":82682,"concrete_test":"Extend the qBSE to include the dominant open two-body channels of K^-p in this energy region (pi-Lambda, pi-Sigma, K-Xi, eta-Lambda, and optionally pi-Sigma*) with a standard meson-exchange kernel constrained by K^-p total and elastic cross sections, then recompute the 1/2^- and 3/2^- partial-wave cross sections in the Xi'_c Dbar, Xi_c Dbar, and Lambda_c Dbar_s channels at Lambda = 1.04, 1.14, and 1.24 GeV. If the peak positions or heights change by more than about 20 MeV or a factor of about 2 relative to the truncated calculation, or if any predicted peak becomes a dip, the central observability claim is not supported; if the line shapes are stable, the concern is refuted.","verdict_should_be":"UNCHANGED","load_bearing_attack":"Sec. 2.1 asserts that omitted inelastic channels 'primarily influence cross-section magnitudes rather than the fundamental production mechanisms' and that line-shape features are insensitive to them 'due to the large mass gap.' This is the load-bearing premise for using the truncated coupled-channel qBSE to predict observable peaks, and it is not demonstrated. Around W = 4.3-4.5 GeV the initial K^-p system is far above the thresholds for pi-Lambda, pi-Sigma, K-Xi, eta-Lambda, and many other open channels; these channels carry most of the initial-state inelasticity. Because the qBSE is a unitary coupled-channel equation, dropping them removes the dominant absorptive parts of the KbarN self-energy and the energy-dependent phases that feed the production amplitude. The paper itself shows how delicate the signal is: the 1/2^- peak in the Xi'_c Dbar channel associated with P_psi_s(4459) is 'nearly unobservable' at the preferred cutoff Lambda = 1.04 GeV and only becomes a clear nb-level peak at 1.24 GeV (Sec. 3.2, Fig. 2), while nearby structures flip between peaks and dips as the cutoff varies. A change in the complex phase of the background from omitted channels can therefore shift, suppress, or invert the predicted structures, not merely rescale them. Since the stated goal is to guide experimental searches, this assertion is not a harmless normalization issue and must be checked numerically.","agreement_with_reader":"agree"},"referee_report":{"model":"deepseek-v4-flash","summary":"The manuscript investigates kaon-induced production of strange hidden-charm molecular pentaquarks by computing K^- p scattering into charmed-strange final states. The authors construct one-boson-exchange potentials from effective Lagrangians and solve a quasipotential Bethe-Salpeter equation for the coupled channels KbarN, Xi_c^(*) Dbar^(*), Xi'_c Dbar^(*), Lambda_c Dbar_s^(*), and Lambda J/psi. They locate molecular poles in the complex energy plane and predict partial-wave cross sections for J^P = 1/2^- and 3/2^-, claiming that structures in the Lambda_c Dbar_s and Xi'_c Dbar channels correspond to P_psi_s(4338) and P_psi_s(4459), with additional poles near the Xi_c^* Dbar and Xi'_c Dbar thresholds. The predictions are presented as order-of-magnitude estimates, with explicit variation of the cutoff Lambda = 1.04, 1.14, and 1.24 GeV.","tokens_in":20182,"tokens_out":6990,"duration_ms":73063,"significance":"The work provides genuinely new, falsifiable predictions for kaon-beam experiments at J-PARC and JLab, extending the molecular interpretation of the LHCb states to a production reaction. It is a strength that the cutoff is inherited from a previous fit to LHCb data rather than refitted to the new cross sections, and that the authors explicitly show how the results depend on the cutoff. The main value is as a guide for future experimental searches. However, the robustness of the central peak assignments is not established: the signals are interference structures that depend on subtle coupled-channel phases and on the cutoff, and the treatment of omitted inelastic channels is an unvalidated assumption. With those caveats addressed, the paper would be a useful phenomenological contribution.","major_comments":[{"comment":"The assertion that omitted inelastic channels such as pi-Lambda, pi-Sigma, K-Xi, eta-Lambda, and multi-meson states \"primarily influence cross-section magnitudes rather than the fundamental production mechanisms\" is load-bearing but not demonstrated. At W = 4.3-4.5 GeV the initial KbarN system is far above the thresholds of these channels, and in a unitary coupled-channel treatment they contribute the dominant absorptive parts and energy-dependent phases that feed the production amplitude. Since the predicted peaks are pole-background interference effects in Eq. (10), a change in the complex phase of the background from omitted channels can shift, suppress, or invert the structures, not merely rescale them. The near-vanishing of the 1/2^- peak in the Xi'_c Dbar channel at the preferred cutoff (Fig. 2) makes this sensitivity concrete. Please provide a numerical test, for example by including one or more representative inelastic channels, or substantially weaken the claim.","section":"Sec. 2.1"},{"comment":"The abstract's claim that both molecular states near the Xi_c Dbar^* threshold with J^P = 1/2^- and 3/2^- \"produce peaks in the Xi'_c Dbar channel\" is not accurate at the preferred cutoff Lambda = 1.04 GeV: the text states that the 1/2^- peak is \"nearly unobservable\" there and only becomes a clear nb-level peak at 1.24 GeV. The central prediction should be stated at the preferred parameter point with its uncertainty quantified, and the abstract should be adjusted accordingly; otherwise the paper overstates the robustness of its headline signal.","section":"Sec. 3.2, Fig. 2"},{"comment":"For J^P = 3/2^-, the structure associated with P_psi_s(4459) appears as a peak in the Xi'_c Dbar channel at Lambda = 1.04 GeV, disappears at 1.14 GeV, and reappears in the Xi_c Dbar channel at 1.24 GeV, while also generating a small dip in Lambda_c Dbar_s. Because the predicted observable changes from peak to dip to a peak in a different channel across the adopted cutoff range, the association with the LHCb state is not robust unless the authors provide a criterion for selecting the physical cutoff or identify a feature that is stable over the entire range.","section":"Sec. 3.3, Fig. 3"},{"comment":"The \"swing structure\" in the Lambda_c Dbar_s cross section near 4340 MeV is attributed to the pole corresponding to P_psi_s(4338) interfering with background, but the same energy region contains the Xi_c Dbar threshold. A calculation with the pole artificially removed, or with the pole coupling strength set to zero, would demonstrate that the structure is actually resonance-driven rather than a threshold cusp. This is needed to support the abstract's claim of a structure \"corresponding to P_psi_s(4338)\".","section":"Sec. 3.4, Fig. 4"}],"minor_comments":[{"comment":"The Introduction mentions \"P_psi_s(4438)\" where P_psi_s(4338) is evidently intended; please correct this typo.","section":"Sec. 1"},{"comment":"The quantities with tildes, \\tilde{J}, \\tilde{j}_1, and \\tilde{j}_2, are not defined below the cross-section formula; please specify whether they denote the usual (2J+1) and (2j_i+1) factors.","section":"Eq. (15)"},{"comment":"The phrase \"The colorboxe represent\" should read \"The color boxes represent\".","section":"Sec. 3.1"},{"comment":"The mass of the broad sigma meson is taken as 500 MeV without discussion of its influence; since sigma exchange contributes substantially to the potentials, a brief comment on this model parameter and its uncertainty would be helpful.","section":"Sec. 2.1"},{"comment":"The statement that the Lambda J/psi cross section is consistent with Refs. [56-59] would benefit from a caveat that those calculations employ different production mechanisms and parameter choices, so the comparison is only qualitative.","section":"Sec. 3.2"},{"comment":"The paper states that no data are associated with it; given that the main results are cross-section curves, a small supplementary table with representative numerical values for the key channels would improve reproducibility.","section":"Data Availability Statement"}],"recommendation":"major_revision","confidential_remarks":"The paper fits the journal's scope and the central idea is worth pursuing, but the robustness of the predicted peaks needs to be demonstrated before the claims can be accepted. The main concern is not circularity or parameter fitting; it is the missing numerical control of omitted inelastic channels and the strong cutoff sensitivity of the headline signals. No concerns about novelty or citation practices."},"author_rebuttal":null,"desk_editor":{"model":"deepseek-v4-flash","letter":"Short version: this is a legitimate, internally coherent extension of the authors' established qBSE molecular framework, and it does something new — it adds the ¯KN channel explicitly and predicts partial-wave cross sections for ¯K p into several charmed final states. The catch is that the headline peaks are delicate, and the paper's justification for truncating the coupled-channel space is asserted rather than shown.\n\nWhat's new and useful: earlier kaon-induced studies used effective Lagrangians or Regge models for ¯K p → J/ψΛ. This paper computes the coupled-channel amplitude within the same one-boson-exchange qBSE scheme the authors used to fit the LHCb spectra, and produces cross sections for Λ_c D_s^(∗), Ξ_c D̄, Ξ'_c D̄ as well as ΛJ/ψ. That is a genuine extension, and the ΛJ/ψ result (~1 nb) agrees with existing literature. Credit where due: the paper is transparent about cutoff dependence, shows results at three cutoffs, and openly reports that the 1/2^- peak in Ξ'_c D̄ nearly vanishes at the preferred Λ = 1.04 GeV. The stated aim is order-of-magnitude predictions, which is honest.\n\nSoft spots, in proportion: the load-bearing premise is in Sec. 2.1 — the omitted inelastic channels (πΛ, πΣ, KΞ, ηΛ, ...) 'primarily influence cross-section magnitudes rather than the fundamental production mechanisms.' Around W = 4.3–4.5 GeV those channels carry most of the ¯KN inelasticity. The qBSE is a unitary coupled-channel equation; dropping the dominant absorptive parts removes energy-dependent phases that feed the production amplitude. The predicted structures themselves flip between peak and dip as Λ changes (Ξ_c D̄ at 1.04 vs 1.14 GeV), so the observable peaks are demonstrably sensitive to model choices. That does not make the paper worthless, but the insensitivity claim needs a numerical check — adding a complex ¯KN self-energy or representative inelastic channels — before these cross sections are used as a firm experimental guide. A minor secondary point: the results cannot be reproduced from the text alone; the quadrature grid and discretization details are not given, though this is common for this framework. The cutoff inherited from the previous LHCb fit is not viciously circular; the cross sections are new observables, but the predictions do carry prior tuning.\n\nBottom line: this is for hadron spectroscopists planning J-PARC and JLab kaon-beam searches. It deserves a serious referee — the calculation is substantive and the hypothesis is falsifiable — though the referee should push on the truncation issue. I would send it to review, not desk reject, and ask for the robustness check.","headline":"A legitimate extension of the authors' qBSE molecular framework to kaon-induced production with genuinely new cross-section predictions, but the headline peaks are fragile and the truncation of inelastic channels is asserted, not demonstrated.","tokens_in":20683,"tokens_out":4181,"would_cite":true,"duration_ms":37116,"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":"Kaon beams can expose the strange pentaquark states Pψs(4338) and Pψs(4459).","keywords":["hidden-charm pentaquarks","strange pentaquarks","kaon-induced production","hadronic molecules","coupled-channel Bethe-Salpeter equation","one-boson-exchange model","partial-wave cross sections","Pψs(4338)"],"falsifier":"A kaon-beam measurement of K−p → Λc\\bar{D}s and K−p → Ξ′c\\bar{D} with nanobarn-level sensitivity across the 4250–4550 MeV invariant-mass region would settle it: no swing near the Ξc\\bar{D} threshold in Λc\\bar{D}s and no peak near the Ξc\\bar{D}∗ threshold in Ξ′c\\bar{D} would contradict the central prediction.","tokens_in":1844,"feed_emoji":"⚛️","tokens_out":4401,"duration_ms":82001,"temperature":0.7,"pith_summary":"This paper predicts that kaon-induced scattering on protons can produce the strange hidden-charm pentaquarks Pψs(4338) and Pψs(4459), and that the molecular states should appear as specific structures in particular final states. It builds a nine-channel coupled-channel model with one-boson-exchange potentials in a quasipotential Bethe-Salpeter equation, then computes partial-wave cross sections for the reaction. The predicted signatures include a structure near the Ξc\\bar{D} threshold in the Λc\\bar{D}s channel and peaks in the Ξ′c\\bar{D} channel near the Ξc\\bar{D}∗ threshold. If correct, kaon-beam experiments can confirm these states and help distinguish molecular spin-parity assignments, complementing the decay measurements that first revealed them.","feed_headline":"Kaon beams should expose strange pentaquark peaks","feed_subtitle":"Predicted cross-section structures trace the molecular states behind Pψs(4338) and Pψs(4459).","key_machinery":"The central object is the scattering amplitude obtained from a nine-channel coupled-channel calculation: channels \\bar{K}N, $Ξc^{{(*)}}$\\bar{D}^{(*)}, Ξ′c\\bar{D}^{(*)}, Λc\\bar{D}$s^{{(*)}}$, and ΛJ/ψ interact through one-boson-exchange potentials, and the amplitudes are solved with the quasipotential Bethe-Salpeter equation after partial-wave projection. Poles are located by searching for zeros of |1 − V(z)G(z)| in the complex energy plane, and partial-wave cross sections are computed from the on-shell amplitudes, with a cutoff Λ = 1.04 GeV taken from a previous fit to the observed line shapes and varied by ±0.1 GeV to gauge sensitivity.","core_discovery":"The authors claim that the strange hidden-charm pentaquarks seen in B-meson decays can also be produced in kaon-nucleon scattering, and that their molecular structure leaves identifiable marks in partial-wave cross sections. Solving the coupled-channel quasipotential Bethe-Salpeter equation with one-boson-exchange potentials, they find poles below the Ξc\\bar{D} and Ξc\\bar{D}∗ thresholds; these poles generate a stable swing structure around 4340 MeV in the Λc\\bar{D}s channel for Pψs(4338), and cutoff-dependent peaks in the Ξ′c\\bar{D} channel for the two spin-parity states associated with Pψs(4459). A separate J^P = 3/2^- state near the Ξ∗c\\bar{D} threshold produces a broad peak in the Ξc\\bar{D}∗ channel. The large Λc\\bar{D}s and Λc\\bar{D}∗s cross sections in the 4350–4550 MeV region show no resonance peaks beyond threshold cusps, so the discovery channels are the smaller Ξ′c\\bar{D} and Ξc\\bar{D} cross sections.","pith_inferences":["Beyond the paper, the predicted spin-parity dependence suggests kaon beams could serve as a spin filter: measuring the Ξ′c\\bar{D} peak shape across beam momenta could distinguish the 1/2^- and 3/2^- assignments for Pψs(4459) more directly than the decay data used so far.","The strong cutoff sensitivity of the 1/2^- peak implies that a null result in the Ξ′c\\bar{D} channel at one beam energy would not falsify the molecular interpretation; only a systematic scan of the full 4250–4550 MeV region with nanobarn sensitivity could do that.","A testable extension would be to measure the ratio of the Ξ′c\\bar{D} to Λc\\bar{D}s cross sections, since that ratio is less sensitive to absolute normalization uncertainties than either peak height alone."],"forward_implications":["The Pψs(4338) state should appear as a roughly 5 MeV-wide swing structure around 4340 MeV in the Λc\\bar{D}s partial-wave cross section, stable across the cutoff range studied.","The two Pψs(4459)-associated molecular states, with J^P = 1/2^- and 3/2^-, should both produce peaks in the Ξ′c\\bar{D} channel, though the 1/2^- peak nearly disappears at the preferred cutoff of 1.04 GeV.","A separate J^P = 3/2^- state near the Ξ∗c\\bar{D} threshold produces a broad, cutoff-insensitive peak in the Ξc\\bar{D}∗ channel.","In the higher-energy region from 4350 to 4550 MeV, Λc\\bar{D}s and Λc\\bar{D}∗s channels have large cross sections but no distinct molecular-state peaks, so total-rate measurements alone will not reveal the pentaquarks there.","The ΛJ/ψ final state has a small cross section, at or below about 1 nb, consistent with earlier kaon-reaction estimates."],"supporting_citations":[{"why":"Supplies the cutoff value and model parameters fitted to the observed Pψs(4459) and Pψs(4338) line shapes, which the present predictions inherit.","marker":"[32]"},{"why":"Provides the molecular-state assignments for the Ξc^{(*)}\\bar{D}^{(*)} and Ξ′c\\bar{D}^{(*)} interactions that generate the poles studied here.","marker":"[31]"},{"why":"Supplies the observed mass and width of Pψs(4459) used as the comparison target for the Ξc\\bar{D}∗ poles.","marker":"[30]"},{"why":"Supplies the observed mass and width of Pψs(4338) used as the comparison target for the Ξc\\bar{D} pole.","marker":"[37]"},{"why":"Supplies the method of encoding interaction vertices and propagators directly in code to construct the coupled-channel potentials.","marker":"[81]"},{"why":"Supplies the quasipotential Bethe-Salpeter discretization and propagator regularization used to solve the scattering equation.","marker":"[83]"},{"why":"Supplies the Riemann-sheet prescription used to locate poles in the complex energy plane.","marker":"[87]"}],"fun_headline_variants":["Kaon beams could reveal hidden-charm pentaquark peaks","Strange pentaquarks predicted in kaon-proton scattering","Kaon scattering may expose Pψs molecular states","New kaon beam signatures for strange pentaquarks"],"cache_read_input_tokens":22784,"weakest_assumption_plain":"The load-bearing premise is that the many omitted inelastic channels only change the overall size of the cross sections and do not distort their energy dependence; if they add energy-dependent phases or shift the couplings, the predicted peak positions and shapes in the Ξ′c\\bar{D} and Λc\\bar{D}s channels could move or disappear.","fun_headline_variants_meta":{"raw":{"variants":["Kaon beams could reveal hidden-charm pentaquark peaks","Strange pentaquarks predicted in kaon-proton scattering","Kaon scattering may expose Pψs molecular states","New kaon beam signatures for strange pentaquarks"]},"model":"deepseek-v4-flash","effort":"low","cost_usd":0.00096,"raw_usage":{"total_tokens":4228,"prompt_tokens":1220,"completion_tokens":3008,"prompt_tokens_details":{"cached_tokens":384},"prompt_cache_hit_tokens":384,"prompt_cache_miss_tokens":836,"completion_tokens_details":{"reasoning_tokens":2938}},"tokens_in":836,"tokens_out":3008,"duration_ms":24205,"temperature":1.0,"reasoning_tokens":2938,"cache_read_input_tokens":384,"cache_creation_input_tokens":0},"cache_creation_input_tokens":0},"created_at":"2026-08-10T19:32:26.092034+00:00","model_set":{"reader":"deepseek-v4-flash"},"falsifier":"A kaon-beam measurement of K−p → Λc\\bar{D}s and K−p → Ξ′c\\bar{D} with nanobarn-level sensitivity across the 4250–4550 MeV invariant-mass region would settle it: no swing near the Ξc\\bar{D} threshold in Λc\\bar{D}s and no peak near the Ξc\\bar{D}∗ threshold in Ξ′c\\bar{D} would contradict the central prediction.","supporting_citations":[{"cited_title":"PΛ ψs(4459) and PΛ ψs(4338) as molecular states in J/ψΛ invariant mass spectra,","cited_arxiv_id":null,"evidence_quote":"Supplies the cutoff value and model parameters fitted to the observed Pψs(4459) and Pψs(4338) line shapes, which the present predictions inherit."},{"cited_title":"Pcs(4459) and other possible molecular states fromΞ(∗) c ¯D(∗) andΞ′ c ¯D(∗) interactions,","cited_arxiv_id":null,"evidence_quote":"Provides the molecular-state assignments for the Ξc^{(*)}\\bar{D}^{(*)} and Ξ′c\\bar{D}^{(*)} interactions that generate the poles studied here."},{"cited_title":"Evidence of a J/ψΛ structure and observa- tion of excited Ξ− states in the Ξ− b → J/ψΛK− decay,","cited_arxiv_id":null,"evidence_quote":"Supplies the observed mass and width of Pψs(4459) used as the comparison target for the Ξc\\bar{D}∗ poles."},{"cited_title":"Observation of a J/ψΛ Resonance Con- sistent with a Strange Pentaquark Candidate in B−→ J/ψΛp De- cays,","cited_arxiv_id":null,"evidence_quote":"Supplies the observed mass and width of Pψs(4338) used as the comparison target for the Ξc\\bar{D} pole."},{"cited_title":"Molecular states from Σ(∗) c ¯D(∗)−Λc ¯D(∗) interaction,","cited_arxiv_id":null,"evidence_quote":"Supplies the method of encoding interaction vertices and propagators directly in code to construct the coupled-channel potentials."},{"cited_title":"The Zc(3900) as a resonance from the D ¯D∗ interaction,","cited_arxiv_id":null,"evidence_quote":"Supplies the quasipotential Bethe-Salpeter discretization and propagator regularization used to solve the scattering equation."},{"cited_title":"Low lying axial-vector mes ons as dynamically generated resonances,","cited_arxiv_id":null,"evidence_quote":"Supplies the Riemann-sheet prescription used to locate poles in the complex energy plane."}],"review_version":1}