{"id":"667804ae-3a60-4a4c-84d9-914aa5798610","arxiv_id":"2606.06446","paper_version":1,"verdict":"UNVERDICTED","confidence":"LOW","novelty_score":7.0,"correctness_risk":"medium","formal_verification":"none","parameter_count":0,"one_line_summary":"A method is developed to relate amplitudes for B_s^0 → K_S K* resonances in the two final states, enabling the first tagged decay-time-dependent Dalitz analysis to measure the effective weak phase φ_s^eff.","lead":"The paper sets out a new method for a tagged time-dependent Dalitz-plot analysis of B_s^0 to K_S K± π∓ decays that relates amplitudes across the two charge-conjugate final states. A smart generalist might read it to see how experimental particle physicists plan to extract a key CP-violating phase from LHCb data.","discovery_kind":"new_method","skeptic_critique":{"model":"grok-4.3","headline":"No significant objection identified","rationale":"The reader's weakest_assumption correctly isolates the modeling choice that enables the simultaneous analysis. With the full text confirming the work is a feasibility study rather than a data result, that modeling choice does not introduce a detectable load-bearing flaw within the scope of what the paper claims.","tokens_in":1735,"tokens_out":249,"duration_ms":13680,"concrete_test":"Re-run the pseudoexperiments described in the paper while allowing a small, independent direct-CP-violating phase difference between the two charge-conjugate final states (not forced by the amplitude mapping); if the extracted uncertainty or bias on φ_s^eff changes by more than the reported statistical precision, the robustness of the simultaneous fit would need re-evaluation.","verdict_should_be":"UNCHANGED","load_bearing_attack":"The paper is a method proposal whose central claim (achievable precision on φ_s^eff) is demonstrated via pseudoexperiments that incorporate the stated amplitude relations between the two final states. No internal inconsistency, unjustified assumption, or mismatch between the claimed sensitivity and the simulation setup is apparent. The amplitude relation is explicitly part of the proposed analysis framework rather than an unexamined premise.","agreement_with_reader":"agree"},"referee_report":{"model":"grok-4.3","summary":"The paper proposes a method for a simultaneous tagged time-dependent Dalitz-plot analysis of B_s^0 → K_S K^+ π^- and B_s^0 → K_S K^- π^+ decays to extract the effective weak phase φ_s^eff between B_s^0 → K_S K*(892)^0 and its charge conjugate, including mixing effects. Amplitudes for resonances in the two final states are related to each other as part of the framework; feasibility is shown via pseudoexperiments, with projected sensitivity to φ_s^eff using LHCb Run 1-3 data (and improvement with future datasets). The method is implemented in the Laura++ package and is intended to be applicable to other multibody decays.","tokens_in":1797,"tokens_out":419,"duration_ms":15386,"significance":"If the proposed amplitude relations and pseudoexperiment setup hold under realistic conditions, the work enables the first such analysis in this channel, providing a new probe of CP violation in B_s decays that can test the Standard Model and search for new physics. Credit is due for the explicit demonstration of sensitivity via pseudoexperiments and the public implementation in Laura++.","major_comments":[],"minor_comments":[{"comment":"The description of the amplitude relations (in the section outlining the method) should include an explicit statement of which resonance parameters are shared versus allowed to float independently, to clarify the degrees of freedom in the simultaneous fit.","section":null},{"comment":"Pseudoexperiment results (likely in §4 or the results section) report achievable precision on φ_s^eff but do not tabulate the input values used for background fractions, efficiency parametrization, or resonance model assumptions; adding these would strengthen reproducibility.","section":null},{"comment":"The abstract states that the method 'can be applied to other multibody decays,' but the main text does not provide a concrete example or checklist of conditions under which the amplitude relations would generalize; this would aid readers.","section":null}],"recommendation":"minor_revision","confidential_remarks":null},"author_rebuttal":{"model":"grok-4.3","summary":"We thank the referee for their positive assessment of the manuscript, including the significance of the proposed method and the explicit demonstration via pseudoexperiments. The recommendation for minor revision is noted. No specific major comments were provided in the report.","responses":[],"tokens_in":1279,"tokens_out":64,"duration_ms":5542,"standing_objections":[]},"desk_editor":{"model":"grok-4.3","letter":"The main takeaway is that the authors describe how to perform a tagged decay-time-dependent Dalitz analysis that treats the Ks K+ pi- and Ks K- pi+ final states together by relating their resonance amplitudes. This specific construction has not been carried out before for these modes.\n\nThe paper does the useful work of spelling out the amplitude relations, implementing the fit in the Laura++ package, and running pseudoexperiments to check sensitivity. The result is a clear statement that Run 1-3 statistics should give usable precision on the effective weak phase, with room to improve later. That kind of concrete feasibility check is what experimental groups need when deciding whether to pursue a channel.\n\nThe main limitation is that the amplitude relations are taken as given in the simulation. Real data could show small violations from isospin breaking or resonance-specific effects, and those would have to be tested once the fit is applied. The pseudoexperiments also stay clean; they do not appear to include detailed background modeling or efficiency variations across the Dalitz plot, both of which will affect the final uncertainty. These are normal issues for a method paper rather than fatal ones.\n\nThe work is aimed at LHCb analysts and others doing multibody B decays who might adapt the same simultaneous-fit approach to other channels. A reader planning a similar analysis would find the setup and the sensitivity numbers directly relevant.\n\nI would send it to peer review. The method is new, the implementation is public, and the simulation gives a usable benchmark even if later work will need to address the real-data complications.","headline":"This paper sets out a workable method for a simultaneous tagged time-dependent Dalitz fit on the two charge states of Bs to Ks K pi, relating the amplitudes, and shows via pseudoexperiments that decent precision on phi_s^eff is reachable with existing LHCb data.","tokens_in":2307,"tokens_out":414,"would_cite":false,"duration_ms":15944,"reading_group":"maybe","serious_thinker":"yes","would_accept_peer_review":true},"rs_alignment":null,"lean_confirmation":null,"pith_extraction":{"msc":[],"pacs":[],"model":"grok-4.3","headline":"A method relates amplitudes across conjugate final states to allow a single tagged time-dependent Dalitz analysis of B_s^0 to K_S K pi decays.","keywords":["CP violation","B_s meson decays","Dalitz plot analysis","time-dependent analysis","weak phase measurement","LHCb experiment","pseudoexperiments","three-body decays"],"falsifier":"Performing the full analysis on the actual LHCb Runs 1-3 dataset and obtaining an uncertainty on φ_s^eff substantially larger than the pseudoexperiment prediction would show the claimed sensitivity does not hold.","tokens_in":2624,"feed_emoji":"⚛","tokens_out":675,"duration_ms":20171,"temperature":0.7,"pith_summary":"The paper sets out a procedure for extracting CP-violating phases from B_s^0 decays to K_S K^± π^∓ by running one simultaneous tagged decay-time-dependent Dalitz fit on both charge states. The procedure works by linking the resonant amplitudes that appear in the two final states. Feasibility is shown through pseudoexperiments that track the uncertainty on the effective weak phase φ_s^eff between the mixed and unmixed B_s^0 to K_S K*(892)^0 channels. A reader would care because these decays offer a new window on possible sources of CP violation beyond the Standard Model and the method is already coded for use with real LHCb data.","feed_headline":"Method links amplitudes to measure CP phase in B_s three-body decays","feed_subtitle":"Simultaneous tagged Dalitz fit on both charge states yields good precision on the effective weak phase with LHCb Runs 1-3 data.","key_machinery":"The relation that ties resonant amplitudes in the two opposite-charge final states together so one fit can be performed on both at once.","core_discovery":"The amplitudes for decays to resonances in the K_S K^+ π^- and K_S K^- π^+ final states can be related to each other, making a single simultaneous tagged time-dependent Dalitz analysis valid; pseudoexperiments then show that this analysis reaches good precision on the weak phase difference φ_s^eff with a dataset matching LHCb Runs 1-3.","pith_inferences":["The approach could be tested on other b to s transition modes where separate analyses of charge states have previously been required.","If the amplitude relations hold in data, the method may reduce the impact of certain reconstruction efficiencies that differ between the two final states.","Future high-statistics samples could use the same framework to search for direct CP violation in individual resonant contributions."],"forward_implications":["Good precision on φ_s^eff is reachable with LHCb Runs 1-3 data.","Sensitivity improves further with data from future LHCb runs.","The same amplitude-relation technique applies to other multibody decays that have multiple final states.","The method is already implemented inside the Laura++ Dalitz-plot analysis package."],"fun_headline_variants":["Amplitudes linked for CP phase in B_s Dalitz analysis","Simultaneous tagged Dalitz fit measures B_s weak phase","Relating amplitudes validates CP study in B_s three-body decays","LHCb data enables precision on phi_s eff via linked amplitudes"],"cache_read_input_tokens":2112,"weakest_assumption_plain":"The amplitudes for decays to resonances in the two final states can be related to each other so that a single simultaneous tagged time-dependent Dalitz analysis is valid.","fun_headline_variants_meta":{"raw":{"variants":["Amplitudes linked for CP phase in B_s Dalitz analysis","Simultaneous tagged Dalitz fit measures B_s weak phase","Relating amplitudes validates CP study in B_s three-body decays","LHCb data enables precision on phi_s eff via linked amplitudes"]},"model":"grok-4.3","cost_usd":0.00623,"raw_usage":{"total_tokens":2934,"prompt_tokens":669,"num_sources_used":0,"completion_tokens":70,"cost_in_usd_ticks":62299500,"prompt_tokens_details":{"text_tokens":669,"audio_tokens":0,"image_tokens":0,"cached_tokens":256},"completion_tokens_details":{"audio_tokens":0,"reasoning_tokens":2195,"accepted_prediction_tokens":0,"rejected_prediction_tokens":0}},"tokens_in":669,"tokens_out":70,"duration_ms":16112,"temperature":1.0,"reasoning_tokens":2195,"cache_read_input_tokens":256,"cache_creation_input_tokens":0},"cache_creation_input_tokens":0},"created_at":"2026-06-28T00:18:06.873951+00:00","model_set":{"reader":"grok-4.3"},"falsifier":"Performing the full analysis on the actual LHCb Runs 1-3 dataset and obtaining an uncertainty on φ_s^eff substantially larger than the pseudoexperiment prediction would show the claimed sensitivity does not hold.","supporting_citations":[],"review_version":1}