{"id":"4426e1d3-960f-4de3-9c09-3780314f80d8","arxiv_id":"2605.02890","paper_version":3,"verdict":"UNVERDICTED","confidence":"LOW","novelty_score":4.0,"correctness_risk":"unknown","formal_verification":"none","parameter_count":0,"one_line_summary":"Collins asymmetries for pion-in-jet production at the EIC are calculated in LO and Weizsacker-Williams approximations, showing quark-channel dominance and clearer access to sea-quark transversity.","lead":"The paper computes Collins azimuthal asymmetries for pion-in-jet production in polarized lepton-proton collisions at EIC kinematics using a simplified TMD approach with transversity and Collins functions taken from SIDIS and e+e- data. A smart generalist might read it to see how future EIC measurements could test whether the Collins function is universal across processes and whether TMD factorization applies here.","discovery_kind":"new_application","skeptic_critique":{"model":"grok-4.3","headline":"No significant objection identified","rationale":"The reader's weakest assumption correctly isolates the transfer step, yet the paper does not treat that step as established fact; it treats the EIC measurement as the probe of whether the step is valid. Because the headline claim is conditional on future data testing the assumption, the transfer step is not load-bearing for the argument as written. No other internal inconsistency (e.g., in the WW implementation or flavor weighting) is evident from the abstract and stated methodology.","tokens_in":1752,"tokens_out":351,"duration_ms":23336,"concrete_test":"Recompute the azimuthal asymmetries in the EIC kinematics both with and without the WW photon term (using the same extracted functions); if the relative gluon-initiated fraction remains below ~10% across the reported x and z bins, the stated dominance and consequent clearer access to transversity hold inside the model; if it rises substantially, the claim of marginal gluon role weakens.","verdict_should_be":"UNCHANGED","load_bearing_attack":"The central claim is that lp collisions yield clearer access to transversity (including sea) via Collins asymmetries because quark channels dominate, and that EIC data comparison can test Collins universality plus TMD factorization for this process class. The calculation adopts the standard extraction of transversity and Collins FF from SIDIS/e+e− and applies them under a simplified TMD framework (collinear initial state, LO + WW photon exchange). The text explicitly frames the EIC comparison as a test of the universality/factorization hypothesis rather than asserting that the hypothesis is already proven for this kinematics. Within that framing, the reported quark dominance under the adopted approximations is internally consistent and does not rely on an unexamined leap.","agreement_with_reader":"disagree"},"referee_report":{"model":"grok-4.3","summary":"The manuscript calculates Collins azimuthal asymmetries for pion-in-jet production in polarized lepton-proton collisions at EIC kinematics. It uses a simplified TMD approach with collinear initial state and transversity and Collins functions extracted from SIDIS and e+e- processes. Asymmetries are computed at leading order and with Weizsäcker-Williams photon exchange, concluding that quark channels dominate allowing clearer access to transversity (including sea) and that EIC data can test Collins universality and TMD factorization.","tokens_in":1900,"tokens_out":314,"duration_ms":26731,"significance":"If the calculations are accurate, this provides a theoretically simpler complement to pp studies for accessing transversity distributions. The explicit framing as a test of the universality hypothesis is a strength, as it avoids overclaiming and positions the work as a useful benchmark for future EIC measurements.","major_comments":[{"comment":"The central claim of quark dominance relies on the adopted approximations (collinear initial state, LO + WW); a quantitative comparison of the gluon contribution magnitude across the kinematic range would strengthen the 'much clearer access' statement.","section":null}],"minor_comments":[{"comment":"Clarify the specific kinematic cuts or ranges used for the EIC predictions to allow reproducibility.","section":null},{"comment":"The abstract mentions 'extending previous analyses of polarized pp scattering'; a brief reference to those works in the introduction would help contextualize the extension.","section":null}],"recommendation":"minor_revision","confidential_remarks":null},"author_rebuttal":{"model":"grok-4.3","summary":"We thank the referee for the positive evaluation of our manuscript and the recommendation for minor revision. We address the major comment below.","responses":[{"response":"We appreciate this observation. Our calculations already indicate that the Weizsäcker-Williams contribution, while relevant across the kinematic range, does not alter the dominance of quark-initiated channels, leaving gluon counterparts with only a marginal role. To strengthen the claim as suggested, we will add in the revised manuscript a quantitative comparison of the gluon and quark contributions (e.g., via ratios or separate curves) across the explored EIC kinematics.","revision_made":"yes","referee_comment":"The central claim of quark dominance relies on the adopted approximations (collinear initial state, LO + WW); a quantitative comparison of the gluon contribution magnitude across the kinematic range would strengthen the 'much clearer access' statement."}],"tokens_in":1255,"tokens_out":202,"duration_ms":29642,"standing_objections":[]},"desk_editor":{"model":"grok-4.3","letter":"The paper computes Collins asymmetries for pion-in-jet production in polarized lepton-proton collisions at EIC kinematics by taking the TMD framework they used earlier for pp scattering and applying it here with collinear initial states. They insert transversity and Collins functions extracted from SIDIS and e+e- data, then run both a leading-order calculation and one that adds the Weizsacker-Williams quasireal photon contribution.\n\nWhat stands out is the clean demonstration that quark channels still dominate across the explored range even after including the photon term, which supports their claim of better access to sea-quark transversity than in pp. The side-by-side LO versus WW comparison is useful and shows the photon piece is relevant but not disruptive.\n\nThe results rest entirely on the external extractions and the assumption that TMD factorization and Collins universality carry over to this process and kinematics. The paper itself treats the EIC data comparison as a future test of those assumptions rather than a confirmation, which keeps the logic consistent. No derivation gaps or ad-hoc cuts are visible in the description, and the approach follows the same simplified TMD setup as their prior work.\n\nThis is aimed at TMD spin phenomenologists who need concrete EIC predictions for planning measurements or global fits. A reader already working in this narrow subfield will get the most from the specific asymmetry values and the sea-quark emphasis.\n\nIt deserves a serious referee. The calculation is incremental but fills a documented gap for the lp channel and is reproducible enough to be checked against future data.","headline":"Straightforward extension of TMD Collins asymmetry calculations from pp to EIC lp collisions that highlights quark dominance but adds no new functions or independent constraints.","tokens_in":2408,"tokens_out":380,"would_cite":false,"duration_ms":19705,"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":"Collins asymmetries in polarized lepton-proton collisions offer clearer access to the transversity distribution at the EIC.","keywords":["Collins asymmetry","pion-in-jet production","transversity distribution","TMD factorization","EIC","lepton-proton collisions","Collins function universality","Weizsacker-Williams approximation"],"falsifier":"Measured Collins asymmetries at the EIC that deviate substantially from the numerical predictions obtained with SIDIS-extracted functions would indicate that universality or TMD factorization fails for this process.","tokens_in":2651,"feed_emoji":"","tokens_out":683,"duration_ms":29490,"temperature":0.7,"pith_summary":"The paper computes Collins azimuthal asymmetries for pion-in-jet production in polarized lepton-proton collisions at the Electron-Ion Collider using a simplified TMD approach. It takes transversity and Collins fragmentation functions extracted from semi-inclusive deep inelastic scattering and electron-positron annihilation and applies them to EIC kinematics. Calculations cover both leading-order quark channels and the Weizsacker-Williams quasireal photon contribution. The results show that quark-initiated processes dominate, giving much clearer access to the transversity distribution including its sea-quark component than in proton-proton scattering. Future comparison with EIC data would test whether the Collins function remains universal and whether TMD factorization applies to this process class.","feed_headline":"Lepton-proton collisions give cleaner view of transversity at EIC","feed_subtitle":"Pion-in-jet Collins asymmetries allow direct access to sea-quark transversity and test factorization assumptions.","key_machinery":"The Collins azimuthal asymmetry generated by the product of the transversity distribution and the Collins fragmentation function inside a simplified TMD framework applied to pion-in-jet production.","core_discovery":"In lepton-proton collisions the Collins asymmetries for pion-in-jet production are carried by quark-initiated channels that directly couple the transversity distribution to the Collins fragmentation function, with the Weizsacker-Williams photon exchange remaining relevant yet not spoiling quark dominance; this yields a cleaner probe of transversity, including sea quarks, than proton-proton scattering and supplies a test of Collins-function universality together with TMD factorization for the process.","pith_inferences":["Global TMD fits could incorporate these lp predictions as a complementary dataset to SIDIS and e+e- data.","If the asymmetries match, the same functions could be applied to other lepton-hadron processes with greater .","Experimental design at the EIC might prioritize polarized lepton-proton runs to isolate sea-quark transversity."],"forward_implications":["Quark-initiated channels dominate the asymmetry over gluon channels across the explored kinematics.","The Weizsacker-Williams photon exchange contributes throughout the range but leaves quark dominance intact.","Sea-quark transversity becomes directly accessible without the gluon dilution present in proton-proton scattering.","Comparison with EIC data supplies an independent test of Collins-function universality and TMD factorization."],"fun_headline_variants":["Collins asymmetries at EIC test transversity in lepton-proton collisions","Lepton-proton collisions at EIC access sea-quark transversity cleanly","Quark channels dominate EIC Collins signals for transversity probe","EIC lepton-proton data tests Collins function universality and TMD factorization"],"cache_read_input_tokens":2112,"weakest_assumption_plain":"The transversity and Collins functions extracted from SIDIS and e+e- annihilation can be transferred without change to pion-in-jet production in polarized lepton-proton collisions, provided TMD factorization and Collins universality hold for these kinematics.","fun_headline_variants_meta":{"raw":{"variants":["Collins asymmetries at EIC test transversity in lepton-proton collisions","Lepton-proton collisions at EIC access sea-quark transversity cleanly","Quark channels dominate EIC Collins signals for transversity probe","EIC lepton-proton data tests Collins function universality and TMD factorization"]},"model":"grok-4.3","cost_usd":0.005575,"raw_usage":{"total_tokens":2674,"prompt_tokens":673,"num_sources_used":0,"completion_tokens":74,"cost_in_usd_ticks":55749500,"prompt_tokens_details":{"text_tokens":673,"audio_tokens":0,"image_tokens":0,"cached_tokens":256},"completion_tokens_details":{"audio_tokens":0,"reasoning_tokens":1927,"accepted_prediction_tokens":0,"rejected_prediction_tokens":0}},"tokens_in":673,"tokens_out":74,"duration_ms":23831,"temperature":1.0,"reasoning_tokens":1927,"cache_read_input_tokens":256,"cache_creation_input_tokens":0},"cache_creation_input_tokens":0},"created_at":"2026-06-30T23:59:18.230860+00:00","model_set":{"reader":"grok-4.3"},"falsifier":"Measured Collins asymmetries at the EIC that deviate substantially from the numerical predictions obtained with SIDIS-extracted functions would indicate that universality or TMD factorization fails for this process.","supporting_citations":[],"review_version":2}