{"id":"d1b5a35e-42ce-4d8c-aa0f-e3fe7fbd8913","arxiv_id":"2412.20939","paper_version":1,"verdict":"UNVERDICTED","confidence":"MODERATE","novelty_score":1.0,"correctness_risk":"low","formal_verification":"none","parameter_count":0,"one_line_summary":"A proceedings summary of already published ALICE charm production measurements in pp and p-Pb collisions, with no new data or analysis.","lead":"This conference contribution summarizes ALICE measurements of charm hadron production in pp and p-Pb collisions at 5.02 TeV. It reviews yield ratios, baryon-to-meson ratios, fragmentation fractions, and total charm cross sections, comparing them with model predictions.","discovery_kind":"review","skeptic_critique":{"model":"deepseek-v4-flash","headline":"The central pp–pPb comparison lacks a citable source for the p–Pb fragmentation fractions, so the claimed agreement may be partly inherited from pp assumptions rather than independently measured.","rationale":"The reader's verdict of UNVERDICTED is appropriate and unchanged. The paper is a conference proceedings that restates previously published ALICE results, and the central claim about unmodified hadronisation inherits the reliability of those results. However, the manuscript's treatment of the p–Pb fragmentation fractions is incomplete: unlike the D-meson and Λc+ measurements, no reference is given for the p–Pb fragmentation fractions, and the text does not specify which hadron species enter the p–Pb sum. This is a missing-support issue that the reader's weakest-assumption analysis did not directly identify. The reader instead flagged the RQM feed-down correction as the weakest assumption; I partially agree because model-dependent corrections can bias the p–Pb fractions, but the more immediate and checkable problem is the unreferenced p–Pb measurement. If the p–Pb fractions were derived assuming pp fractions, the agreement would be tautological. The concrete test above would settle this. I recommend keeping the reader's verdict of UNVERDICTED because the paper as written does not supply enough information to verify the central comparison; this concern reinforces, rather than changes, the unverified status.","tokens_in":5068,"tokens_out":11149,"duration_ms":114016,"concrete_test":"Obtain the ALICE p–Pb fragmentation-fraction measurement (published paper, preprint, or collaboration-internal document) and verify: (1) which charm-hadron species are directly measured in p–Pb collisions at √sNN = 5.02 TeV; (2) whether the Λc+/D0 ratio from Ref. [2] is the only p–Pb input to the fractions; (3) whether any p–Pb fraction is set equal to the pp value by assumption. If the agreement between pp and p–Pb is an output of independent measurements, the concern is resolved; if any species is assumed from pp, the conclusion is circular and must be rephrased.","verdict_should_be":"UNCHANGED","load_bearing_attack":"Section 3 states: \"The charm fragmentation fractions measured in pp and p–Pb collisions agree with each other\" and uses this as the basis for the conclusion that hadronisation mechanisms are not modified. All other measurements in the paper cite ALICE publications [1,2,15], but no reference or description is given for the p–Pb fragmentation fractions. The right panel of Fig. 3 sums D0, D+, D+s, Λc+, Ξc0,+ and their charge conjugates in pp and p–Pb; for p–Pb it is not stated which of these are actually measured at 5.02 TeV. If the p–Pb fractions are normalized using pp values for unmeasured species (e.g., Ξc+ or the missing Ωc0), the agreement with pp is partially by construction, making the central claim circular. The reader's concern about RQM feed-down is related, but the RQM appears in the list of model predictions in Section 2, not as a data correction; the more immediate evidentiary gap is the absent source for the p–Pb fraction measurement itself. Without that source, the central comparison cannot be independently checked.","agreement_with_reader":"partial"},"referee_report":{"model":"deepseek-v4-flash","summary":"This paper is a conference proceedings contribution on behalf of the ALICE Collaboration. It summarizes measurements of prompt D0, D+, D+s mesons and Lambda_c+ baryons at midrapidity in pp and p-Pb collisions at sqrt(s_NN) = 5.02 TeV, comparing the measured pT-differential ratios with several hadronisation models (PYTHIA 8 tunes, Catania, QCM, SHM with RQM feed-down). It then presents charm fragmentation fractions and the total charm production cross section per unit rapidity at midrapidity. The central claim is that the fragmentation fractions measured in pp and p-Pb collisions agree with each other, which the authors interpret as evidence that charm hadronisation is not modified from pp to p-Pb collisions. The paper also reports an apparent shift in the peak of the Lambda_c+/D0 ratio between the two systems.","tokens_in":5239,"tokens_out":2746,"duration_ms":27768,"significance":"If the central claim is correct, the result provides an important experimental constraint on models of charm hadronisation in nuclear collisions, particularly regarding whether cold nuclear matter effects or collective phenomena modify baryon-to-meson ratios. The paper's strength is that it rests on peer-reviewed ALICE measurements (refs. [1,2,15]); it gives a concise overview of a substantial body of data and model comparisons, including the first Lambda_c+/D0 measurement down to pT = 0 in p-Pb collisions. However, as a standalone article it does not contain the data tables or derivation steps needed to verify the central comparison, and one key comparison is not traceable to a cited source. The significance of the conclusion is therefore somewhat weakened by the missing documentation of the p-Pb fragmentation fractions.","major_comments":[{"comment":"The central claim that \"the charm fragmentation fractions measured in pp and p-Pb collisions agree with each other\" is not supported by any cited source for the p-Pb fragmentation fractions. Unlike the other measurements, which cite refs. [1], [2], and [15], no reference or description is given for how the f(c -> H_c) values in p-Pb collisions were obtained. If the p-Pb sum in the right panel of Fig. 3 is normalized using pp values for species not measured in p-Pb (for example, Xi_c or Omega_c), the agreement is at least partly by construction. Please provide the reference for the p-Pb fragmentation fractions and state explicitly which charm-hadron species are measured in p-Pb at 5.02 TeV and how any unmeasured species are treated.","section":"Section 3, left panel of Fig. 3"},{"comment":"Reference [17] is cited as the source of the NNLO predictions for the total charm production cross section, but ref. [17] (d'Enterria and Snigirev, \"Triple parton scatterings in high-energy proton-proton collisions\", Phys. Rev. Lett. 118, 122001 (2017)) does not contain NNLO predictions for charm production. The citation is mismatched, so the comparison with \"NNLO [17]\" in the text and figure cannot be checked. The authors should either cite the correct NNLO calculation for charm production at the LHC or reword the text to describe what ref. [17] actually provides.","section":"Section 3 and Fig. 3 right panel"}],"minor_comments":[{"comment":"The manuscript contains repeated placeholder metadata such as \"Journal Not Specified\", \"2023, 1, 0\", and \"Version December 31, 2024 submitted to Journal Not Specified\"; these should be removed or replaced before submission.","section":"Title and metadata"},{"comment":"References [15] and [19] are identical; they should be merged or renumbered.","section":"References"},{"comment":"The sentence \"Within uncertainties, the Lambda_c+/D0 ratios agree between the two collision systems\" would benefit from a quantitative compatibility statement (for example, a chi-square or p-value), because the qualitative wording does not convey the size of the uncertainties or the degree of agreement.","section":"Section 2, Fig. 2"},{"comment":"The caption of the left panel of Fig. 2 states the Lambda_c+/D0 ratio in pp collisions is compared with theoretical calculations, but the text does not identify which curves correspond to which model; please make the legend or caption self-contained.","section":"Section 2, Fig. 2 left panel"}],"recommendation":"major_revision","confidential_remarks":"The missing citation for the p-Pb fragmentation fractions is a load-bearing issue: it is the entire basis for the paper's main physics conclusion. The authors must either supply the reference and specify the treatment of unmeasured species, or soften the claim to what is actually directly measured (e.g., the Lambda_c+/D0 ratio). The mismatched NNLO reference [17] also needs correction, though it is less central. The paper is otherwise a competent proceedings summary, and the underlying ALICE measurements are well established."},"author_rebuttal":null,"desk_editor":{"model":"deepseek-v4-flash","letter":"This is a conference proceedings writeup, not a new measurement. Every plot and number traces back to ALICE papers [1,2,15]. What it does well: it gives a compact, accurate summary of the charm hadronisation measurements at 5.02 TeV, including the first Λc+/D0 down to pT=0 in p-Pb, and it lays out the model comparisons (PYTHIA, Catania, QCM, SHM) in a way that is easy to follow. For someone wanting a quick entry into the ALICE charm results, it is a fine overview.\n\nThe soft spots. The central claim in Section 3 — that the charm fragmentation fractions in pp and p-Pb agree — appears without a reference for the p-Pb fractions. The text says the cross section is a sum of D0, D+, D+s, Λc+, Ξc0,+ and charge conjugates, but it does not say which species are actually measured in p-Pb at 5.02 TeV or how the unmeasured ones are handled. If some species are filled with pp values, the agreement is partly built in. That needs to be stated or cited. Also, ref [17] is d'Enterria and Snigirev on triple parton scatterings, not an NNLO charm production calculation; the comparison with \"NNLO\" in Fig. 3 needs the right citation. The RQM feed-down issue the reader flagged is real but less central than it seemed: the RQM appears as one of the model predictions in Section 2, not as a correction applied to the data.\n\nNet: this is an archival/expository paper. It deserves to be read as a proceedings note, not as a research preprint. If it is going into a conference proceedings, fix the missing source and the ref [17] mismatch and it is fine. If it is submitted as a regular research paper, the lack of new content is grounds for a desk reject. I would not send it to a full referee.","headline":"A clear proceedings summary of already-published ALICE charm results; the pp–pPb fragmentation-fraction comparison is asserted without a citable source.","tokens_in":5743,"tokens_out":2325,"would_cite":false,"duration_ms":23026,"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":"Charm fragmentation fractions measured in pp and p-Pb collisions at 5.02 TeV agree with each other, indicating that hadronisation is not modified between the two systems, while both differ from e+e- results, showing hadronisation depends…","keywords":["charm production","hadronisation","fragmentation fractions","Lambda_c baryon","D meson production","p-Pb collisions","heavy flavour"],"falsifier":"Measure the production of the excited charm baryon states that feed $\\Lambda_c^+$ in both collision systems: if their feed-down contributions differ between pp and p-Pb in a way that moves the fragmentation fractions apart, the unmodified-hadronisation claim would be falsified. A sufficiently precise measurement of the $\\Lambda_c^+/D^0$ ratio in p-Pb at low $p_{\\rm T}$ could also reveal a genuine difference from pp, directly testing the same claim.","tokens_in":4859,"feed_emoji":"⚛️","tokens_out":9288,"duration_ms":80007,"temperature":0.7,"pith_summary":"This contribution presents measurements of D0, D+, Ds+, and Lambda_c+ production at midrapidity in pp and p-Pb collisions at sqrt(sNN) = 5.02 TeV. It reports the first Lambda_c+/D0 ratio in p-Pb down to pT = 0 and compares it with pp data and with model predictions. The central result is that the charm fragmentation fractions, the probabilities that a charm quark turns into each hadron species, agree between pp and p-Pb within uncertainties, suggesting that hadronisation is not modified from pp to p-Pb collisions. By contrast, these fractions differ from those measured in e+e- and ep collisions, indicating that charm hadronisation is not universal but depends on the collision system. The total charm production cross section per unit rapidity scaled by the Pb mass number is compatible between p-Pb and pp and lies on the upper edge of pQCD predictions.","feed_headline":"Charm fragmentation fractions agree between pp and p-Pb collisions","feed_subtitle":"Measured fractions show hadronisation is unchanged from pp to p-Pb, unlike e+e- collisions.","key_machinery":"The central objects are the charm fragmentation fractions $f(c \\to H_c)$, defined as the probability that a charm quark hadronises into a given charm-hadron species, extracted by summing the $p_{\\rm T}$-integrated cross sections of the ground-state charm hadrons D0, D+, Ds+, Lambda_c+, $Xi_c^{0}$, Xi_c+ and Omega_c0 and normalising to the total charm cross section. The Lambda_c+/D0 yield ratio as a function of $p_{\\rm T}$ is the diagnostic used to compare baryon and meson hadronisation; it is compared with predictions from PYTHIA 8 with colour reconnection, the Catania coalescence model, the Quark (re)-Combination Model, and the Statistical Hadronisation Model, including feed-down from excited charm baryons predicted by the Relativistic Quark Model. The feed-down correction from the yet-unmeasured excited states is the correction that carries the argument for the absolute values of the fragmentation fractions.","core_discovery":"The paper establishes that, within current experimental uncertainties, the charm-quark fragmentation fractions measured in p-Pb collisions at sqrt(sNN) = 5.02 TeV are consistent with those in pp collisions, so the hadronisation mechanisms are not modified from pp to p-Pb. It also establishes that the Lambda_c+/D0 ratio in p-Pb is measured for the first time down to pT = 0 and is described, within uncertainties, by the same models that describe pp data; the peak of the ratio shifts to somewhat higher pT in p-Pb, an effect the Quark (re)-Combination Model attributes to a hardening of the Lambda_c spectrum. The fragmentation fractions in both systems differ from those measured in e+e- and ep collisions, supporting the conclusion that charm hadronisation is not universal.","pith_inferences":["Beyond the paper, the pp/p-Pb agreement gives a clean cold-matter baseline: any enhancement of charm-baryon production observed in Pb-Pb collisions relative to this baseline could be attributed to quark-gluon plasma effects rather than to the nuclear environment.","If the Relativistic Quark Model feed-down assumption is replaced by measured excited-state yields in the future, the absolute values of the fragmentation fractions may shift, but the pp versus p-Pb comparison would remain the cleanest probe of hadronisation modification.","A testable extension is to measure the Lambda_c+/D0 ratio in p-Pb in different centrality classes and correlate the position of the peak with the mean transverse momentum of light-flavour hadrons; a mass-dependent shift would confirm radial flow as the cause.","The system dependence of fragmentation fractions suggests that global event properties, such as final-state multiplicity, may be a better variable than collision system for organising charm-hadronisation measurements."],"forward_implications":["If the central claim is correct, charm hadronisation is not universal: fragmentation functions tuned to e+e- and ep collisions underpredict charm-baryon production in hadronic collisions, so models must include recombination or colour-reconnection effects to describe pp and p-Pb data.","Cold nuclear matter effects and any collective phenomena present in p-Pb collisions do not change the overall pattern of charm hadronisation relative to pp at 5.02 TeV, within current uncertainties.","The shift of the Lambda_c+/D0 peak towards higher $p_{\\rm T}$ in p-Pb, if driven by radial flow, means the baryon-to-meson ratio is sensitive to collective expansion and can be used to study it.","The total charm production cross section per unit rapidity in p-Pb scaled by the Pb mass number being compatible with pp supports the factorisation of charm production and provides a baseline for heavier-ion collisions.","Run 3 and Run 4 data with lower uncertainties will be able to test whether small differences currently hidden by uncertainties become visible."],"supporting_citations":[{"why":"Supplies the D0, D+, Ds+ meson cross sections and meson-to-meson ratios used to build the fragmentation fractions.","marker":"[1]"},{"why":"Provides the Lambda_c+/D0 ratio down to pT=0 in pp and p-Pb, the central data for the baryon-to-meson comparison.","marker":"[2]"},{"why":"Gives the pp charm fragmentation fractions and total charm cross section that the p-Pb results are compared with.","marker":"[15]"},{"why":"Provides the FONLL pQCD predictions for the total charm cross section at LHC energies used as the theoretical comparison.","marker":"[16]"},{"why":"Supplies the combined e+e- and ep fragmentation-fraction measurements that establish the non-universality of hadronisation.","marker":"[18]"}],"fun_headline_variants":["Charm hadronisation unchanged from pp to p-Pb","First Lambda_c/D0 ratio down to pT=0 in p-Pb","Charm fragmentation fractions agree in pp and p-Pb","p-Pb charm fragmentation mirrors pp, not e+e-","Charm hadronisation same in pp and p-Pb, unlike e+e-"],"cache_read_input_tokens":3200,"weakest_assumption_plain":"The conclusion that hadronisation is unmodified from pp to p-Pb collisions assumes the feed-down correction to $\\Lambda_c^+$ from unmeasured excited charm baryon states, computed with the Relativistic Quark Model, is accurate; if this correction is wrong, the reported fragmentation fractions would shift.","fun_headline_variants_meta":{"raw":{"variants":["Charm hadronisation unchanged from pp to p-Pb","First Lambda_c/D0 ratio down to pT=0 in p-Pb","Charm fragmentation fractions agree in pp and p-Pb","p-Pb charm fragmentation mirrors pp, not e+e-","Charm hadronisation same in pp and p-Pb, unlike e+e-"]},"model":"deepseek-v4-flash","effort":"low","cost_usd":0.001016,"raw_usage":{"total_tokens":4297,"prompt_tokens":962,"completion_tokens":3335,"prompt_tokens_details":{"cached_tokens":384},"prompt_cache_hit_tokens":384,"prompt_cache_miss_tokens":578,"completion_tokens_details":{"reasoning_tokens":3241}},"tokens_in":578,"tokens_out":3335,"duration_ms":25958,"temperature":1.0,"reasoning_tokens":3241,"cache_read_input_tokens":384,"cache_creation_input_tokens":0},"cache_creation_input_tokens":0},"created_at":"2026-08-10T23:05:50.814202+00:00","model_set":{"reader":"deepseek-v4-flash"},"falsifier":"Measure the production of the excited charm baryon states that feed $\\Lambda_c^+$ in both collision systems: if their feed-down contributions differ between pp and p-Pb in a way that moves the fragmentation fractions apart, the unmodified-hadronisation claim would be falsified. A sufficiently precise measurement of the $\\Lambda_c^+/D^0$ ratio in p-Pb at low $p_{\\rm T}$ could also reveal a genuine difference from pp, directly testing the same claim.","supporting_citations":[],"review_version":1}