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Baryon-to-Meson Ratios in Jets from Au+Au and $p$+$p$ Collisions at $\sqrt{s_{\mathrm{NN}}} = 200$ GeV

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ReviewThe objections and verdict, as JSON Paper breakdownThe authors' claims, conditions and measurements, as JSON Signed receiptProof this review has not been altered
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The STAR Collaboration

Nuclear Experiment · Submitted 4 Jun 2026 · 27 references

Pith's verdict: STAR reports the first in-jet baryon-to-meson ratios at RHIC and finds them consistent between Au+Au and p+p, but the abstract supplies almost no detail on how background was handled in the heavy-ion case.

T0 · AI review

How this review was made: An AI referee (grok-4.3) read the paper on June 27, 2026 and answered a fixed list of questions about it. T0 is the starting level every paper gets. The levels describe how deeply Pith has checked the paper, never the authors.

  1. T0 AI review An AI read the paper and answered a fixed list of questions.
  2. T1 Audit Automatic checks that the references and files the paper relies on exist and match.
  3. T2 Compute The paper's code or calculations re-run with the same results.
  4. T3 Formal statement The claims written out in a formal math language a computer can read.
  5. T4 Proof Those claims proved, and the proof checked by computer.

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arXiv ID2606.06551 (version 1)
Pith IDVKCH5NG6, Pith's permanent record of this paper and its review
CitationThe STAR Collaboration. "Baryon-to-Meson Ratios in Jets from Au+Au and $p$+$p$ Collisions at $\sqrt{s_{\mathrm{NN}}} = 200$ GeV." arXiv:2606.06551 (2026). https://pith.science/paper/VKCH5NG6
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The paper

The paper claims

In-jet proton-to-pion ratios remain consistent between Au+Au and p+p collisions at intermediate transverse momenta.

The reading

The paper measures baryon-to-meson yield ratios inside reconstructed jets in both heavy-ion and proton-proton collisions at RHIC. It finds these ratios match within uncertainties for particles with 2 to 5 GeV/c transverse momentum, even though the overall particle production in the two systems differs markedly. This suggests that any medium effects on particle composition act on the bulk matter rather than on the fragments inside jets. The measurement uses jet-track correlations and particle identification to isolate the jet-associated hadrons.

What carries the argument

Jet-track correlation and particle identification to extract baryon-to-meson yield ratios for charged hadrons within a radial distance R of the reconstructed jet axis.

Extended reading notes

Core claim

The measured in-jet ratios are found to be consistent within uncertainties between the two systems for the selected kinematic regime, despite significant differences between inclusive ratios for the same systems.

Load-bearing premise

The jet-track correlation and particle identification cleanly isolate jet-associated particles without significant contamination from the underlying event in Au+Au collisions.

Editorial extensions

If this is right

  • In-jet fragmentation patterns show no significant modification from the quark-gluon plasma at these momenta.
  • Previous indications from hadron-hadron correlations that jet-related ratios differ from bulk production are confirmed with full jet reconstruction.
  • The similarity holds for the first in-cone measurement at RHIC energies.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • The baryon enhancement observed in inclusive spectra of heavy-ion collisions likely originates from the underlying event rather than from jet fragmentation.
  • Future measurements at higher jet momenta could test whether this consistency persists or breaks down.
  • Comparison with models of medium-modified fragmentation functions would help interpret the lack of difference.
Original abstract

Jet probes have been used extensively to gain insights into QGP properties, with substantial modifications to jet yields and internal structures seen across multiple measurements, compared against $p$+$p$ results. Despite apparent medium-induced changes to jet fragmentation patterns and strong modifications of particle production at intermediate momenta ($2.0 < p_{\rm{T}} < 5.0$ GeV/$c$) in heavy ion collisions, RHIC hadron-hadron correlation results indicate that jet-related baryon-to-meson ratios remain similar to those of $p$+$p$ measurements and are significantly different from those of the QGP bulk. To look for possible medium effects on jet fragments at RHIC, we employ jet-track correlation and particle identification to perform the first measurement of in-jet proton-to-pion yield ratios for charged-hadrons with $2.0 < p_{\rm{T}} < 5.0$ GeV/$c$. We present the first in-cone (within a radial distance of $R$ from the determined jet axis direction) baryon-to-meson yield ratios associated with reconstructed charged-particle jets from Au+Au and $p$+$p$ collisions at $\sqrt{s_{\mathrm{NN}}} = 200$ GeV using the STAR detector at RHIC. The measured in-jet ratios are found to be consistent within uncertainties between the two systems for the selected kinematic regime, despite significant differences between inclusive ratios for the same systems.

The compiled record

The paper's own sentences, arranged, kept beside the review and separate from it. Each label is drawn from a closed vocabulary; the number beside it is the probability the classifier gave that label. Numbers in the tables are the authors', checked by code. No sentence in this record was written by a model.

Compiled by classifier-1.13.0 via TypeSafe API, question bank abstract-p1-20260923, 2026-09-23: 1 request, 4,699 input tokens.

What the abstract itself states, as probabilities: claims first 0.96 · states limitation 0.32 · human participants 0.01 · controlled comparison 0.93 · randomized assignment 0.01 · states quantitative result 0.22 · compares with prior results 0.95 · mentions code or data availability 0.02.

The abstract, sentence by sentence

arXiv listing abstract v1. Results and the main claim are underlined; .

Jet probes have been used extensively to gain insights into QGP properties, with substantial modifications to jet yields and internal structures seen across multiple measurements, compared against $p$+$p$ results. Despite apparent medium-induced changes to jet fragmentation patterns and strong modifications of particle production at intermediate momenta ($2.0 < p_{\rm{T}} < 5.0$ GeV/$c$) in heavy ion collisions, RHIC hadron-hadron correlation results indicate that jet-related baryon-to-meson ratios remain similar to those of $p$+$p$ measurements and are significantly different from those of the QGP bulk. To look for possible medium effects on jet fragments at RHIC, we employ jet-track correlation and particle identification to perform the first measurement of in-jet proton-to-pion yield ratios for charged-hadrons with $2.0 < p_{\rm{T}} < 5.0$ GeV/$c$. We present the first in-cone (within a radial distance of $R$ from the determined jet axis direction) baryon-to-meson yield ratios associated with reconstructed charged-particle jets from Au+Au and $p$+$p$ collisions at $\sqrt{s_{\mathrm{NN}}} = 200$ GeV using the STAR detector at RHIC. The measured in-jet ratios are found to be consistent within uncertainties between the two systems for the selected kinematic regime, despite significant differences between inclusive ratios for the same systems.

background contribution method result interpretation main claim

What the classifier reports for each sentence. The number is the probability it gave the label.
#sentencerolethe authors' own workstates the main conclusionstrength
s0 Jet probes have been used extensively to gain insights into QGP properties, with substantial modifications to jet yields and internal structures seen across multiple measurements, compared against $p$+$p$ results. background 1.00 0.06 0.03 asserted 1.00
s1 Despite apparent medium-induced changes to jet fragmentation patterns and strong modifications of particle production at intermediate momenta ($2.0 < p_{\rm{T}} < 5.0$ GeV/$c$) in heavy ion collisions, RHIC hadron-hadron correlation results indicate that jet-related baryon-to-meson ratios remain similar to those of $p$+$p$ measurements and are significantly different from those of the QGP bulk. background 0.72 0.12 0.65 hedged possibility 0.70
s2 To look for possible medium effects on jet fragments at RHIC, we employ jet-track correlation and particle identification to perform the first measurement of in-jet proton-to-pion yield ratios for charged-hadrons with $2.0 < p_{\rm{T}} < 5.0$ GeV/$c$. contribution 0.81 0.95 0.04 asserted 0.81
s3 We present the first in-cone (within a radial distance of $R$ from the determined jet axis direction) baryon-to-meson yield ratios associated with reconstructed charged-particle jets from Au+Au and $p$+$p$ collisions at $\sqrt{s_{\mathrm{NN}}} = 200$ GeV using the STAR detector at RHIC. contribution 0.90 0.96 0.08 asserted 1.00
s4 The measured in-jet ratios are found to be consistent within uncertainties between the two systems for the selected kinematic regime, despite significant differences between inclusive ratios for the same systems. result 1.00 0.97 0.85 asserted 0.74

What kind of paper the classifier reports this is: empirical study 1.00 · evidence from observation or experiment 0.98.

What was examined, and what was not

sources read
  • arXiv listing abstract v1
not examined
  • full text
  • figures and tables
  • references and citing sentences
  • relations to other papers
levels run
  • P abstract
not run
  • S sections
  • T body sentences
  • C citations
  • R cross-paper relations

Every quoted sentence on this record is the authors'. Every label is from Pith's closed vocabulary, with the probability shown beside it. Every number in the measurements table is the authors', checked by code. Record as JSON

Figures
Figure 1. (left) In-jet 2D PID distribution with 2
Figure 2. In-jet p/π ratios for p+p and 0 − 10% central Au+Au collisions, with p jet T > 9 GeV/c and p cons T > 2.0 GeV/c. Published inclusive p/π ratios are included for both systems [8, 25]. Inclusive hadron p/π ratios are presented with weak-decay feed-down corrections to the measured pion spectra. In-jet measurements are presented without correction for weak-decay feed-down. Three different jet R parameters are presented: (left) R = 0.2, (center) R = 0.3, (right) R = 0.4. 2 2.5 3 3.5 4 4.5 5 [GeV/c] T p 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 π p/ > 9 GeV/c T jet p R = 0.3 T Anti-k > 2…
Figure 3. In-jet p/π ratios for p+p and 0 − 10% central Au+Au collisions, with p jet T > 9 GeV/c and p cons T > 3.0 GeV/c. Comparison against dashed lines representing in-jet ratios for jets with p cons T > 2.0 GeV/c, as presented in

Figures reproduced from arXiv:2606.06551 by the authors.

References
How the literature uses it

What this paper does with the arXiv papers it cites

Each citing sentence is taken from the citing paper's LaTeX source and typed by Pith's classifier. A label appears at probability 0.8 or more (0.95 for support), a contest at 0.7 or more; the quoted words are the citing authors'. How each label was checked · JSON

What it cites · 12 sentences without a confident label

Uses the method or tool of 2 papers

Discussion

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