Baryon-to-meson ratios in the Lund jet plane: resolving string-junction and thermal-fragmentation effects
Abstract
Baryon-to-meson ratios inside charged jets are studied in the Lund jet plane using PYTHIA simulations of pp collisions at √s = 14 TeV, with 15 < pTch,jet < 30 GeV/c in an acceptance compatible with the future ALICE 3 detector. Jets are reclustered with the Cambridge--Aachen algorithm and identified hadrons are tagged at the splitting where they first separate from the leading branch. Three model configurations are compared: Monash, color reconnection beyond leading color (CR-BLC), and CR-BLC combined with thermodynamical string fragmentation (Thermal+CR-BLC). The Λc+/D0 ratio rises with log(1/z) in the two configurations that include color-string junctions and is approximately flat under Monash. The same trend is present at the first Cambridge--Aachen branching, indicating that the effect is set at the level of the color topology rather than through the cumulative action of many soft splittings. Light- and strange-sector ratios show no z-dependent signature of either mechanism, but the angular projection reveals non-trivial structure at the first branching that is washed out when emissions are summed. The Cambridge--Aachen declustering and the Lund plane together separate the kinematic signatures of the two baryon-enhancement mechanisms in PYTHIA and provide observables accessible to future ALICE 3 measurements.
Versions
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BibTeX
@misc{vertesi2026baryontomeson,
title = {{Baryon-to-meson ratios in the Lund jet plane: resolving string-junction and thermal-fragmentation effects}},
author = {Robert Vertesi},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.18693},
eprint = {2609.18693},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.18693},
}
RIS
TY - UNPB
TI - Baryon-to-meson ratios in the Lund jet plane: resolving string-junction and thermal-fragmentation effects
AU - Robert Vertesi
PY - 2026
DA - 2026/09/16
PB - arXiv
DO - 10.48550/arxiv.2609.18693
UR - https://arxiv.org/abs/2609.18693
AB - Baryon-to-meson ratios inside charged jets are studied in the Lund jet plane using PYTHIA simulations of pp collisions at √s = 14 TeV, with 15 < p_T^ch,jet < 30 GeV/c in an acceptance compatible with the future ALICE 3 detector. Jets are reclustered with the Cambridge--Aachen algorithm and identified hadrons are tagged at the splitting where they first separate from the leading branch. Three model configurations are compared: Monash, color reconnection beyond leading color (CR-BLC), and CR-BLC combined with thermodynamical string fragmentation (Thermal+CR-BLC). The Λ_c^+/D^0 ratio rises with log(1/z) in the two configurations that include color-string junctions and is approximately flat under Monash. The same trend is present at the first Cambridge--Aachen branching, indicating that the effect is set at the level of the color topology rather than through the cumulative action of many soft splittings. Light- and strange-sector ratios show no z-dependent signature of either mechanism, but the angular projection reveals non-trivial structure at the first branching that is washed out when emissions are summed. The Cambridge--Aachen declustering and the Lund plane together separate the kinematic signatures of the two baryon-enhancement mechanisms in PYTHIA and provide observables accessible to future ALICE 3 measurements.
ER -