Effects of a first-order QCD phase transition on light nuclei production
- 1Qingdao University of Technology
- 2Fudan University
- 3Shanghai Research Center for Theoretical Nuclear Physics, NSFC and Fudan University
Abstract
Using an extended Polyakov-looped Nambu–Jona-Lasinio (PNJL) model to describe the baryon density fluctuations of quark matter along the isentropic trajectories corresponding to different s/ρ B s / ρ B values extracted from Au+Au collisions at energies √(sNN) = 7.7−200 s NN = 7.7 - 200 GeV, we investigate the effects of the first-order phase transition on the light nucleus yield ratio Nt × Np/Nd2 N t × N p / N d 2 . The results indicate that the second-order scaled density moment y2 y 2 , used to quantify density fluctuations, rapidly increases to form a peak when the isentropic trajectories pass through the phase coexistence region. We extract the yield ratios Nt× Np/Nd2 N t × N p / N d 2 at chemical freeze-out from the isentropic trajectories at different collision energies and found significant enhancements at 19.6 GeV and 27 GeV. This is similar to the trends observed by the STAR experiment, suggesting that the enhancements in the yield ratios Nt× Np/Nd2 N t × N p / N d 2 observed in the STAR experiment could be explained by the density fluctuations generated in the first-order phase transition region.
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BibTeX
@article{liu2026effects,
title = {{Effects of a first-order QCD phase transition on light nuclei production}},
author = {He Liu and Kai-Jia Sun and Peng-Cheng Chu},
journal = {The European Physical Journal C},
year = {2026},
month = oct,
doi = {10.1140/epjc/s10052-026-16500-7},
url = {https://link.springer.com/article/10.1140/epjc/s10052-026-16500-7},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Effects of a first-order QCD phase transition on light nuclei production
AU - He Liu
AU - Kai-Jia Sun
AU - Peng-Cheng Chu
PY - 2026
DA - 2026/10/26
JO - The European Physical Journal C
DO - 10.1140/epjc/s10052-026-16500-7
UR - https://link.springer.com/article/10.1140/epjc/s10052-026-16500-7
AB - Using an extended Polyakov-looped Nambu–Jona-Lasinio (PNJL) model to describe the baryon density fluctuations of quark matter along the isentropic trajectories corresponding to different s/ρ _B s / ρ B values extracted from Au+Au collisions at energies √(s_NN) = 7.7−200 s NN = 7.7 - 200 GeV, we investigate the effects of the first-order phase transition on the light nucleus yield ratio N_t × N_p/N_d^2 N t × N p / N d 2 . The results indicate that the second-order scaled density moment y_2 y 2 , used to quantify density fluctuations, rapidly increases to form a peak when the isentropic trajectories pass through the phase coexistence region. We extract the yield ratios N_t× N_p/N_d^2 N t × N p / N d 2 at chemical freeze-out from the isentropic trajectories at different collision energies and found significant enhancements at 19.6 GeV and 27 GeV. This is similar to the trends observed by the STAR experiment, suggesting that the enhancements in the yield ratios N_t× N_p/N_d^2 N t × N p / N d 2 observed in the STAR experiment could be explained by the density fluctuations generated in the first-order phase transition region.
SN - 1434-6044
SN - 1434-6052
ER -