Strange-quark-number-dependent response to partonic dynamics in baryon-rich Au+Au collisions
Abstract
We identify a strange-quark-number-dependent hierarchy in the response to explicit partonic dynamics by comparing PHSD5.2 with its hadron--string limit in baryon-rich Au+Au collisions at snn=3.0--$7.2$~GeV. Crossing the local conversion threshold alone does not ensure a visible final-state signal: abundant-hadron flow changes little at 3--4.5~GeV, whereas the fractional yield response becomes ordered at 6.2--7.2~GeV, reaching S|s|=1≃0.2--$0.3$, S|s|=2≃0.65, and S|s|=3≃0.93 at 7.2~GeV. The hierarchy is consistent with an enlarged recombination phase space for strange constituents released from different pre-hadronic sources, but does not by itself establish an increase in the total s+s̅ abundance or stronger strange-quark clustering. Since SX is a model-defined response rather than a direct observable, matched excitation functions of Ξ-/Λ and Ω-/Λ, together with high-mT proton elliptic flow, provide experimentally accessible discriminants between the predicted PHSD and HSD dynamics.
Versions
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BibTeX
@misc{zhao2026strangequarknumberdependent,
title = {{Strange-quark-number-dependent response to partonic dynamics in baryon-rich Au+Au collisions}},
author = {Di Zhao and Xun Zhu and Gao-Chan Yong},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.19392},
eprint = {2610.19392},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.19392},
}
RIS
TY - UNPB
TI - Strange-quark-number-dependent response to partonic dynamics in baryon-rich Au+Au collisions
AU - Di Zhao
AU - Xun Zhu
AU - Gao-Chan Yong
PY - 2026
DA - 2026/10/14
PB - arXiv
DO - 10.48550/arxiv.2610.19392
UR - https://arxiv.org/abs/2610.19392
AB - We identify a strange-quark-number-dependent hierarchy in the response to explicit partonic dynamics by comparing PHSD5.2 with its hadron--string limit in baryon-rich Au+Au collisions at snn=3.0--$7.2$~GeV. Crossing the local conversion threshold alone does not ensure a visible final-state signal: abundant-hadron flow changes little at 3--4.5~GeV, whereas the fractional yield response becomes ordered at 6.2--7.2~GeV, reaching S_|s|=1≃0.2--$0.3$, S_|s|=2≃0.65, and S_|s|=3≃0.93 at 7.2~GeV. The hierarchy is consistent with an enlarged recombination phase space for strange constituents released from different pre-hadronic sources, but does not by itself establish an increase in the total s+s̅ abundance or stronger strange-quark clustering. Since S_X is a model-defined response rather than a direct observable, matched excitation functions of Ξ^-/Λ and Ω^-/Λ, together with high-m_T proton elliptic flow, provide experimentally accessible discriminants between the predicted PHSD and HSD dynamics.
ER -