Onset of constituent quark number scaling in heavy-ion collisions at RHIC
Partonic collectivity is one of the necessary signatures for the formation of quark-gluon plasma in high-energy nuclear collisions. Number of constituent quarks (NCQ) scaling has been observed for hadron elliptic flow 𝑣2 in top energy nuclear collisions at the Relativistic Heavy Ion Collider and the...
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| Main Authors: | , , , , |
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| Corporate Author: | |
| Format: | Article (Journal) |
| Language: | English |
| Published: |
11 August, 2025
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| In: |
Physical review letters
Year: 2025, Volume: 135, Issue: 7, Pages: 1-8 |
| ISSN: | 1079-7114 |
| DOI: | 10.1103/2qhx-cp79 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/2qhx-cp79 Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/2qhx-cp79 
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| Author Notes: | STAR Collaboration* |
MARC
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| 520 | |a Partonic collectivity is one of the necessary signatures for the formation of quark-gluon plasma in high-energy nuclear collisions. Number of constituent quarks (NCQ) scaling has been observed for hadron elliptic flow 2 in top energy nuclear collisions at the Relativistic Heavy Ion Collider and the LHC, and this has been theoretically suggested as strong evidence for partonic collectivity. In this Letter, a systematic analysis of 2 of ±, ±, 0, , and Λ in Au+Au collisions at √NN=3.2, 3.5, 3.9, and 4.5 GeV, with the STAR experiment at the Relativistic Heavy Ion Collider, is presented. NCQ scaling is markedly violated at 3.2 GeV, consistent with a hadronic-interaction dominated equation of state. However, as the collision energy increases, a gradual evolution to NCQ scaling is observed. This beam-energy dependence of 2 for all hadrons studied provides evidence for the onset of dominant partonic interactions by √NN=4.5 GeV. | ||
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