Chin. Phys. Lett.  2023, Vol. 40 Issue (4): 042501    DOI: 10.1088/0256-307X/40/4/042501
NUCLEAR PHYSICS |
Precision Tests of the Nonlinear Mode Coupling of Anisotropic Flow via High-Energy Collisions of Isobars
Jiangyong Jia1,2*, Giuliano Giacalone3*, and Chunjian Zhang1
1Department of Chemistry, Stony Brook University, Stony Brook, NY 11794, USA
2Physics Department, Brookhaven National Laboratory, Upton, NY 11976, USA
3Institut für Theoretische Physik, Universität Heidelberg, Philosophenweg 16, 69120 Heidelberg, Germany
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Jiangyong Jia, Giuliano Giacalone, and Chunjian Zhang 2023 Chin. Phys. Lett. 40 042501
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Abstract Valuable information on dynamics of expanding fluids can be inferred from the response of such systems to perturbations in their initial geometry. We apply this technique in high-energy $^{96}$Ru+$^{96}$Ru and $^{96}$Zr+$^{96}$Zr collisions to scrutinize the expansion dynamics of the quark-gluon plasma, where the initial geometry perturbations are sourced by the differences in deformations and radial profiles between $^{96}$Ru and $^{96}$Zr, and the collective response is captured by the change in anisotropic flow $V_n$ between the two collision systems. Using a transport model, we analyze how the nonlinear coupling between lower-order flow harmonics $V_2$ and $V_3$ to the higher-order flow harmonics $V_4$ and $V_5$, expected to scale as $V_{4\mathrm{NL}}=\chi_4 V_2^2$ and $V_{5\mathrm{NL}}=\chi_5 V_2V_3$, gets modified as one moves from $^{96}$Ru+$^{96}$Ru to $^{96}$Zr+$^{96}$Zr systems. We find that these scaling relations are valid to high precision: variations of order 20% in $V_{4\mathrm{NL}}$ and $V_{5\mathrm{NL}}$ due to differences in quadrupole deformation, octupole deformation, and nuclear skin modify $\chi_{4}$ and $\chi_5$ by about 1–2%. Percent-level deviations are however larger than the expected experimental uncertainties and could be measured. Therefore, collisions of isobars with different nuclear structures are a unique tool to isolate subtle nonlinear effects in the expansion of the quark-gluon plasma that would be otherwise impossible to access in a single collision system.
Received: 14 December 2022      Published: 14 March 2023
PACS:  25.75.Gz (Particle correlations and fluctuations)  
  25.75.Ld (Collective flow)  
  25.75.-1  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/40/4/042501       OR      https://cpl.iphy.ac.cn/Y2023/V40/I4/042501
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Jiangyong Jia
Giuliano Giacalone
and Chunjian Zhang
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