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| Main Author: | |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2411.12101 |
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| _version_ | 1866916007510016000 |
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| author | The STAR Collaboration |
| author_facet | The STAR Collaboration |
| contents | The correlation between the mean transverse momentum, $[p_{\mathrm{T}}]$, and the squared anisotropic flow, $v^{2}_{n}$, on an event-by-event basis has been suggested to be influenced by the initial conditions in heavy-ion collisions. We present measurements of the variances and covariance of $[p_{\mathrm{T}}]$ and $v^{2}_{n}$, along with their dimensionless ratio, for Au+Au collisions at various beam energies: $\sqrt{\textit{s}_{NN}}$ $=$ 14.6, 19.6, 27, 54.4, and 200~GeV. Our measurements reveal a distinct energy-dependent behavior in the variances and covariances. In addition, the dimensionless ratio displays a similar behavior across different beam energies. We compare our measurements with hydrodynamic models and similar measurements from Pb+Pb collisions at the Large Hadron Collider (LHC). These findings provide valuable insights into the beam energy dependence of the specific shear viscosity ($η/s$) and initial-state effects, allowing for differentiating between different initial-state models. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_12101 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Beam-energy dependence of correlations between mean transverse momentum and anisotropic flow of charged particles in Au+Au collisions at RHIC The STAR Collaboration Nuclear Experiment The correlation between the mean transverse momentum, $[p_{\mathrm{T}}]$, and the squared anisotropic flow, $v^{2}_{n}$, on an event-by-event basis has been suggested to be influenced by the initial conditions in heavy-ion collisions. We present measurements of the variances and covariance of $[p_{\mathrm{T}}]$ and $v^{2}_{n}$, along with their dimensionless ratio, for Au+Au collisions at various beam energies: $\sqrt{\textit{s}_{NN}}$ $=$ 14.6, 19.6, 27, 54.4, and 200~GeV. Our measurements reveal a distinct energy-dependent behavior in the variances and covariances. In addition, the dimensionless ratio displays a similar behavior across different beam energies. We compare our measurements with hydrodynamic models and similar measurements from Pb+Pb collisions at the Large Hadron Collider (LHC). These findings provide valuable insights into the beam energy dependence of the specific shear viscosity ($η/s$) and initial-state effects, allowing for differentiating between different initial-state models. |
| title | Beam-energy dependence of correlations between mean transverse momentum and anisotropic flow of charged particles in Au+Au collisions at RHIC |
| topic | Nuclear Experiment |
| url | https://arxiv.org/abs/2411.12101 |