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| Main Author: | |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2604.25165 |
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Table of Contents:
- The anisotropic emission of direct photons from Au+Au collisions at $\sqrt{s_{NN}}$=200 GeV was calculated using a (3+1)-dimensional viscous hydrodynamic model with the impact parameter Glasma initial condition. The transverse momentum spectra of direct photons in different centrality bins (0-20\%, 20-40\%, and 40-60\%) are in good agreement with experimental data measured at RHIC. For the elliptic flow $v_{2}$ and triangular flow $v_{3}$, the agreement is centrality dependent, showing good correspondence for the 20-40\% bin but underprediction for the 0-20\% bin and overprediction for the 40-60\% bin. After carefully accounting for the contribution from prompt photons, the measured $v_{2}$ of direct photons is no longer too large to explain. An overestimation of the prompt photon yield can suppress the $v_2$ and $v_3$ of direct photons to values lower than those observed in the experimental data.