Anti-flow of Mesons in the High Baryon Density Region
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arXiv
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| Format: | Preprint |
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2024
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| author | Liu, Zuo-Wen Shi, Shusu |
| author_facet | Liu, Zuo-Wen Shi, Shusu |
| contents | The E895 and STAR experiments demonstrate that the slopes of directed flow with respect to rapidity ($dv_1/dy|_{y=0}$) of mesons are negative in the low transverse momentum ($p_T$) region, $p_T < 0.8$ GeV/$c$, in Au + Au collisions at $\sqrt{s_{NN}} = 3.0 - 3.9$ GeV. Using the transport model JAM, we investigate the directed flow of $π^{\pm}$, $K^{\pm}$, and $K^0$ as functions of rapidity, $p_T$, and collision energy in Au + Au collisions at the same energies as those in the E895 and STAR experiments. We find that the JAM model can qualitatively reproduce the anti-flow of $K^0_S$ observed in the E895 experiment. The $v_1$ slopes of pions and kaons are analyzed as functions of the $p_T$ window, revealing a strong $p_T$ dependence of the $v_1$ slopes. Negative $v_1$ slopes are observed in the low $p_T$ region, $p_T < 0.8$ GeV/$c$, while positive slopes are shown in the higher $p_T$ region. We find that the shadowing effect from spectators is crucial in generating the anti-flow of mesons at low $p_T$ in the high baryon density region. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_07563 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Anti-flow of Mesons in the High Baryon Density Region Liu, Zuo-Wen Shi, Shusu Nuclear Theory Nuclear Experiment The E895 and STAR experiments demonstrate that the slopes of directed flow with respect to rapidity ($dv_1/dy|_{y=0}$) of mesons are negative in the low transverse momentum ($p_T$) region, $p_T < 0.8$ GeV/$c$, in Au + Au collisions at $\sqrt{s_{NN}} = 3.0 - 3.9$ GeV. Using the transport model JAM, we investigate the directed flow of $π^{\pm}$, $K^{\pm}$, and $K^0$ as functions of rapidity, $p_T$, and collision energy in Au + Au collisions at the same energies as those in the E895 and STAR experiments. We find that the JAM model can qualitatively reproduce the anti-flow of $K^0_S$ observed in the E895 experiment. The $v_1$ slopes of pions and kaons are analyzed as functions of the $p_T$ window, revealing a strong $p_T$ dependence of the $v_1$ slopes. Negative $v_1$ slopes are observed in the low $p_T$ region, $p_T < 0.8$ GeV/$c$, while positive slopes are shown in the higher $p_T$ region. We find that the shadowing effect from spectators is crucial in generating the anti-flow of mesons at low $p_T$ in the high baryon density region. |
| title | Anti-flow of Mesons in the High Baryon Density Region |
| topic | Nuclear Theory Nuclear Experiment |
| url | https://arxiv.org/abs/2408.07563 |