Measurements of global and local spin polarization of $Λ$ and $\barΛ$ in Au+Au collisions from the RHIC Beam Energy Scan
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arXiv
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866916521654091776 |
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| author | Hu, Q. |
| author_facet | Hu, Q. |
| contents | We report the measurements of $Λ$ hyperons' global and local spin polarization from second phase of the RHIC Beam Energy Scan (BES-II) in Au+Au collisions at $\sqrt{s_{NN}}$= 7.7--27 GeV. Global polarization measurements of $\barΛ$ and $Λ$ show no significant differences, offering insights into the late-stage evolution of the magnetic field. The new measurements of the local polarization of $Λ$ perpendicular to the reaction plane ($\langle P_{2,y} \rangle$) shows a monotonic increase with decreasing collision energy, while the component along the beam direction ($\langle P_{2,z} \rangle$) for both $Λ$ and $\barΛ$ is small in magnitude with no strong energy dependence. The net local polarization observable, $\langle P_{2,y}^{net} \rangle =\langle P_{2,y}(Λ) \rangle - \langle P_{2,y}(\barΛ)\rangle$ and $\langle P_{2,z}^{net} \rangle = \langle P_{2,z}(Λ) \rangle - \langle P_{2,z}(\barΛ \rangle)$ designed to probe baryonic spin Hall effect, is consistent with zero with large uncertainty. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_09897 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Measurements of global and local spin polarization of $Λ$ and $\barΛ$ in Au+Au collisions from the RHIC Beam Energy Scan Hu, Q. Nuclear Experiment High Energy Physics - Experiment We report the measurements of $Λ$ hyperons' global and local spin polarization from second phase of the RHIC Beam Energy Scan (BES-II) in Au+Au collisions at $\sqrt{s_{NN}}$= 7.7--27 GeV. Global polarization measurements of $\barΛ$ and $Λ$ show no significant differences, offering insights into the late-stage evolution of the magnetic field. The new measurements of the local polarization of $Λ$ perpendicular to the reaction plane ($\langle P_{2,y} \rangle$) shows a monotonic increase with decreasing collision energy, while the component along the beam direction ($\langle P_{2,z} \rangle$) for both $Λ$ and $\barΛ$ is small in magnitude with no strong energy dependence. The net local polarization observable, $\langle P_{2,y}^{net} \rangle =\langle P_{2,y}(Λ) \rangle - \langle P_{2,y}(\barΛ)\rangle$ and $\langle P_{2,z}^{net} \rangle = \langle P_{2,z}(Λ) \rangle - \langle P_{2,z}(\barΛ \rangle)$ designed to probe baryonic spin Hall effect, is consistent with zero with large uncertainty. |
| title | Measurements of global and local spin polarization of $Λ$ and $\barΛ$ in Au+Au collisions from the RHIC Beam Energy Scan |
| topic | Nuclear Experiment High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2412.09897 |