Hydrodynamic effects on spin polarization along the beam direction in Au+Au and p+Pb collisions
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866912560181149696 |
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| author | Yi, Cong Wu, Xiang-Yu Zhu, Jie Pu, Shi Qin, Guang-You |
| author_facet | Yi, Cong Wu, Xiang-Yu Zhu, Jie Pu, Shi Qin, Guang-You |
| contents | We investigate hydrodynamic effects on the spin polarization of $Λ$ hyperons in Au+Au collisions at $\sqrt{s_{NN}} = 200$ GeV and p+Pb collisions at $\sqrt{s_{NN}} = 8.16$ TeV using the CLVisc hydrodynamic framework. We present numerical results for the second Fourier sine coefficient of the longitudinal spin polarization, $\langle P_{z} \sin 2(ϕ_{p} - Ψ_{2}) \rangle$, as a function of multiplicity (centrality) under three equilibrium scenarios: $Λ$ equilibrium, $s$-quark equilibrium, and isothermal equilibrium. We highlight the respective roles of thermal vorticity and the thermal-shear tensor in generating $\langle P_{z} \sin 2(ϕ_{p} - Ψ_{2}) \rangle$ across collision systems and scenarios. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_00380 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Hydrodynamic effects on spin polarization along the beam direction in Au+Au and p+Pb collisions Yi, Cong Wu, Xiang-Yu Zhu, Jie Pu, Shi Qin, Guang-You Nuclear Theory We investigate hydrodynamic effects on the spin polarization of $Λ$ hyperons in Au+Au collisions at $\sqrt{s_{NN}} = 200$ GeV and p+Pb collisions at $\sqrt{s_{NN}} = 8.16$ TeV using the CLVisc hydrodynamic framework. We present numerical results for the second Fourier sine coefficient of the longitudinal spin polarization, $\langle P_{z} \sin 2(ϕ_{p} - Ψ_{2}) \rangle$, as a function of multiplicity (centrality) under three equilibrium scenarios: $Λ$ equilibrium, $s$-quark equilibrium, and isothermal equilibrium. We highlight the respective roles of thermal vorticity and the thermal-shear tensor in generating $\langle P_{z} \sin 2(ϕ_{p} - Ψ_{2}) \rangle$ across collision systems and scenarios. |
| title | Hydrodynamic effects on spin polarization along the beam direction in Au+Au and p+Pb collisions |
| topic | Nuclear Theory |
| url | https://arxiv.org/abs/2509.00380 |