Hyperon longitudinal polarization and vector meson spin alignment in a thermal model for heavy-ion collisions
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arXiv
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| Hauptverfasser: | , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866912913572233216 |
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| author | Banerjee, Soham Bhadury, Samapan Florkowski, Wojciech Jaiswal, Amaresh Ryblewski, Radoslaw |
| author_facet | Banerjee, Soham Bhadury, Samapan Florkowski, Wojciech Jaiswal, Amaresh Ryblewski, Radoslaw |
| contents | The concept of a common local spin equilibrium for both spin-1/2 and spin-1 particles is incorporated into a thermal model of particle production in heavy-ion collisions at the top RHIC energies. We show that an effective spin polarization tensor leading to a correct description of the longitudinal spin polarization of $Λ$ hyperons simultaneously yields a positive alignment of vector mesons ($ϕ$ and $K^{*0}$) that grows monotonically with transverse momentum and centrality. Similar trends can be seen in the data, suggesting a possible common mechanism for longitudinal spin polarization and alignment. However, model calculations are insufficient to explain the data in a fully quantitative way. The correlation found between the magnitude of the $Λ$ longitudinal polarization and vector meson alignment suggests further more elaborate investigations of this issue. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_17500 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Hyperon longitudinal polarization and vector meson spin alignment in a thermal model for heavy-ion collisions Banerjee, Soham Bhadury, Samapan Florkowski, Wojciech Jaiswal, Amaresh Ryblewski, Radoslaw High Energy Physics - Phenomenology High Energy Physics - Theory Nuclear Theory The concept of a common local spin equilibrium for both spin-1/2 and spin-1 particles is incorporated into a thermal model of particle production in heavy-ion collisions at the top RHIC energies. We show that an effective spin polarization tensor leading to a correct description of the longitudinal spin polarization of $Λ$ hyperons simultaneously yields a positive alignment of vector mesons ($ϕ$ and $K^{*0}$) that grows monotonically with transverse momentum and centrality. Similar trends can be seen in the data, suggesting a possible common mechanism for longitudinal spin polarization and alignment. However, model calculations are insufficient to explain the data in a fully quantitative way. The correlation found between the magnitude of the $Λ$ longitudinal polarization and vector meson alignment suggests further more elaborate investigations of this issue. |
| title | Hyperon longitudinal polarization and vector meson spin alignment in a thermal model for heavy-ion collisions |
| topic | High Energy Physics - Phenomenology High Energy Physics - Theory Nuclear Theory |
| url | https://arxiv.org/abs/2602.17500 |