Hyperon spin correlation in high-energy heavy-ion collisions
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866912763481161728 |
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| author | Sheng, Xin-Li Wu, Xiang-Yu Rischke, Dirk H. Wang, Xin-Nian |
| author_facet | Sheng, Xin-Li Wu, Xiang-Yu Rischke, Dirk H. Wang, Xin-Nian |
| contents | Recent experimental data show an unexpectedly large spin alignment of $ϕ$ mesons in high-energy heavy-ion collisions, which can be explained by short-distance fluctuations of strong-force fields (vector $ϕ$ fields) within the constituent-quark model. We calculate the hyperon spin correlations within the same model, taking into account hydrodynamic effects and a $ϕ$ field fluctuating in space-time according to a Gaussian distribution. The $Λ\barΛ$ spin correlation induced by the $ϕ$ field is shown to be negative as opposed to that of $ΛΛ$ or $\barΛ\barΛ$. We thus propose a new net spin-correlation observable as a sensitive probe to separate strong-force effects from hydrodynamic ones. With the strength of the field fluctuations extracted from the observed $ϕ$ spin alignment, we predict the collision-energy dependence of the hyperon spin correlations and also investigate the dependence of the net spin correlation on azimuthal-angle and rapidity difference. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_03496 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Hyperon spin correlation in high-energy heavy-ion collisions Sheng, Xin-Li Wu, Xiang-Yu Rischke, Dirk H. Wang, Xin-Nian High Energy Physics - Phenomenology Nuclear Theory Recent experimental data show an unexpectedly large spin alignment of $ϕ$ mesons in high-energy heavy-ion collisions, which can be explained by short-distance fluctuations of strong-force fields (vector $ϕ$ fields) within the constituent-quark model. We calculate the hyperon spin correlations within the same model, taking into account hydrodynamic effects and a $ϕ$ field fluctuating in space-time according to a Gaussian distribution. The $Λ\barΛ$ spin correlation induced by the $ϕ$ field is shown to be negative as opposed to that of $ΛΛ$ or $\barΛ\barΛ$. We thus propose a new net spin-correlation observable as a sensitive probe to separate strong-force effects from hydrodynamic ones. With the strength of the field fluctuations extracted from the observed $ϕ$ spin alignment, we predict the collision-energy dependence of the hyperon spin correlations and also investigate the dependence of the net spin correlation on azimuthal-angle and rapidity difference. |
| title | Hyperon spin correlation in high-energy heavy-ion collisions |
| topic | High Energy Physics - Phenomenology Nuclear Theory |
| url | https://arxiv.org/abs/2508.03496 |