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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2408.06581 |
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| _version_ | 1866912075828166656 |
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| author | Xu, Kun Huang, Mei |
| author_facet | Xu, Kun Huang, Mei |
| contents | We propose a novel mechanism that the spin alignment of vector meson $ϕ$ and $K^{*0}$ in most central heavy ion collisions is induced by intrinsic QCD dynamics without external vortical/ magnetic fields. The local spin density fluctuation of quarks due to the axial-vector and tensor interactions between quarks can induce the spin alignments of vector meson. It is found that axial-vector interaction results in $ρ_{00}<1/3$ for the spin alignment of $ϕ$ meson, while tensor interaction results in $ρ_{00}>1/3$. We argue that the spin alignment of $K^{*0}$ due to the spin density fluctuation from flavor-mixing would be a signature or hint of instanton. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_06581 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Spin Alignment of Vector Mesons Induced by Local Spin Density Fluctuations Xu, Kun Huang, Mei High Energy Physics - Phenomenology We propose a novel mechanism that the spin alignment of vector meson $ϕ$ and $K^{*0}$ in most central heavy ion collisions is induced by intrinsic QCD dynamics without external vortical/ magnetic fields. The local spin density fluctuation of quarks due to the axial-vector and tensor interactions between quarks can induce the spin alignments of vector meson. It is found that axial-vector interaction results in $ρ_{00}<1/3$ for the spin alignment of $ϕ$ meson, while tensor interaction results in $ρ_{00}>1/3$. We argue that the spin alignment of $K^{*0}$ due to the spin density fluctuation from flavor-mixing would be a signature or hint of instanton. |
| title | Spin Alignment of Vector Mesons Induced by Local Spin Density Fluctuations |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2408.06581 |