Holographic spin alignment for vector mesons
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arXiv
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| Autores principales: | , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| Materias: | |
| Acceso en línea: | |
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| _version_ | 1866911793606033408 |
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| author | Sheng, Xin-Li Zhao, Yan-Qing Li, Si-Wen Becattini, Francesco Hou, Defu |
| author_facet | Sheng, Xin-Li Zhao, Yan-Qing Li, Si-Wen Becattini, Francesco Hou, Defu |
| contents | We develop a general framework for studying the spin alignment $ρ_{00}$ for flavorless vector mesons by using the gauge/gravity duality. Focusing on the dilepton production through vector meson decay, we derive the relation between production rates at each spin channel and meson's spectral function, which can be evaluated by holographic models for a strongly coupled system. As examples, we study $ρ_{00}$ for $J/ψ$ and $ϕ$ mesons, induced by the relative motion to a thermal background, within the soft-wall model. We show that $ρ_{00}$ in the helicity frame for $J/ψ$ and $ϕ$ mesons have positive and negative deviations from 1/3 at $T=150$ MeV, respectively, which consequently leads to different properties for their global spin alignments. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_07522 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Holographic spin alignment for vector mesons Sheng, Xin-Li Zhao, Yan-Qing Li, Si-Wen Becattini, Francesco Hou, Defu High Energy Physics - Phenomenology High Energy Physics - Theory Nuclear Theory We develop a general framework for studying the spin alignment $ρ_{00}$ for flavorless vector mesons by using the gauge/gravity duality. Focusing on the dilepton production through vector meson decay, we derive the relation between production rates at each spin channel and meson's spectral function, which can be evaluated by holographic models for a strongly coupled system. As examples, we study $ρ_{00}$ for $J/ψ$ and $ϕ$ mesons, induced by the relative motion to a thermal background, within the soft-wall model. We show that $ρ_{00}$ in the helicity frame for $J/ψ$ and $ϕ$ mesons have positive and negative deviations from 1/3 at $T=150$ MeV, respectively, which consequently leads to different properties for their global spin alignments. |
| title | Holographic spin alignment for vector mesons |
| topic | High Energy Physics - Phenomenology High Energy Physics - Theory Nuclear Theory |
| url | https://arxiv.org/abs/2403.07522 |