Investigating $^{238}$U Deformation via Dilepton Production in Relativistic Heavy-Ion Collisions
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866916861435707392 |
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| author | Zhou, Wen-Hao Liu, Lu-Meng Ko, Che Ming Sun, Kai-Jia Xu, Jun |
| author_facet | Zhou, Wen-Hao Liu, Lu-Meng Ko, Che Ming Sun, Kai-Jia Xu, Jun |
| contents | Due to their weak coupling to the strongly interacting matter produced in relativistic heavy-ion collisions, dileptons serve as a sensitive probe of the initial geometry of the colliding nuclei. In this study, we investigate the influence of initial nuclear quadrupole deformation, characterized by the parameter $β_2$, on dilepton production in $U+U$ collisions at $\sqrt{s_{NN}}=196$ GeV. The analysis is varried out using a modified multiphase transport model in which partonic interactions are described by the Nambu-Jona-Lasinio model. We observe a clear linear dependence of dilepton yields on $β_2^2$ in both the low-mass region (LMR, $<1 GeV/c^2$) and intermediate-mass region (IMR, $1-3 GeV/c^2$) of the dilepton spectrum for the most central collisions. Also, dilepton production in the IMR region exhibits a stronger sensitivity to nuclear deformation than in the LMR, reflecting the dominance of earlier partonic processes in this mass range. These results suggest that precise measurements of dilepton yields in relativistic heavy-ion collisions can provide a viable means to determine the deformation parameter $β_2$ of $^{238}$U. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2507_18189 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Investigating $^{238}$U Deformation via Dilepton Production in Relativistic Heavy-Ion Collisions Zhou, Wen-Hao Liu, Lu-Meng Ko, Che Ming Sun, Kai-Jia Xu, Jun Nuclear Theory Due to their weak coupling to the strongly interacting matter produced in relativistic heavy-ion collisions, dileptons serve as a sensitive probe of the initial geometry of the colliding nuclei. In this study, we investigate the influence of initial nuclear quadrupole deformation, characterized by the parameter $β_2$, on dilepton production in $U+U$ collisions at $\sqrt{s_{NN}}=196$ GeV. The analysis is varried out using a modified multiphase transport model in which partonic interactions are described by the Nambu-Jona-Lasinio model. We observe a clear linear dependence of dilepton yields on $β_2^2$ in both the low-mass region (LMR, $<1 GeV/c^2$) and intermediate-mass region (IMR, $1-3 GeV/c^2$) of the dilepton spectrum for the most central collisions. Also, dilepton production in the IMR region exhibits a stronger sensitivity to nuclear deformation than in the LMR, reflecting the dominance of earlier partonic processes in this mass range. These results suggest that precise measurements of dilepton yields in relativistic heavy-ion collisions can provide a viable means to determine the deformation parameter $β_2$ of $^{238}$U. |
| title | Investigating $^{238}$U Deformation via Dilepton Production in Relativistic Heavy-Ion Collisions |
| topic | Nuclear Theory |
| url | https://arxiv.org/abs/2507.18189 |