The time evolution of light nuclei cumulants and ratios with a first-order phase transition in the UrQMD transport model
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866916791449550848 |
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| author | Bumnedpan, Thiranat Steinheimer, Jan Reichert, Tom Herold, Christoph Limphirat, Ayut Bleicher, Marcus |
| author_facet | Bumnedpan, Thiranat Steinheimer, Jan Reichert, Tom Herold, Christoph Limphirat, Ayut Bleicher, Marcus |
| contents | The UrQMD model with a density dependent equation of state, including a first-order phase transition, is used to study the time dependence of baryon number and proton number susceptibilities up to third order in heavy ion reactions of $E_{\mathrm{lab}}=2-3 A$ GeV. A significant deviation from the Gaussian fluctuations of the baryon number fluctuation in coordinate space is observed. The proton number fluctuations are always suppressed as they constitute only a small fraction of the total baryon number during the dense phase of the collision. It is found that the only measurable, but small, signal would be an enhancement of the third order (or higher) proton cumulant in a finite rapidity window $Δy$ that is larger than one unit of rapidity. In addition, it is found that the coordinate fluctuations will lead to an enhancement of cluster production due to the correlations in coordinate space. However, this enhancement is small and mainly occurs during the dense part of the collision before the system actually freezes out. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2411_08444 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The time evolution of light nuclei cumulants and ratios with a first-order phase transition in the UrQMD transport model Bumnedpan, Thiranat Steinheimer, Jan Reichert, Tom Herold, Christoph Limphirat, Ayut Bleicher, Marcus High Energy Physics - Phenomenology Nuclear Theory The UrQMD model with a density dependent equation of state, including a first-order phase transition, is used to study the time dependence of baryon number and proton number susceptibilities up to third order in heavy ion reactions of $E_{\mathrm{lab}}=2-3 A$ GeV. A significant deviation from the Gaussian fluctuations of the baryon number fluctuation in coordinate space is observed. The proton number fluctuations are always suppressed as they constitute only a small fraction of the total baryon number during the dense phase of the collision. It is found that the only measurable, but small, signal would be an enhancement of the third order (or higher) proton cumulant in a finite rapidity window $Δy$ that is larger than one unit of rapidity. In addition, it is found that the coordinate fluctuations will lead to an enhancement of cluster production due to the correlations in coordinate space. However, this enhancement is small and mainly occurs during the dense part of the collision before the system actually freezes out. |
| title | The time evolution of light nuclei cumulants and ratios with a first-order phase transition in the UrQMD transport model |
| topic | High Energy Physics - Phenomenology Nuclear Theory |
| url | https://arxiv.org/abs/2411.08444 |