Net proton number cumulants from viscous hydro with equation of state including a critical end point
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866913297059545088 |
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| author | Shen, Yi-fan Chen, Wei Wu, Xiang-yu Xu, Kun Huang, Mei |
| author_facet | Shen, Yi-fan Chen, Wei Wu, Xiang-yu Xu, Kun Huang, Mei |
| contents | In the SMASH-CLVisc-hybrid framework, including SMASH for the initial conditions and the hadronic rescattering stage, and CLVisc for the quark gluon plasma (QGP) evolution, we investigate net baryon number fluctuations via considering the equation of state (EoS) with and without a critical end point (CEP) in the QCD phase transition. Specifically, two distinct QCD EoS are utilized: one with smooth crossover derived from NEOS and another with a critical end point sourced from the rPNJL model. Our results show that non-monotonic behavior of $κσ^2$ is not observed above the collision energy $7.7 {\rm GeV}$, nor are there explicit differences between the EoS characterized by crossover and that by CEP. This could be attributed to the significant deviation of the freeze-out line from the location of CEP. It is also found that the pure SMASH result of $κσ^2$ is positive and close to zero at 3 GeV, which is different from the negative value observed from STAR. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2404_02397 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Net proton number cumulants from viscous hydro with equation of state including a critical end point Shen, Yi-fan Chen, Wei Wu, Xiang-yu Xu, Kun Huang, Mei High Energy Physics - Phenomenology Nuclear Theory In the SMASH-CLVisc-hybrid framework, including SMASH for the initial conditions and the hadronic rescattering stage, and CLVisc for the quark gluon plasma (QGP) evolution, we investigate net baryon number fluctuations via considering the equation of state (EoS) with and without a critical end point (CEP) in the QCD phase transition. Specifically, two distinct QCD EoS are utilized: one with smooth crossover derived from NEOS and another with a critical end point sourced from the rPNJL model. Our results show that non-monotonic behavior of $κσ^2$ is not observed above the collision energy $7.7 {\rm GeV}$, nor are there explicit differences between the EoS characterized by crossover and that by CEP. This could be attributed to the significant deviation of the freeze-out line from the location of CEP. It is also found that the pure SMASH result of $κσ^2$ is positive and close to zero at 3 GeV, which is different from the negative value observed from STAR. |
| title | Net proton number cumulants from viscous hydro with equation of state including a critical end point |
| topic | High Energy Physics - Phenomenology Nuclear Theory |
| url | https://arxiv.org/abs/2404.02397 |