Exploring critical fluctuation phenomenon according to net-proton multiplicity information entropy in AMPT model
Information entropy can be used for investigating the critical fluctuation phenomenon by describing multiplicity fluctuations in heavy-ion collisions. In this study, a multiphase transport (AMPT) model in the default version (AMPT-DEF) and with the string melting (AMPT-SM) were used as event generat...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-06-01
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| Series: | Physics Letters B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269323002435 |
| _version_ | 1797822156985335808 |
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| author | Jie Pu Yong-Bo Yu Kai-Xuan Cheng Yu-Ting Wang Ya-Fei Guo Chun-Wang Ma |
| author_facet | Jie Pu Yong-Bo Yu Kai-Xuan Cheng Yu-Ting Wang Ya-Fei Guo Chun-Wang Ma |
| author_sort | Jie Pu |
| collection | DOAJ |
| description | Information entropy can be used for investigating the critical fluctuation phenomenon by describing multiplicity fluctuations in heavy-ion collisions. In this study, a multiphase transport (AMPT) model in the default version (AMPT-DEF) and with the string melting (AMPT-SM) were used as event generators to simulate the Au+Au reaction at different incident energies. Owing to the influence of the distribution bin number in extracting its information entropy, two methods, i.e., data binning and weighting factors, were proposed to correct the information entropy analysis. The comparison between information entropy and kurtosis also reflects the necessity to correct the information entropy analysis. The corrected information entropy of net-proton multiplicity was analyzed in central Au+Au collisions at sNN= 4.7, 6.4, 7.7, 8.8, 11.5, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 140, 170, and 200 GeV with the impact parameter b=3 fm. The results indicated that the fluctuations of net-proton multiplicity were essentially identical at collision energies ranging from sNN= 4.7 GeV to sNN= 200 GeV in the same model. No critical fluctuation phenomenon was found in the central Au+Au collisions simulated using the AMPT models, similar to the case of the AMPT model, which does not have. Comparing the information entropy of AMPT-SM to AMPT-DEF, the effect of partonic phase leads to a bigger fluctuation, indicating that the corrected information entropy can be a useful probe to explore the phase transition. The mid-rapidity net-proton multiplicity information entropy was also calculated, and the results led to the same conclusion. The corrected information entropy may be useful for investigating critical fluctuations, which is important for exploring critical endpoint. |
| first_indexed | 2024-03-13T10:03:43Z |
| format | Article |
| id | doaj.art-e443842bf2b8477f9879c4a8c926a213 |
| institution | Directory Open Access Journal |
| issn | 0370-2693 |
| language | English |
| last_indexed | 2024-03-13T10:03:43Z |
| publishDate | 2023-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics Letters B |
| spelling | doaj.art-e443842bf2b8477f9879c4a8c926a2132023-05-23T04:20:43ZengElsevierPhysics Letters B0370-26932023-06-01841137909Exploring critical fluctuation phenomenon according to net-proton multiplicity information entropy in AMPT modelJie Pu0Yong-Bo Yu1Kai-Xuan Cheng2Yu-Ting Wang3Ya-Fei Guo4Chun-Wang Ma5Corresponding authors.; College of Physics, Henan Normal University, Xinxiang 453007, ChinaCollege of Physics, Henan Normal University, Xinxiang 453007, ChinaCollege of Physics, Henan Normal University, Xinxiang 453007, ChinaCollege of Physics, Henan Normal University, Xinxiang 453007, ChinaCollege of Physics, Henan Normal University, Xinxiang 453007, ChinaCorresponding authors.; College of Physics, Henan Normal University, Xinxiang 453007, ChinaInformation entropy can be used for investigating the critical fluctuation phenomenon by describing multiplicity fluctuations in heavy-ion collisions. In this study, a multiphase transport (AMPT) model in the default version (AMPT-DEF) and with the string melting (AMPT-SM) were used as event generators to simulate the Au+Au reaction at different incident energies. Owing to the influence of the distribution bin number in extracting its information entropy, two methods, i.e., data binning and weighting factors, were proposed to correct the information entropy analysis. The comparison between information entropy and kurtosis also reflects the necessity to correct the information entropy analysis. The corrected information entropy of net-proton multiplicity was analyzed in central Au+Au collisions at sNN= 4.7, 6.4, 7.7, 8.8, 11.5, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 140, 170, and 200 GeV with the impact parameter b=3 fm. The results indicated that the fluctuations of net-proton multiplicity were essentially identical at collision energies ranging from sNN= 4.7 GeV to sNN= 200 GeV in the same model. No critical fluctuation phenomenon was found in the central Au+Au collisions simulated using the AMPT models, similar to the case of the AMPT model, which does not have. Comparing the information entropy of AMPT-SM to AMPT-DEF, the effect of partonic phase leads to a bigger fluctuation, indicating that the corrected information entropy can be a useful probe to explore the phase transition. The mid-rapidity net-proton multiplicity information entropy was also calculated, and the results led to the same conclusion. The corrected information entropy may be useful for investigating critical fluctuations, which is important for exploring critical endpoint.http://www.sciencedirect.com/science/article/pii/S0370269323002435 |
| spellingShingle | Jie Pu Yong-Bo Yu Kai-Xuan Cheng Yu-Ting Wang Ya-Fei Guo Chun-Wang Ma Exploring critical fluctuation phenomenon according to net-proton multiplicity information entropy in AMPT model Physics Letters B |
| title | Exploring critical fluctuation phenomenon according to net-proton multiplicity information entropy in AMPT model |
| title_full | Exploring critical fluctuation phenomenon according to net-proton multiplicity information entropy in AMPT model |
| title_fullStr | Exploring critical fluctuation phenomenon according to net-proton multiplicity information entropy in AMPT model |
| title_full_unstemmed | Exploring critical fluctuation phenomenon according to net-proton multiplicity information entropy in AMPT model |
| title_short | Exploring critical fluctuation phenomenon according to net-proton multiplicity information entropy in AMPT model |
| title_sort | exploring critical fluctuation phenomenon according to net proton multiplicity information entropy in ampt model |
| url | http://www.sciencedirect.com/science/article/pii/S0370269323002435 |
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