Proton cumulants and correlation functions in Au + Au collisions at sNN=7.7–200 GeV from UrQMD model
We studied the acceptance dependence of proton cumulants (up to fourth order) and correlation functions in 0–5% most central Au+Au collisions at sNN=7.7, 11.5, 19.6, 27, 39, 62.4 and 200 GeV from UrQMD model. We found that high order proton cumulants show suppressions at large acceptance. By decompo...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Elsevier
2017-11-01
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| Series: | Physics Letters B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269317308420 |
| _version_ | 1819017974830333952 |
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| author | Shu He Xiaofeng Luo |
| author_facet | Shu He Xiaofeng Luo |
| author_sort | Shu He |
| collection | DOAJ |
| description | We studied the acceptance dependence of proton cumulants (up to fourth order) and correlation functions in 0–5% most central Au+Au collisions at sNN=7.7, 11.5, 19.6, 27, 39, 62.4 and 200 GeV from UrQMD model. We found that high order proton cumulants show suppressions at large acceptance. By decomposing the proton cumulants into linear combination of multi-proton correlation functions, we observed the two-proton correlation functions always show negative values due to the effects of baryon number conservations. The three and four-proton correlation functions are close to zero and show negligible acceptance dependence. We further observed that the proton cumulants and correlation functions follow similar trends and show a scaling behavior when plotting the results versus mean number of protons. The comparisons between experimental data and the UrQMD calculations show that the non-monotonic energy dependence of proton correlation functions measured by STAR experiment cannot be described by the UrQMD model. The UrQMD calculations can provide us baselines for the experimental studies of the proton cumulants and correlation functions. Finally, we propose to measure the rapidity dependence of the reduced proton correlation functions to search for the QCD critical point in heavy-ion collisions. |
| first_indexed | 2024-12-21T03:12:03Z |
| format | Article |
| id | doaj.art-97079c5e5c8a4c71a15cec450f23ef79 |
| institution | Directory Open Access Journal |
| issn | 0370-2693 1873-2445 |
| language | English |
| last_indexed | 2024-12-21T03:12:03Z |
| publishDate | 2017-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics Letters B |
| spelling | doaj.art-97079c5e5c8a4c71a15cec450f23ef792022-12-21T19:17:57ZengElsevierPhysics Letters B0370-26931873-24452017-11-01774C62362910.1016/j.physletb.2017.10.030Proton cumulants and correlation functions in Au + Au collisions at sNN=7.7–200 GeV from UrQMD modelShu He0Xiaofeng Luo1Key Laboratory of Quark & Lepton Physics (MOE) and Institute of Particle Physics, Central China Normal University, Wuhan 430079, ChinaKey Laboratory of Quark & Lepton Physics (MOE) and Institute of Particle Physics, Central China Normal University, Wuhan 430079, ChinaWe studied the acceptance dependence of proton cumulants (up to fourth order) and correlation functions in 0–5% most central Au+Au collisions at sNN=7.7, 11.5, 19.6, 27, 39, 62.4 and 200 GeV from UrQMD model. We found that high order proton cumulants show suppressions at large acceptance. By decomposing the proton cumulants into linear combination of multi-proton correlation functions, we observed the two-proton correlation functions always show negative values due to the effects of baryon number conservations. The three and four-proton correlation functions are close to zero and show negligible acceptance dependence. We further observed that the proton cumulants and correlation functions follow similar trends and show a scaling behavior when plotting the results versus mean number of protons. The comparisons between experimental data and the UrQMD calculations show that the non-monotonic energy dependence of proton correlation functions measured by STAR experiment cannot be described by the UrQMD model. The UrQMD calculations can provide us baselines for the experimental studies of the proton cumulants and correlation functions. Finally, we propose to measure the rapidity dependence of the reduced proton correlation functions to search for the QCD critical point in heavy-ion collisions.http://www.sciencedirect.com/science/article/pii/S0370269317308420 |
| spellingShingle | Shu He Xiaofeng Luo Proton cumulants and correlation functions in Au + Au collisions at sNN=7.7–200 GeV from UrQMD model Physics Letters B |
| title | Proton cumulants and correlation functions in Au + Au collisions at sNN=7.7–200 GeV from UrQMD model |
| title_full | Proton cumulants and correlation functions in Au + Au collisions at sNN=7.7–200 GeV from UrQMD model |
| title_fullStr | Proton cumulants and correlation functions in Au + Au collisions at sNN=7.7–200 GeV from UrQMD model |
| title_full_unstemmed | Proton cumulants and correlation functions in Au + Au collisions at sNN=7.7–200 GeV from UrQMD model |
| title_short | Proton cumulants and correlation functions in Au + Au collisions at sNN=7.7–200 GeV from UrQMD model |
| title_sort | proton cumulants and correlation functions in au au collisions at snn 7 7 200 gev from urqmd model |
| url | http://www.sciencedirect.com/science/article/pii/S0370269317308420 |
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