Energy dependence of particle ratio fluctuations in central Pb+Pb collisions from [sqrt s [subscript NN]]=6.3 to 17.3 GeV
We present measurements of the energy dependence of event-by-event fluctuations in the K/pi and (p+p[over-bar])/pi multiplicity ratios in heavy-ion collisions at the CERN SPS. The particle ratio fluctuations were obtained for central Pb+Pb collisions at five collision energies, [sqrt s [subscript NN...
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| Format: | Article |
| Language: | en_US |
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American Physical Society
2010
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| Online Access: | http://hdl.handle.net/1721.1/54240 https://orcid.org/0000-0001-8983-2169 |
| _version_ | 1826213634032795648 |
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| author | Veres, Gabor Roland, Christof E Roland, Gunther M |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Veres, Gabor Roland, Christof E Roland, Gunther M |
| author_sort | Veres, Gabor |
| collection | MIT |
| description | We present measurements of the energy dependence of event-by-event fluctuations in the K/pi and (p+p[over-bar])/pi multiplicity ratios in heavy-ion collisions at the CERN SPS. The particle ratio fluctuations were obtained for central Pb+Pb collisions at five collision energies, [sqrt s [subscript NN]], between 6.3 and 17.3 GeV. After accounting for the effects of finite-number statistics and detector resolution, we extract the strength of nonstatistical fluctuations at each energy. For the K/pi ratio, larger fluctuations than expected for independent particle production are found at all collision energies. The fluctuations in the (p+p[over-bar])/pi ratio are smaller than expectations from independent particle production, indicating correlated pion and proton production from resonance decays. For both ratios, the deviation from purely statistical fluctuations shows an increase toward lower collision energies. The results are compared to transport model calculations, which fail to describe the energy dependence of the K/piratio fluctuations. |
| first_indexed | 2024-09-23T15:52:22Z |
| format | Article |
| id | mit-1721.1/54240 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T15:52:22Z |
| publishDate | 2010 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/542402023-02-26T04:27:28Z Energy dependence of particle ratio fluctuations in central Pb+Pb collisions from [sqrt s [subscript NN]]=6.3 to 17.3 GeV Energy dependence of particle ratio fluctuations in central Pb+Pb collisions from √sNN=6.3 to 17.3 GeV Veres, Gabor Roland, Christof E Roland, Gunther M Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Laboratory for Nuclear Science Roland, Gunther M. Veres, Gabor Roland, Christof E. Roland, Gunther M. We present measurements of the energy dependence of event-by-event fluctuations in the K/pi and (p+p[over-bar])/pi multiplicity ratios in heavy-ion collisions at the CERN SPS. The particle ratio fluctuations were obtained for central Pb+Pb collisions at five collision energies, [sqrt s [subscript NN]], between 6.3 and 17.3 GeV. After accounting for the effects of finite-number statistics and detector resolution, we extract the strength of nonstatistical fluctuations at each energy. For the K/pi ratio, larger fluctuations than expected for independent particle production are found at all collision energies. The fluctuations in the (p+p[over-bar])/pi ratio are smaller than expectations from independent particle production, indicating correlated pion and proton production from resonance decays. For both ratios, the deviation from purely statistical fluctuations shows an increase toward lower collision energies. The results are compared to transport model calculations, which fail to describe the energy dependence of the K/piratio fluctuations. Országos Tudományos Kutatási Alapprogramok (F034707) Korea Science and Engineering Foundation Grant (R01-2005-000-10334-0) Polish- German Foundation Hungarian National Science Foundation Hungarian Scientific Research Foundation (T032648, T032293, T043514) Polish State Committee for Scientific Research (1P03B 006 30, 1P03B 097 29, 1P03B 121 29, SPB/CERN/P-03.Dz 446/2002-2004, 2 P03B 04123) Bundesministerium für Bildung und Forschung, Germany United States. Dept. of Energy (Grant DE-FG03-97ER41020/A000) 2010-04-27T20:18:33Z 2010-04-27T20:18:33Z 2009-04 2008-08 Article http://purl.org/eprint/type/JournalArticle 0556-2813 http://hdl.handle.net/1721.1/54240 NA49 Collaboration et al. “Energy dependence of particle ratio fluctuations in central Pb+Pb collisions from [sqrt s [subscript NN]]=6.3 to 17.3 GeV.” Physical Review C 79.4 (2009): 044910. ©2009 The American Physical Society. https://orcid.org/0000-0001-8983-2169 en_US http://dx.doi.org/10.1103/PhysRevC.79.044910 Physical Review C Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Physical Society APS |
| spellingShingle | Veres, Gabor Roland, Christof E Roland, Gunther M Energy dependence of particle ratio fluctuations in central Pb+Pb collisions from [sqrt s [subscript NN]]=6.3 to 17.3 GeV |
| title | Energy dependence of particle ratio fluctuations in central Pb+Pb collisions from [sqrt s [subscript NN]]=6.3 to 17.3 GeV |
| title_full | Energy dependence of particle ratio fluctuations in central Pb+Pb collisions from [sqrt s [subscript NN]]=6.3 to 17.3 GeV |
| title_fullStr | Energy dependence of particle ratio fluctuations in central Pb+Pb collisions from [sqrt s [subscript NN]]=6.3 to 17.3 GeV |
| title_full_unstemmed | Energy dependence of particle ratio fluctuations in central Pb+Pb collisions from [sqrt s [subscript NN]]=6.3 to 17.3 GeV |
| title_short | Energy dependence of particle ratio fluctuations in central Pb+Pb collisions from [sqrt s [subscript NN]]=6.3 to 17.3 GeV |
| title_sort | energy dependence of particle ratio fluctuations in central pb pb collisions from sqrt s subscript nn 6 3 to 17 3 gev |
| url | http://hdl.handle.net/1721.1/54240 https://orcid.org/0000-0001-8983-2169 |
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