Center of mass energy and system-size dependence of photon production at forward rapidity at RHIC
We present the multiplicity and pseudorapidity distributions of photons produced in Au + Au and Cu + Cu collisions at √s[subscript NN] = 62.4 and 200 GeV. The photons are measured in the region - 3.7 < η < - 2.3 using the photon multiplicity detector in the STAR experiment at RHIC. The number...
| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier BV
2019
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| Online Access: | https://hdl.handle.net/1721.1/121380 |
| _version_ | 1810973671496351744 |
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| author | Betancourt, Michael Joseph Corliss, Ross Cameron Hoffman, Alan Michael Jones, C. L. Kocoloski, Adam Philip Leight, William Axel Millner, R. Redwine, Robert P Sakuma, Tai Surrow, Bernd STAR Collaboration |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Betancourt, Michael Joseph Corliss, Ross Cameron Hoffman, Alan Michael Jones, C. L. Kocoloski, Adam Philip Leight, William Axel Millner, R. Redwine, Robert P Sakuma, Tai Surrow, Bernd STAR Collaboration |
| author_sort | Betancourt, Michael Joseph |
| collection | MIT |
| description | We present the multiplicity and pseudorapidity distributions of photons produced in Au + Au and Cu + Cu collisions at √s[subscript NN] = 62.4 and 200 GeV. The photons are measured in the region - 3.7 < η < - 2.3 using the photon multiplicity detector in the STAR experiment at RHIC. The number of photons produced per average number of participating nucleon pairs increases with the beam energy and is independent of the collision centrality. For collisions with similar average numbers of participating nucleons the photon multiplicities are observed to be similar for Au + Au and Cu + Cu collisions at a given beam energy. The ratios of the number of charged particles to photons in the measured pseudorapidity range are found to be 1.4 ± 0.1 and 1.2 ± 0.1 for √s[subscript NN] = 62.4 and 200 GeV, respectively. The energy dependence of this ratio could reflect varying contributions from baryons to charged particles, while mesons are the dominant contributors to photon production in the given kinematic region. The photon pseudorapidity distributions normalized by average number of participating nucleon pairs, when plotted as a function of η - y beam , are found to follow a longitudinal scaling independent of centrality and colliding ion species at both beam energies. |
| first_indexed | 2024-09-23T08:11:18Z |
| format | Article |
| id | mit-1721.1/121380 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T08:11:18Z |
| publishDate | 2019 |
| publisher | Elsevier BV |
| record_format | dspace |
| spelling | mit-1721.1/1213802022-09-23T11:29:42Z Center of mass energy and system-size dependence of photon production at forward rapidity at RHIC Betancourt, Michael Joseph Corliss, Ross Cameron Hoffman, Alan Michael Jones, C. L. Kocoloski, Adam Philip Leight, William Axel Millner, R. Redwine, Robert P Sakuma, Tai Surrow, Bernd STAR Collaboration Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Laboratory for Nuclear Science We present the multiplicity and pseudorapidity distributions of photons produced in Au + Au and Cu + Cu collisions at √s[subscript NN] = 62.4 and 200 GeV. The photons are measured in the region - 3.7 < η < - 2.3 using the photon multiplicity detector in the STAR experiment at RHIC. The number of photons produced per average number of participating nucleon pairs increases with the beam energy and is independent of the collision centrality. For collisions with similar average numbers of participating nucleons the photon multiplicities are observed to be similar for Au + Au and Cu + Cu collisions at a given beam energy. The ratios of the number of charged particles to photons in the measured pseudorapidity range are found to be 1.4 ± 0.1 and 1.2 ± 0.1 for √s[subscript NN] = 62.4 and 200 GeV, respectively. The energy dependence of this ratio could reflect varying contributions from baryons to charged particles, while mesons are the dominant contributors to photon production in the given kinematic region. The photon pseudorapidity distributions normalized by average number of participating nucleon pairs, when plotted as a function of η - y beam , are found to follow a longitudinal scaling independent of centrality and colliding ion species at both beam energies. 2019-06-21T17:05:38Z 2019-06-21T17:05:38Z 2009-11 2009-11 2019-06-19T11:33:41Z Article http://purl.org/eprint/type/JournalArticle 0375-9474 https://hdl.handle.net/1721.1/121380 STAR Collaboration et al. "Center of mass energy and system-size dependence of photon production at forward rapidity at RHIC." Nuclear Physics A 832, 1-2 (January 2010): 134-147 © 2009 Elsevier B.V. en http://dx.doi.org/10.1016/j.nuclphysa.2009.11.011 Nuclear Physics A Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf Elsevier BV arXiv |
| spellingShingle | Betancourt, Michael Joseph Corliss, Ross Cameron Hoffman, Alan Michael Jones, C. L. Kocoloski, Adam Philip Leight, William Axel Millner, R. Redwine, Robert P Sakuma, Tai Surrow, Bernd STAR Collaboration Center of mass energy and system-size dependence of photon production at forward rapidity at RHIC |
| title | Center of mass energy and system-size dependence of photon production at forward rapidity at RHIC |
| title_full | Center of mass energy and system-size dependence of photon production at forward rapidity at RHIC |
| title_fullStr | Center of mass energy and system-size dependence of photon production at forward rapidity at RHIC |
| title_full_unstemmed | Center of mass energy and system-size dependence of photon production at forward rapidity at RHIC |
| title_short | Center of mass energy and system-size dependence of photon production at forward rapidity at RHIC |
| title_sort | center of mass energy and system size dependence of photon production at forward rapidity at rhic |
| url | https://hdl.handle.net/1721.1/121380 |
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