System size in relativistic heavy ion collisions

  • System size is more than a geometrical quantity in relativistic heavy ion collisions; it is closely related to evolution process, i.e. a different system size corresponds to a different evolution process, and whether QGP is produced depends on the system size. We propose that the system size should be under the same level when comparing the measurements from different colliding nuclei. The equivalence of the peripheral collisions of Au-Au and the central collisions of smaller nuclei is studied using the Monte Carlo method. Comparing the transverse overlapping area of the colliding nuclei, the number of participant nucleons and the number of nucleon-nucleon binary collisions in various colliding nuclei, we give an estimate of the correspondence in system size. This is helpful in the experimental comparison of the measurements from different colliding nuclei.
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  • [1] Lee T D, Wick G C. Phys. Rev. D, 1974, 9: 22912 Lee T D. Rev. Mod. Phys., 1975, 47: 2673 Shuryak E V. Phys. Rept., 1980, 61: 714 Abbott T et al. (E802 collaboration). Phys. Lett. B, 1987, 197: 2855 Bamberger A et al. (NA35 collaboration). Phys. Lett. B, 1987, 184: 2716 Albrecht R et al. Phys. Lett. B, 1988, 202: 5967 Jacob M. Quark Matter, Facts and Hope. In: CERN Preprint CERN-TH-5171-88, 19888 Adams J et al. (STAR collaboration). Nucl. Phys. A, 2005, 757: 1029 Adcox K et al. (PHENIX collaboration). Nucl. Phys. A, 2005, 757: 18410 Back B B et al. (PHOBOS collaboration). Nucl. Phys. A, 2005, 757: 2811 Arsene I et al. (BRAHMS collaboration). Nucl. Phys. A, 2005, 757: 112 Abelev B I et al. (STAR collaboration). Phys. Rev. C, 2009, 80: 02490513 Abelev B I et al. (STAR collaboration). Phys. Rev. C, 2009, 79: 02490614 Plumer M, Gyulassy M, WANG X N. Nucl. Phys. A, 1995, 590: 511; Adler C et al. (STAR collaboration). Phys. Rev. Lett., 2003, 90: 082302; Adams J et al. (STAR collabora-tion). ibid., 2003, 91: 07230415 Glauber R J. In: Brittin W E and Dunham L G ed. Lec-tures in Theorectical Physics (Vol. 1). New York: Inter-science, 1959, 31516 Wong Cheuk-Yin. Introduction to High-Energy Heavy Ion Collisions. Singapore: World Scienti c, 1994. 256-26017 Abelev B I et al. (STAR collaboration). Phys. Lett. B, 2009, 673: 18318 Abelev B I et al. (STAR collaboration). Nucl. Phys. A, 2010, 832: 13419 Abelev B I et al. (STAR collaboration). arXiv: 0911.3130v1[nucl-ex]20 Iordanova A (STAR collaboration). J. Phys. G, 2008, 35: 04400821 Takahashi J (STAR collaboration). J. Phys. G, 2008, 35: 04400722 Abelev B I et al. (STAR collaboration). Phys. Lett. B, 2010, 683: 12323 NING Ping-Zhi et al. Fundamentals of Nuclear Physics. Higher Education Press, 2003. 296 (in Chinese)24 Abelev B I et al. (STAR collaboration). arXiv: 0808.2041v2 [nucl-ex]
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WANG Yang-Yang, ZHAO Lin-Jie, YUAN Zhong-Sheng, ZHANG Dan-Dan, FANG Wei and XU Ming-Mei. System size in relativistic heavy ion collisions[J]. Chinese Physics C, 2011, 35(3): 264-268. doi: 10.1088/1674-1137/35/3/010
WANG Yang-Yang, ZHAO Lin-Jie, YUAN Zhong-Sheng, ZHANG Dan-Dan, FANG Wei and XU Ming-Mei. System size in relativistic heavy ion collisions[J]. Chinese Physics C, 2011, 35(3): 264-268.  doi: 10.1088/1674-1137/35/3/010 shu
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Received: 2010-06-12
Revised: 2010-06-12
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System size in relativistic heavy ion collisions

Abstract: System size is more than a geometrical quantity in relativistic heavy ion collisions; it is closely related to evolution process, i.e. a different system size corresponds to a different evolution process, and whether QGP is produced depends on the system size. We propose that the system size should be under the same level when comparing the measurements from different colliding nuclei. The equivalence of the peripheral collisions of Au-Au and the central collisions of smaller nuclei is studied using the Monte Carlo method. Comparing the transverse overlapping area of the colliding nuclei, the number of participant nucleons and the number of nucleon-nucleon binary collisions in various colliding nuclei, we give an estimate of the correspondence in system size. This is helpful in the experimental comparison of the measurements from different colliding nuclei.

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