Gluon saturation and net-proton spectra in relativistic nucleus-nucleus collisions

  • By means of the AKK08 fragmentation function, the net-proton transverse momentum (pT) spectra in A+A collisions are studied with two phenomenological models based on the Color Glass Condensate formalism. After a χ2 analysis of the experimental data from BRAHMS, the normalization constant C is extracted at RHIC energies of √sNN=62.4 and 200 GeV, and the theoretical results of the net-proton pT spectra at selected rapidities are also given. It is shown that the theoretical results are in good agreement with the experimental data. Finally, assuming the constant C should have an exponent dependence of √sNN, we also predict the theoretical results of net-proton pT spectra at LHC energies of √sNN=2.76, 3.94, and 5.52 TeV.
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  • [1] Gelis F, Iancu E, Jalilian-Marian J et al. hep-ph/1002.03332 Iancu E, Itakura K, Munier S. Phys. Lett. B, 2004, 590: 1993 Arsene I, Bearden I G, Beavis D et al. Phys. Rev. Lett., 2004, 93: 2423034 Kharzeev D, Kovchegov Y V, Tuchin K. Phys. Lett. B, 2004, 599: 235 Baier R, Mehtar-Tani Y, Schi D. Nucl. Phys. A, 2006, 764: 5156 Albacete J L, Marquet C. Phys. Lett. B, 2010, 687: 1747 Dumitru A, Hayashigaki A, Jalilian-Marian J. Nucl. Phys. A, 2006, 770: 578 Boer D, Utermann A, Wessels E. Phys. Rev. D, 2008, 77: 0540149 Balitsky I. Nucl. Phys. B, 1996, 463: 9910 Kovchegov Y V. Phys. Rev. D, 1999, 60: 03400811 Arsene I C, Bearden I G, Beavis D et al. Phys. Lett. B, 2009, 677: 26712 Bearden I G, Beavis D, Besliu C et al. Phys. Rev. Lett., 2004, 93: 10230113 Albacete J L. Phys. Rev. Lett., 2007, 99: 26230114 Mehtar-Tani Y, Wolschin G. Phys. Rev. C, 2009, 80: 05490515 Mehtar-Tani Y, Wolschin G. Phys. Lett. B, 2010, 688: 17416 Golec-Biernat K, Wustho M. Phys. Rev. D, 1999, 59: 01401717 Albino S, Kniehl B A, Kramer G. Nucl. Phys. B, 2008, 803: 4218 Armesto N, Cunqueiro L, Salgado C A et al. JHEP, 2008, 0802: 04819 Fries R J, Muller B, Nonaka C et al. Phys. Rev. Lett., 2003, 90: 20230320 Dumitru A, Hayashigaki A, Jalilian-Marian J. Nucl. Phys. A, 2006, 765: 46421 Kuiper R, Wolschin G. Ann. Phys., 2007, 16: 6722 Kovchegov Y V. Phys. Rev. D, 2000, 61: 07401823 Kharzeev D, Levin E, Nardi M. Nucl.Phys. A, 2004, 730: 44824 WANG H M, SUN X J, HOU Z Y. HEP NP, 2007, 31(11): 1040 (in Chinese)25 Kretzer S, LAI H L, Olness F et al. Phys. Rev. D, 2004, 69: 11400526 Aamodt K, Abel N, Abeysekara U et al. Eur. Phys. J. C, 2010, 65: 111
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WANG Hong-Min, HOU Zhao-Yu, WANG Xiu-Ting and SUN Xian-Jing. Gluon saturation and net-proton spectra in relativistic nucleus-nucleus collisions[J]. Chinese Physics C, 2011, 35(3): 255-258. doi: 10.1088/1674-1137/35/3/008
WANG Hong-Min, HOU Zhao-Yu, WANG Xiu-Ting and SUN Xian-Jing. Gluon saturation and net-proton spectra in relativistic nucleus-nucleus collisions[J]. Chinese Physics C, 2011, 35(3): 255-258.  doi: 10.1088/1674-1137/35/3/008 shu
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Received: 2010-06-23
Revised: 2010-06-12
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Gluon saturation and net-proton spectra in relativistic nucleus-nucleus collisions

Abstract: By means of the AKK08 fragmentation function, the net-proton transverse momentum (pT) spectra in A+A collisions are studied with two phenomenological models based on the Color Glass Condensate formalism. After a χ2 analysis of the experimental data from BRAHMS, the normalization constant C is extracted at RHIC energies of √sNN=62.4 and 200 GeV, and the theoretical results of the net-proton pT spectra at selected rapidities are also given. It is shown that the theoretical results are in good agreement with the experimental data. Finally, assuming the constant C should have an exponent dependence of √sNN, we also predict the theoretical results of net-proton pT spectra at LHC energies of √sNN=2.76, 3.94, and 5.52 TeV.

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