Energy dependence of π±, p and over(p, ̄) transverse momentum spectra for Au + Au collisions at sqrt(sNN) = 62.4 and 200 GeV

B. I. Abelev, M. M. Aggarwal, Z. Ahammed, B. D. Anderson, D. Arkhipkin, G. S. Averichev, Y. Bai, J. Balewski, O. Barannikova, L. S. Barnby, S. Baumgart, V. V. Belaga, A. Bellingeri-Laurikainen, R. Bellwied, F. Benedosso, R. R. Betts, S. Bharadwaj, A. Bhasin, A. K. Bhati, H. BichselJ. Bielcik, J. Bielcikova, A. Billmeier, L. C. Bland, S. L. Blyth, M. Bombara, B. E. Bonner, M. Botje, J. Bouchet, A. V. Brandin, A. Bravar, T. P. Burton, M. Bystersky, R. V. Cadman, X. Z. Cai, H. Caines, M. Calderón de la Barca Sánchez, J. Callner, O. Catu, D. Cebra, Z. Chajecki, P. Chaloupka, S. Chattopadhyay, H. F. Chen, J. H. Chen, J. Y. Chen, J. Cheng, M. Cherney, A. Chikanian, H. A. Choi, W. Christie, S. U. Chung, J. P. Coffin, T. M. Cormier, M. R. Cosentino, J. G. Cramer, H. J. Crawford, D. Das, S. Dash, M. Daugherity, M. M. de Moura, T. G. Dedovich, M. DePhillips, A. A. Derevschikov, L. Didenko, T. Dietel, P. Djawotho, S. M. Dogra, X. Dong, J. L. Drachenberg, J. E. Draper, F. Du, V. B. Dunin, J. C. Dunlop, M. R. Dutta Mazumdar, V. Eckardt, W. R. Edwards, L. G. Efimov, V. Emelianov, J. Engelage, G. Eppley, B. Erazmus, M. Estienne, P. Fachini, R. Fatemi, J. Fedorisin, A. Feng, P. Filip, E. Finch, V. Fine, Y. Fisyak, K. S.F. Fornazier, J. Fu, C. A. Gagliardi, L. Gaillard, M. S. Ganti, E. Garcia-Solis, V. Ghazikhanian, P. Ghosh, Y. G. Gorbunov, H. Gos, O. Grebenyuk, D. Grosnick, S. M. Guertin, K. S.F.F. Guimaraes, N. Gupta, B. Haag, T. J. Hallman, A. Hamed, J. W. Harris, W. He, M. Heinz, T. W. Henry, S. Hepplemann, B. Hippolyte, A. Hirsch, E. Hjort, A. M. Hoffman, G. W. Hoffmann, D. Hofman, R. Hollis, M. J. Horner, H. Z. Huang, E. W. Hughes, T. J. Humanic, G. Igo, A. Iordanova, P. Jacobs, W. W. Jacobs, P. Jakl, F. Jia, H. Jiang, P. G. Jones, E. G. Judd, S. Kabana, K. Kang, J. Kapitan, M. Kaplan, D. Keane, A. Kechechyan, D. Kettler, V. Yu Khodyrev, B. C. Kim, J. Kiryluk, A. Kisiel, E. M. Kislov, S. R. Klein, A. G. Knospe, A. Kocoloski, D. D. Koetke, T. Kollegger, M. Kopytine, L. Kotchenda, V. Kouchpil, K. L. Kowalik, M. Kramer, P. Kravtsov, V. I. Kravtsov, K. Krueger, C. Kuhn, A. I. Kulikov, A. Kumar, P. Kurnadi, A. A. Kuznetsov, M. A.C. Lamont, J. M. Landgraf, S. Lange, S. LaPointe, F. Laue, J. Lauret, A. Lebedev, R. Lednicky, C. H. Lee, S. Lehocka, M. J. LeVine, C. Li, Q. Li, Y. Li, G. Lin, X. Lin, S. J. Lindenbaum, M. A. Lisa, F. Liu, H. Liu, J. Liu, L. Liu, T. Ljubicic, W. J. Llope, H. Long, R. S. Longacre, M. Lopez-Noriega, W. A. Love, Y. Lu, T. Ludlam, D. Lynn, G. L. Ma, J. G. Ma, Y. G. Ma, D. P. Mahapatra, R. Majka, L. K. Mangotra, R. Manweiler, S. Margetis, C. Markert, L. Martin, H. S. Matis, Yu A. Matulenko, C. J. McClain, T. S. McShane, Yu Melnick, A. Meschanin, J. Millane, M. L. Miller, N. G. Minaev, S. Mioduszewski, C. Mironov, A. Mischke, J. Mitchell, B. Mohanty, L. Molnar, D. A. Morozov, M. G. Munhoz, B. K. Nandi, C. Nattrass, T. K. Nayak, J. M. Nelson, C. Nepali, P. K. Netrakanti, V. A. Nikitin, L. V. Nogach, S. B. Nurushev, G. Odyniec, A. Ogawa, V. Okorokov, M. Oldenburg, D. Olson, M. Pachr, S. K. Pal, Y. Panebratsev, S. Y. Panitkin, A. I. Pavlinov, T. Pawlak, T. Peitzmann, V. Perevoztchikov, C. Perkins, W. Peryt, S. C. Phatak, M. Planinic, J. Pluta, N. Poljak, N. Porile, A. M. Poskanzer, M. Potekhin, E. Potrebenikova, B. V.K.S. Potukuchi, D. Prindle, C. Pruneau, J. Putschke, I. A. Qattan, R. Raniwala, S. Raniwala, R. L. Ray, S. V. Razin, J. Reinnarth, D. Relyea, A. Ridiger, H. G. Ritter, J. B. Roberts, O. V. Rogachevskiy, J. L. Romero, A. Rose, C. Roy, L. Ruan, M. J. Russcher, R. Sahoo, I. Sakrejda, T. Sakuma, S. Salur, J. Sandweiss, M. Sarsour, I. Savin, P. S. Sazhin, J. Schambach, R. P. Scharenberg, N. Schmitz, J. Seger, I. Selyuzhenkov, P. Seyboth, A. Shabetai, E. Shahaliev, M. Shao, M. Sharma, W. Q. Shen, S. S. Shimanskiy, E. Sichtermann, F. Simon, R. N. Singaraju, N. Smirnov, R. Snellings, P. Sorensen, J. Sowinski, J. Speltz, H. M. Spinka, B. Srivastava, A. Stadnik, T. D.S. Stanislaus, R. Stock, M. Strikhanov, B. Stringfellow, A. A.P. Suaide, M. C. Suarez, N. L. Subba, M. Sumbera, X. M. Sun, Z. Sun, B. Surrow, T. J.M. Symons, A. Szanto de Toledo, J. Takahashi, A. H. Tang, T. Tarnowsky, J. H. Thomas, A. R. Timmins, S. Timoshenko, M. Tokarev, T. A. Trainor, S. Trentalange, R. E. Tribble, O. D. Tsai, J. Ulery, T. Ullrich, D. G. Underwood, G. Van Buren, N. van der Kolk, M. van Leeuwen, A. M. Vander Molen, R. Varma, I. M. Vasilevski, A. N. Vasiliev, R. Vernet, S. E. Vigdor, Y. P. Viyogi, S. Vokal, S. A. Voloshin, W. T. Waggoner, F. Wang, G. Wang, J. S. Wang, X. L. Wang, Y. Wang, J. W. Watson, J. C. Webb, G. D. Westfall, A. Wetzler, C. Whitten, H. Wieman, S. W. Wissink, R. Witt, J. Wu, J. Wu, N. Xu, Q. H. Xu, Z. Xu, P. Yepes, I. K. Yoo, Q. Yue, V. I. Yurevich, W. Zhan, H. Zhang, W. M. Zhang, Y. Zhang, Z. P. Zhang, Y. Zhao, C. Zhong, R. Zoulkarneev, Y. Zoulkarneeva, A. N. Zubarev, J. X. Zuo

Research output: Contribution to journalArticlepeer-review

187 Scopus citations

Abstract

We study the energy dependence of the transverse momentum (pT) spectra for charged pions, protons and anti-protons for Au + Au collisions at sqrt(sNN) = 62.4 and 200 GeV. Data are presented at mid-rapidity (| y | < 0.5) for 0.2 < pT < 12 GeV / c. In the intermediate pT region (2 < pT < 6 GeV / c), the nuclear modification factor is higher at 62.4 GeV than at 200 GeV, while at higher pT (pT > 7 GeV / c) the modification is similar for both energies. The p / π+ and over(p, ̄) / π- ratios for central collisions at sqrt(sNN) = 62.4 GeV peak at pT ≃ 2 GeV / c. In the pT range where recombination is expected to dominate, the p / π+ ratios at 62.4 GeV are larger than at 200 GeV, while the over(p, ̄) / π- ratios are smaller. For pT > 2 GeV / c, the over(p, ̄) / π- ratios at the two beam energies are independent of pT and centrality indicating that the dependence of the over(p, ̄) / π- ratio on pT does not change between 62.4 and 200 GeV. These findings challenge various models incorporating jet quenching and/or constituent quark coalescence.

Original languageEnglish
Pages (from-to)104-113
Number of pages10
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume655
Issue number3-4
DOIs
StatePublished - Nov 1 2007

Bibliographical note

Funding Information:
We thank J. Alam, V. Greco, C.M. Ko, I. Vitev and X.-N. Wang for providing the theoretical results for comparison with the data. We thank the RHIC Operations Group and RCF at BNL, and the NERSC Center at LBNL for their support. This work was supported in part by the Offices of NP and HEP within the US DOE Office of Science; the US NSF; the BMBF of Germany; CNRS/IN2P3, RA, RPL, and EMN of France; EPSRC of the United Kingdom; FAPESP of Brazil; the Russian Ministry of Science and Technology; the Ministry of Education and the NNSFC of China; IRP and GA of the Czech Republic, FOM of the Netherlands, DAE, DST, and CSIR of the Government of India; Swiss NSF; the Polish State Committee for Scientific Research; SRDA of Slovakia, and the Korea Sci. & Eng. Foundation.

Keywords

  • Fragmentation
  • Jet quenching
  • Nuclear modification factor
  • Particle production
  • Particle ratios
  • Recombination

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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