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Detailed study of high-p(T) neutral pion suppression and azimuthal anisotropy in Au plus Au collisions at root s(NN) =200 GeV

Adler, S. S.; Afanasiev, S.; Aidala, C.; Ajitanand, N. N.; Akiba, Y.; Alexander, J.; Amirikas, R.; Aphecetche, L.; Aronson, S. H. and Averbeck, R., et al. (2007) In Physical Review C (Nuclear Physics) 76(3).
Abstract
Measurements of neutral pion (pi(0)) production at midrapidity in root s(NN)=200 GeV Au+Au collisions as a function of transverse momentum, p(T), collision centrality, and angle with respect to reaction plane are presented. The data represent the final pi(0) results from the PHENIX experiment for the first RHIC Au+Au run at design center-of-mass energy. They include additional data obtained using the PHENIX Level-2 trigger with more than a factor of 3 increase in statistics over previously published results for p(T)>6 GeV/c. We evaluate the suppression in the yield of high-p(T) pi(0)'s relative to pointlike scaling expectations using the nuclear modification factor R-AA. We present the p(T) dependence of R-AA for nine bins in collision... (More)
Measurements of neutral pion (pi(0)) production at midrapidity in root s(NN)=200 GeV Au+Au collisions as a function of transverse momentum, p(T), collision centrality, and angle with respect to reaction plane are presented. The data represent the final pi(0) results from the PHENIX experiment for the first RHIC Au+Au run at design center-of-mass energy. They include additional data obtained using the PHENIX Level-2 trigger with more than a factor of 3 increase in statistics over previously published results for p(T)>6 GeV/c. We evaluate the suppression in the yield of high-p(T) pi(0)'s relative to pointlike scaling expectations using the nuclear modification factor R-AA. We present the p(T) dependence of R-AA for nine bins in collision centrality. We separately integrate R-AA over larger p(T) bins to show more precisely the centrality dependence of the high-p(T) suppression. We then evaluate the dependence of the high-p(T) suppression on the emission angle Delta phi of the pions with respect to event reaction plane for seven bins in collision centrality. We show that the yields of high-p(T) pi(0)'s vary strongly with Delta phi, consistent with prior measurements 1,2. We show that this variation persists in the most peripheral bin accessible in this analysis. For the peripheral bins we observe no suppression for neutral pions produced aligned with the reaction plane, whereas the yield of pi(0)'s produced perpendicular to the reaction plane is suppressed by a factor of similar to 2. We analyze the combined centrality and Delta phi dependence of the pi(0) suppression in different p(T) bins using different possible descriptions of parton energy loss dependence on jet path-length averages to determine whether a single geometric picture can explain the observed suppression pattern. (Less)
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Physical Review C (Nuclear Physics)
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76
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3
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American Physical Society
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  • wos:000249786600047
  • scopus:34848881889
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0556-2813
DOI
10.1103/PhysRevC.76.034904
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English
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@article{57744d6f-ac29-4e44-9b10-5c5c36710fcf,
  abstract     = {Measurements of neutral pion (pi(0)) production at midrapidity in root s(NN)=200 GeV Au+Au collisions as a function of transverse momentum, p(T), collision centrality, and angle with respect to reaction plane are presented. The data represent the final pi(0) results from the PHENIX experiment for the first RHIC Au+Au run at design center-of-mass energy. They include additional data obtained using the PHENIX Level-2 trigger with more than a factor of 3 increase in statistics over previously published results for p(T)>6 GeV/c. We evaluate the suppression in the yield of high-p(T) pi(0)'s relative to pointlike scaling expectations using the nuclear modification factor R-AA. We present the p(T) dependence of R-AA for nine bins in collision centrality. We separately integrate R-AA over larger p(T) bins to show more precisely the centrality dependence of the high-p(T) suppression. We then evaluate the dependence of the high-p(T) suppression on the emission angle Delta phi of the pions with respect to event reaction plane for seven bins in collision centrality. We show that the yields of high-p(T) pi(0)'s vary strongly with Delta phi, consistent with prior measurements 1,2. We show that this variation persists in the most peripheral bin accessible in this analysis. For the peripheral bins we observe no suppression for neutral pions produced aligned with the reaction plane, whereas the yield of pi(0)'s produced perpendicular to the reaction plane is suppressed by a factor of similar to 2. We analyze the combined centrality and Delta phi dependence of the pi(0) suppression in different p(T) bins using different possible descriptions of parton energy loss dependence on jet path-length averages to determine whether a single geometric picture can explain the observed suppression pattern.},
  articleno    = {034904},
  author       = {Adler, S. S. and Afanasiev, S. and Aidala, C. and Ajitanand, N. N. and Akiba, Y. and Alexander, J. and Amirikas, R. and Aphecetche, L. and Aronson, S. H. and Averbeck, R. and Awes, T. C. and Azmoun, R. and Babinstev, V. and Baldisseri, A. and Barish, K. N. and Barnes, P. D. and Bassalleck, B. and Bathe, S. and Batsouli, S. and Baublis, V. and Bazilevsky, A. and Belikov, S. and Berndnikov, Y. and Bhagavatula, S. and Boissevain, J. G. and Borel, H. and Borenstein, S. and Brooks, M. L. and Brown, D. S. and Bruner, N. and Bucher, D. and Buesching, H. and Bumazhnov, V. and Bunce, G. and Burward-Hoy, J. M. and Butsyk, S. and Camard, X. and Chai, J. -S. and Chand, P. and Chang, W. C. and Chernichenko, S. and Chi, C. Y. and Chiba, J. and Chiu, M. and Choi, I. J. and Choi, J. and Choudhury, R. K. and Chujo, T. and Cianciolo, V. and Cobigo, Y. and Cole, B. 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T. and Pantuev, V. and Papavassiliou, V. and Park, J. and Parmar, A. and Pate, S. F. and Peitzmann, T. and Peng, J. -C. and Peresedov, V. and Pinkenburg, C. and Pisani, R. P. and Plasil, F. and Purschke, M. L. and Purwar, A. K. and Rak, J. and Ravinovich, I. and Read, K. F. and Reuter, M. and Reygers, K. and Riabov, V. and Riabov, Y. and Roche, G. and Romana, A. and Rosati, M. and Rosnet, P. and Ryu, S. S. and Sadler, M. E. and Saito, N. and Sakaguchi, T. and Sakai, M. and Sakai, S. and Samsonov, V. and Sanfratello, L. and Santo, R. and Sato, H. D. and Sato, S. and Sawada, S. and Schutz, Y. and Semenov, V. and Seto, R. and Shaw, M. R. and Shea, T. K. and Shibata, T. -A. and Shigaki, K. and Shiina, T. and Silva, C. L. and Silvermyr, David and Sim, K. S. and Singh, C. P. and Singh, V. and Sivertz, M. and Soldatov, A. and Soltz, R. A. and Sondheim, W. E. and Sorensen, S. P. and Sourikova, I. V. and Staley, F. and Stankus, P. W. and Stenlund, Evert and Stepanov, M. and Ster, A. and Stoll, S. P. and Sugitate, T. and Sullivan, J. P. and Takagui, E. M. and Taketani, A. and Tamai, M. and Tanaka, K. H. and Tanaka, Y. and Tanida, K. and Tannenbaum, M. J. and Tarjan, P. and Tepe, J. D. and Thomas, T. L. and Tojo, J. and Torii, H. and Towell, R. S. and Tserruya, I. and Tsuruoka, H. and Tuli, S. K. and Tydesjö, Henrik and Tyurin, N. and van Hecke, H. W. and Velkovska, J. and Velkovsky, M. and Veszpremi, V. and Villatte, L. and Vinogradov, A. A. and Volkov, M. A. and Vznuzdaev, E. and Wang, X. R. and Watanabe, Y. and White, S. N. and Wohn, F. K. and Woody, C. L. and Xie, W. and Yang, Y. and Yanovich, A. and Yokkaichi, S. and Young, G. R. and Yushmanov, I. E. and Zajc, W. A. and Zhang, C. and Zhou, S. and Zhou, S. J. and Zolin, L.},
  issn         = {0556-2813},
  language     = {eng},
  number       = {3},
  publisher    = {American Physical Society},
  series       = {Physical Review C (Nuclear Physics)},
  title        = {Detailed study of high-p(T) neutral pion suppression and azimuthal anisotropy in Au plus Au collisions at root s(NN) =200 GeV},
  url          = {http://dx.doi.org/10.1103/PhysRevC.76.034904},
  volume       = {76},
  year         = {2007},
}