Abstract
The PHENIX experiment has measured the production of π0s in Au+Au collisions at √sNN = 200 GeV. The new data offer a fourfold increase in recorded luminosity, providing higher precision and a larger reach in transverse momentum, pT, to 20 GeV/c. The production ratio of η/π0 is 0.46±0.01(stat)±0.05(syst), constant with p T and collision centrality. The observed ratio is consistent with earlier measurements, as well as with the p+p and d+Au values. π0 are suppressed by a factor of 5, as in earlier findings. However, with the improved statistical precision a small but significant rise of the nuclear modification factor RAA vs pT, with a slope of 0.0106±0.00290. 0034 (Gev/c)-1, is discernible in central collisions. A phenomenological extraction of the average fractional parton energy loss shows a decrease with increasing pT. To study the path-length dependence of suppression, the π0 yield is measured at different angles with respect to the event plane; a strong azimuthal dependence of the π0 RAA is observed. The data are compared to theoretical models of parton energy loss as a function of the path length L in the medium. Models based on perturbative quantum chromodynamics are insufficient to describe the data, while a hybrid model utilizing pQCD for the hard interactions and anti-de-Sitter space/conformal field theory (AdS/CFT) for the soft interactions is consistent with the data.
| Original language | American English |
|---|---|
| Article number | 034911 |
| Journal | Physical Review C - Nuclear Physics |
| Volume | 87 |
| Issue number | 3 |
| DOIs | |
| State | Published - 28 Mar 2013 |
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
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In: Physical Review C - Nuclear Physics, Vol. 87, No. 3, 034911, 28.03.2013.
Research output: Contribution to journal › Article › peer-review
TY - JOUR
T1 - Neutral pion production with respect to centrality and reaction plane in Au+Au collisions at √sNN=200 GeV
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N1 - Office of Nuclear Physics in the Office of Science of the Department of Energy; National Science Foundation; Abilene Christian University Research Council; Research Foundation of SUNY; College of Arts and Sciences, Vanderbilt University (USA); Ministry of Education, Culture, Sports, Science, and Technology; Japan Society for the Promotion of Science (Japan); Conselho Nacional de Desenvolvimento Cientifico e Tecnologico; Natural Science Foundation of China (People's Republic of China); Ministry of Education, Youth and Sports (Czech Republic); Centre National de la Recherche Scientifique; Commissariat a l'Energie Atomique; Institut National de Physique Nucleaire et de Physique des Particules (France); Bundesministerium fur Bildung und Forschung, Deutscher Akademischer Austausch Dienst; Hungarian National Science Fund, OTKA (Hungary); Department of Atomic Energy; Israel Science Foundation (Israel); National Research Foundation; Ministry of Education and Science, Russian Academy of Sciences, Federal Agency of Atomic Energy (Russia); VR; Wallenberg Foundation (Sweden); US Civilian Research and Development Foundation for the Independent States of the Former Soviet Union; US-Hungarian Fulbright Foundation for Educational Exchange; US-Israel Binational Science Foundation; Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (Brazil); Alexander von Humboldt Stiftung (Germany); Department of Science and Technology (India); WCU Program of the Ministry Education Science and Technology (Korea)We thank the staff of the Collider-Accelerator and Physics Departments at Brookhaven National Laboratory and the staff of the other PHENIX participating institutions for their vital contributions. We acknowledge support from the Office of Nuclear Physics in the Office of Science of the Department of Energy; the National Science Foundation; the Abilene Christian University Research Council; the Research Foundation of SUNY; the Dean of the College of Arts and Sciences, Vanderbilt Univer
PY - 2013/3/28
Y1 - 2013/3/28
N2 - The PHENIX experiment has measured the production of π0s in Au+Au collisions at √sNN = 200 GeV. The new data offer a fourfold increase in recorded luminosity, providing higher precision and a larger reach in transverse momentum, pT, to 20 GeV/c. The production ratio of η/π0 is 0.46±0.01(stat)±0.05(syst), constant with p T and collision centrality. The observed ratio is consistent with earlier measurements, as well as with the p+p and d+Au values. π0 are suppressed by a factor of 5, as in earlier findings. However, with the improved statistical precision a small but significant rise of the nuclear modification factor RAA vs pT, with a slope of 0.0106±0.00290. 0034 (Gev/c)-1, is discernible in central collisions. A phenomenological extraction of the average fractional parton energy loss shows a decrease with increasing pT. To study the path-length dependence of suppression, the π0 yield is measured at different angles with respect to the event plane; a strong azimuthal dependence of the π0 RAA is observed. The data are compared to theoretical models of parton energy loss as a function of the path length L in the medium. Models based on perturbative quantum chromodynamics are insufficient to describe the data, while a hybrid model utilizing pQCD for the hard interactions and anti-de-Sitter space/conformal field theory (AdS/CFT) for the soft interactions is consistent with the data.
AB - The PHENIX experiment has measured the production of π0s in Au+Au collisions at √sNN = 200 GeV. The new data offer a fourfold increase in recorded luminosity, providing higher precision and a larger reach in transverse momentum, pT, to 20 GeV/c. The production ratio of η/π0 is 0.46±0.01(stat)±0.05(syst), constant with p T and collision centrality. The observed ratio is consistent with earlier measurements, as well as with the p+p and d+Au values. π0 are suppressed by a factor of 5, as in earlier findings. However, with the improved statistical precision a small but significant rise of the nuclear modification factor RAA vs pT, with a slope of 0.0106±0.00290. 0034 (Gev/c)-1, is discernible in central collisions. A phenomenological extraction of the average fractional parton energy loss shows a decrease with increasing pT. To study the path-length dependence of suppression, the π0 yield is measured at different angles with respect to the event plane; a strong azimuthal dependence of the π0 RAA is observed. The data are compared to theoretical models of parton energy loss as a function of the path length L in the medium. Models based on perturbative quantum chromodynamics are insufficient to describe the data, while a hybrid model utilizing pQCD for the hard interactions and anti-de-Sitter space/conformal field theory (AdS/CFT) for the soft interactions is consistent with the data.
UR - http://www.scopus.com/inward/record.url?scp=84875969027&partnerID=8YFLogxK
U2 - 10.1103/PhysRevC.87.034911
DO - 10.1103/PhysRevC.87.034911
M3 - Article
SN - 0556-2813
VL - 87
JO - Physical Review C - Nuclear Physics
JF - Physical Review C - Nuclear Physics
IS - 3
M1 - 034911
ER -