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Title: Centrality Dependence of {pi} 0 and {eta} Production at Large Transverse Momentum in sqrt(s_NN) = 200 GeV d + Au Collisions

Abstract

The dependence of transverse momentum spectra of neutral pions and {eta} mesons with p{sub T}<16 GeV/c and p{sub T}<12 GeV/c, respectively, on the centrality of the collision has been measured at midrapidity by the PHENIX experiment at the BNL Relativistic Heavy Ion Collider (RHIC) in d+Au collisions at {radical}s{sub NN}=200 GeV. The measured yields are compared to those in p+p collisions at the same {radical}s{sub NN} scaled by the number of underlying nucleon-nucleon collisions in d+Au. At all centralities, the yield ratios show no suppression, in contrast to the strong suppression seen for central Au+Au collisions at RHIC. Only a weak pT and centrality dependence can be observed.

Authors:
 [1];  [2];  [1];  [2];  [1];  [1];  [1];  [3];  [1];  [1];  [2];  [4]
  1. ORNL
  2. University of Tennessee, Knoxville (UTK) & Oak Ridge National Laboratory (ORNL)
  3. University of Tennessee, Knoxville (UTK)
  4. The
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
931510
DOE Contract Number:
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 98; Journal Issue: 17
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 74 ATOMIC AND MOLECULAR PHYSICS; BNL; HEAVY IONS; MESONS; PIONS; PRODUCTION; SPECTRA; TRANSVERSE MOMENTUM

Citation Formats

Awes, Terry C, Batsouli, Sotiria, Cianciolo, Vince, Efremenko, Yuri, Plasil, F, Read Jr, Kenneth F, Silvermyr, David O, Sorensen, Soren P, Stankus, Paul W, Young, Glenn R, Zhang, Chun, and PHENIX, Collaboration. Centrality Dependence of {pi}0 and {eta} Production at Large Transverse Momentum in sqrt(s_NN) = 200 GeV d + Au Collisions. United States: N. p., 2007. Web.
Awes, Terry C, Batsouli, Sotiria, Cianciolo, Vince, Efremenko, Yuri, Plasil, F, Read Jr, Kenneth F, Silvermyr, David O, Sorensen, Soren P, Stankus, Paul W, Young, Glenn R, Zhang, Chun, & PHENIX, Collaboration. Centrality Dependence of {pi}0 and {eta} Production at Large Transverse Momentum in sqrt(s_NN) = 200 GeV d + Au Collisions. United States.
Awes, Terry C, Batsouli, Sotiria, Cianciolo, Vince, Efremenko, Yuri, Plasil, F, Read Jr, Kenneth F, Silvermyr, David O, Sorensen, Soren P, Stankus, Paul W, Young, Glenn R, Zhang, Chun, and PHENIX, Collaboration. Sun . "Centrality Dependence of {pi}0 and {eta} Production at Large Transverse Momentum in sqrt(s_NN) = 200 GeV d + Au Collisions". United States. doi:.
@article{osti_931510,
title = {Centrality Dependence of {pi}0 and {eta} Production at Large Transverse Momentum in sqrt(s_NN) = 200 GeV d + Au Collisions},
author = {Awes, Terry C and Batsouli, Sotiria and Cianciolo, Vince and Efremenko, Yuri and Plasil, F and Read Jr, Kenneth F and Silvermyr, David O and Sorensen, Soren P and Stankus, Paul W and Young, Glenn R and Zhang, Chun and PHENIX, Collaboration},
abstractNote = {The dependence of transverse momentum spectra of neutral pions and {eta} mesons with p{sub T}<16 GeV/c and p{sub T}<12 GeV/c, respectively, on the centrality of the collision has been measured at midrapidity by the PHENIX experiment at the BNL Relativistic Heavy Ion Collider (RHIC) in d+Au collisions at {radical}s{sub NN}=200 GeV. The measured yields are compared to those in p+p collisions at the same {radical}s{sub NN} scaled by the number of underlying nucleon-nucleon collisions in d+Au. At all centralities, the yield ratios show no suppression, in contrast to the strong suppression seen for central Au+Au collisions at RHIC. Only a weak pT and centrality dependence can be observed.},
doi = {},
journal = {Physical Review Letters},
number = 17,
volume = 98,
place = {United States},
year = {Sun Apr 01 00:00:00 EDT 2007},
month = {Sun Apr 01 00:00:00 EDT 2007}
}
  • The dependence of transverse momentum spectra of neutral pions and {eta} mesons with p{sub T}<16 GeV/c and p{sub T}<12 GeV/c, respectively, on the centrality of the collision has been measured at midrapidity by the PHENIX experiment at the BNL Relativistic Heavy Ion Collider (RHIC) in d+Au collisions at {radical}(s{sub NN})=200 GeV. The measured yields are compared to those in p+p collisions at the same {radical}(s{sub NN}) scaled by the number of underlying nucleon-nucleon collisions in d+Au. At all centralities, the yield ratios show no suppression, in contrast to the strong suppression seen for central Au+Au collisions at RHIC. Only amore » weak p{sub T} and centrality dependence can be observed.« less
  • We report a measurement of high-p{sub T} inclusive {pi}{sup 0}, {eta}, and direct photon production in p + p and d + Au collisions at {radical}s{sub NN} = 200 GeV at midrapidity (0 < {eta} < 1). Photons from the decay {pi}{sup 0} {yields} {gamma}{gamma} were detected in the Barrel Electromagnetic Calorimeter of the STAR experiment at the Relativistic Heavy Ion Collider. The {eta} {yields} {gamma}{gamma} decay was also observed and constituted the first {eta} measurement by STAR. The first direct photon cross section measurement by STAR is also presented, the signal was extracted statistically by subtracting the {pi}{sup 0},more » {eta}, and {omega}(782) decay background from the inclusive photon distribution observed in the calorimeter. The analysis is described in detail, and the results are found to be in good agreement with earlier measurements and with next-to-leading order perturbative QCD calculations.« less
  • We report a measurement of high-p{sub T} inclusive {pi}{sup 0}, {eta}, and direct photon production in p+p and d+Au collisions at {radical}s{sub NN} = 200 GeV at midrapidity (0 < {eta} < 1). Photons from the decay {pi}{sup 0} {yields} {gamma}{gamma} were detected in the barrel electromagnetic calorimeter of the STAR experiment at the Relativistic Heavy Ion Collider. The {eta} {yields} {gamma}{gamma} decay was also observed and constituted the first {eta} measurement by STAR. The first direct photon cross-section measurement by STAR is also presented; the signal was extracted statistically by subtracting the {pi}{sup 0}, {eta}, and {omega}(782) decay backgroundmore » from the inclusive photon distribution observed in the calorimeter. The analysis is described in detail, and the results are found to be in good agreement with earlier measurements and with next-to-leading-order perturbative QCD calculations.« less
  • The PHENIX experiment at the BNL Relativistic Heavy Ion Collider (RHIC)has measured J/{psi} production for rapidities -2.2<y<2.2 in Au+Au collisions at {radical}(s{sub NN})=200 GeV. The J/{psi} invariant yield and nuclear modification factor R{sub AA} as a function of centrality, transverse momentum, and rapidity are reported. A suppression of J/{psi} relative to binary collision scaling of proton-proton reaction yields is observed. Models which describe the lower energy J/{psi} data at the CERN Super Proton Synchrotron invoking only J/psi destruction based on the local medium density predicta significantly larger suppression at RHIC and more suppression at midrapidity than at forward rapidity. Bothmore » trends are contradicted by our data.« less
  • We report a measurement of high-p{sub T} inclusive pi{sup 0}, eta, and direct photon production in p+p and d+Au collisions at sq root(s{sub NN})=200 GeV at midrapidity (0<eta<1). Photons from the decay pi{sup 0}->gammagamma were detected in the barrel electromagnetic calorimeter of the STAR experiment at the Relativistic Heavy Ion Collider. The eta->gammagamma decay was also observed and constituted the first eta measurement by STAR. The first direct photon cross-section measurement by STAR is also presented; the signal was extracted statistically by subtracting the pi{sup 0}, eta, and omega(782) decay background from the inclusive photon distribution observed in the calorimeter.more » The analysis is described in detail, and the results are found to be in good agreement with earlier measurements and with next-to-leading-order perturbative QCD calculations.« less