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Title: PHENIX Measurement of High-p T Hadron-Hadron and Photon-Hadron Azimuthal Correlations

Abstract

High-p{sub T} hadron-hadron correlations have been measured with the PHENIX experiment in Cu and pp collisions at {radical}s{sub NN}=200 GeV. A comparison of the jet widths and yields between the two colliding systems allows us to study the medium effect on jets. We also present a first measurement of direct photon-hadron correlations in Au and pp collisions. We find that the near-side yields are consistent with zero in both systems. By comparing the jet yields on the away side, we observe a suggestion of the expected suppression of hadrons associated with photons in Au collisions.

Authors:
 [1];  [2];  [3];  [2];  [3];  [2];  [2];  [4];  [2];  [2];  [3];  [5]
  1. Columbia University
  2. ORNL
  3. University of Tennessee, Knoxville (UTK) & Oak Ridge National Laboratory (ORNL)
  4. University of Tennessee, Knoxville (UTK)
  5. The
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
931209
DOE Contract Number:
DE-AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: 19th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions: Quark Matter 2006, Shanghai, China, 20061114, 20061120
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; HADRONS; PHOTONS; QUARK MATTER; JETS

Citation Formats

Jin, J., Awes, Terry C, Batsouli, Sotiria, Cianciolo, Vince, Efremenko, Yuri, Read Jr, Kenneth F, Silvermyr, David O, Sorensen, Soren P, Stankus, Paul W, Young, Glenn R, Zhang, Chun, and PHENIX, Collaboration. PHENIX Measurement of High-pT Hadron-Hadron and Photon-Hadron Azimuthal Correlations. United States: N. p., 2007. Web.
Jin, J., Awes, Terry C, Batsouli, Sotiria, Cianciolo, Vince, Efremenko, Yuri, Read Jr, Kenneth F, Silvermyr, David O, Sorensen, Soren P, Stankus, Paul W, Young, Glenn R, Zhang, Chun, & PHENIX, Collaboration. PHENIX Measurement of High-pT Hadron-Hadron and Photon-Hadron Azimuthal Correlations. United States.
Jin, J., Awes, Terry C, Batsouli, Sotiria, Cianciolo, Vince, Efremenko, Yuri, Read Jr, Kenneth F, Silvermyr, David O, Sorensen, Soren P, Stankus, Paul W, Young, Glenn R, Zhang, Chun, and PHENIX, Collaboration. Mon . "PHENIX Measurement of High-pT Hadron-Hadron and Photon-Hadron Azimuthal Correlations". United States. doi:.
@article{osti_931209,
title = {PHENIX Measurement of High-pT Hadron-Hadron and Photon-Hadron Azimuthal Correlations},
author = {Jin, J. and Awes, Terry C and Batsouli, Sotiria and Cianciolo, Vince and Efremenko, Yuri 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 = {High-p{sub T} hadron-hadron correlations have been measured with the PHENIX experiment in Cu and pp collisions at {radical}s{sub NN}=200 GeV. A comparison of the jet widths and yields between the two colliding systems allows us to study the medium effect on jets. We also present a first measurement of direct photon-hadron correlations in Au and pp collisions. We find that the near-side yields are consistent with zero in both systems. By comparing the jet yields on the away side, we observe a suggestion of the expected suppression of hadrons associated with photons in Au collisions.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}

Conference:
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  • Correlations of charged hadrons of 1 < p{sub T} < 10 Gev/c with high p{sub T} direct photons and {pi}{sup 0} mesons in the range 5 < p{sub T} < 15 Gev/c are used to study jet fragmentation in the {gamma} + jet and dijet channels, respectively. The magnitude of the partonic transverse momentum, k{sub T}, is obtained by comparing to a model incorporating a Gaussian k{sub T} smearing. The sensitivity of the associated charged hadron spectra to the underlying fragmentation function is tested and the data are compared to calculations using recent global fit results. The shape of themore » direct photon-associated hadron spectrum as well as its charge asymmetry are found to be consistent with a sample dominated by quark-gluon Compton scattering. No significant evidence of fragmentation photon correlated production is observed within experimental uncertainties.« less
  • Correlations of charged hadrons of 1<p{sub T}<10 Gev/c with high p{sub T} direct photons and {pi}{sup 0} mesons in the range 5<p{sub T}<15 Gev/c are used to study jet fragmentation in the {gamma}+jet and dijet channels, respectively. The magnitude of the partonic transverse momentum, k{sub T}, is obtained by comparing to a model incorporating a Gaussian k{sub T} smearing. The sensitivity of the associated charged hadron spectra to the underlying fragmentation function is tested and the data are compared to calculations using recent global fit results. The shape of the direct photon-associated hadron spectrum as well as its charge asymmetrymore » are found to be consistent with a sample dominated by quark-gluon Compton scattering. No significant evidence of fragmentation photon correlated production is observed within experimental uncertainties.« less
  • Measurements of inclusive spectra of hadrons at large transverse momentum over a broad range of energy in different collision systems have been performed with the PHENIX experiment at RHIC. The data allow us to study the energy and system size dependence of the suppression observed in R{sub AA} of high-p{sub T} hadrons at {radical}s{sub NN} = 200 GeV. Due to the large energy range from {radical}s{sub NN} = 22 GeV to 200 GeV, the results can be compared to results from CERN SPS at a similar energy. The large Au+Au dataset from the 2004 run of RHIC also allows usmore » to constrain theoretical models that describe the hot and dense matter produced in such collisions. Investigation of particle ratios such as {eta}/{pi}{sup 0} helps in understanding the mechanisms of energy loss.« less
  • Particle-type dependences of hadron yield suppression/enhancement patterns, especially its difference between mesons and baryons, at intermediate p{sub T} (2-5 GeV/c) is one of the findings in heavy ion collisions at RHIC. A systematic study of identified hadron production was performed in Au+Au/Cu+Cu collisions at {radical}s{sub NN} = 62.4/200 GeV, to investigate the possible origins of this difference. In this paper, we show particle ratios, nuclear modification factors and their scaling properties.