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Title: Studying the Medium Modifications of Jets via High-p T Hadron Angular Correlations

Abstract

We report the analysis of high-P{sub T} hadron angular correlation performed by the PHENIX collaboration. The goal of the analysis is to investigate the medium modification of jets in the RHIC heavy-ion collisions. Two angular correlation techniques are used in our analysis: two-particle azimuthal correlation (2-p) and three-particle correlation (3-p). In the 2-p analysis, we focus on the P{sub T} and collision system evolution of the jets medium modification. In the 3-p analysis, we focus on the discrimination of two scenarios of jets medium modification, Mach Cone and deflected jets.

Authors:
 [1];  [2];  [1];  [2];  [1];  [2];  [2];  [3];  [2];  [2];  [4]
  1. University of Tennessee, Knoxville (UTK) & Oak Ridge National Laboratory (ORNL)
  2. 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:
931200
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; ANGULAR CORRELATION; HADRONS; MODIFICATIONS; QUARK MATTER; JETS

Citation Formats

Zhang, Chun, 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, and PHENIX, Collaboration. Studying the Medium Modifications of Jets via High-pT Hadron Angular Correlations. United States: N. p., 2007. Web.
Zhang, Chun, 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, & PHENIX, Collaboration. Studying the Medium Modifications of Jets via High-pT Hadron Angular Correlations. United States.
Zhang, Chun, 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, and PHENIX, Collaboration. Mon . "Studying the Medium Modifications of Jets via High-pT Hadron Angular Correlations". United States. doi:.
@article{osti_931200,
title = {Studying the Medium Modifications of Jets via High-pT Hadron Angular Correlations},
author = {Zhang, Chun 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 PHENIX, Collaboration},
abstractNote = {We report the analysis of high-P{sub T} hadron angular correlation performed by the PHENIX collaboration. The goal of the analysis is to investigate the medium modification of jets in the RHIC heavy-ion collisions. Two angular correlation techniques are used in our analysis: two-particle azimuthal correlation (2-p) and three-particle correlation (3-p). In the 2-p analysis, we focus on the P{sub T} and collision system evolution of the jets medium modification. In the 3-p analysis, we focus on the discrimination of two scenarios of jets medium modification, Mach Cone and deflected jets.},
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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  • 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.
  • D{O} has used W {yields} e{nu} and Z {yields} e{sup +}e{sup -} events produced in association with a high p{sub T}, jet to examine the effects of strong radiative corrections. We have compared the primary jet pseudorapidity distribution, as a function of reconstructed W or Z boson rapidity to leading order (LO) and Next-to-Leading order (NLO) QCD Monte Carlo generators, as well as a model based on extended color dipoles. We find that the primary jet is more central than either LO or NLO expectations. None of the Monte Carlo programs does a good job of predicting the shape ofmore » the jet distributions as a function of intermediate vector bosons rapidity.« less
  • A glasma flux-tube model has been proposed to explain strong elongation on pseudorapidity η of the same-side two-dimensional (2D) peak in minimum-bias angular correlations from √( sNN)=200 GeV Au-Au collisions. The same-side peak or “soft ridge” is said to arise from coupling of flux tubes to radial flow whereby gluons radiated transversely from flux tubes are boosted by radial flow to form a narrow structure or ridge on azimuth. In this study we test the theory conjecture by comparing measurements to predictions for particle production, spectra, and correlations from the glasma model and from conventional fragmentation processes. We conclude thatmore » the glasma model is contradicted by measured hadron yields, spectra, and correlations, whereas a two-component model of hadron production, including minimum-bias parton fragmentation, provides a quantitative description of most features of the data, although η elongation of the same-side 2D peak remains undescribed.« less
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  • There is a rare and clear consensus among experimentalists that jets and hard-scattering phenomena in Relativistic Heavy Ion (RHI) collisions can best (if not only) be studied using leading particles, in the same way that these phenomena were originally discovered and mapped out in p - p collisions.
  • A glasma flux-tube model has been proposed to explain strong elongation on pseudorapidity {eta} of the same-side two-dimensional (2D) peak in minimum-bias angular correlations from {radical}(s{sub NN})=200 GeV Au-Au collisions. The same-side peak or ''soft ridge'' is said to arise from coupling of flux tubes to radial flow whereby gluons radiated transversely from flux tubes are boosted by radial flow to form a narrow structure or ridge on azimuth. In this study we test the theory conjecture by comparing measurements to predictions for particle production, spectra, and correlations from the glasma model and from conventional fragmentation processes. We conclude thatmore » the glasma model is contradicted by measured hadron yields, spectra, and correlations, whereas a two-component model of hadron production, including minimum-bias parton fragmentation, provides a quantitative description of most features of the data, although {eta} elongation of the same-side 2D peak remains undescribed.« less