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Title: PHENIX Highlights I: Propagation of Partons in a Coloured Medium

Abstract

In this contribution I present recent results from the PHENIX collaboration, with a particular emphasis on measurements relating to the propagation of partons in a colored medium.

Authors:
 [1];  [2];  [3];  [2];  [3];  [2];  [2];  [4];  [2];  [2];  [3];  [5]
  1. Iowa State 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:
931197
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:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; QUARK MATTER; COLLISIONS; HIGH ENERGY PHYSICS

Citation Formats

Lajoie, John, 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 Highlights I: Propagation of Partons in a Coloured Medium. United States: N. p., 2007. Web.
Lajoie, John, 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 Highlights I: Propagation of Partons in a Coloured Medium. United States.
Lajoie, John, 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 Highlights I: Propagation of Partons in a Coloured Medium". United States. doi:.
@article{osti_931197,
title = {PHENIX Highlights I: Propagation of Partons in a Coloured Medium},
author = {Lajoie, John 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 = {In this contribution I present recent results from the PHENIX collaboration, with a particular emphasis on measurements relating to the propagation of partons in a colored medium.},
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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  • This contribution highlights recent results from the PHENIX Collaboration at RHIC. It covers global variables, flow and 2-particle correlations. A second contribution in this issue, by T.C.Awes, covers PHENIX results on heavy quarks, leptons and photons. PHENIX has collected a vast sample of data from p-p to Au-Au collisions at various energies. The data show that we have created a dense medium which affects the momenta and angular distributions of the produced particles. On the other hand it shows a strongly coupled flow which affects all produced particles, even heavy quarks. PHENIX has shown multiple new and more detailed resultsmore » at this conference and will with its current and future detector subsystems continue to uncover the details of this 'perfect liquid'.« less
  • We will review the latest physics developments from PHENIX concentrating on cold nuclear matter effects, the initial state for heavy-ion collisions, and probes of the earliest stages of the hot-dense medium created in those collisions. Recent physics results from p + p and d + Au collisions; and from direct photons, quarkonia and low-mass vector mesons in A+A collisions will be highlighted. Insights from these measurements into the characteristics of the initial state and about the earliest times in heavy-ion collisions will be discussed.
  • Much of the present experimental effort at RHIC is now directed towards understanding the properties of the hot and dense colored medium created in A+A collisions. Recent results from PHENIX on the dynamical evolution of the medium and its response to high momentum probes are presented, and their impact on our overall understanding of heavy-ion collisions is discussed.
  • This contribution highlights recent results from the PHENIX Collaboration at RHIC with emphasis on those obtained through lepton and photon measurements in PHENIX. Following the discovery of the surprising 'perfect liquid' properties of the dense matter being produced in heavy ion collisions at RHIC [1], effort has intensified to quantify the detailed characteristics of that matter. Photons and leptons are of special interest because they are penetrating probes that do not undergo strong interactions and therefore are unlikely to interact with the dense matter after their production. Thus, they carry information about the system at the time of their production,more » throughout the entire evolution of the collision. The PHENIX experiment at RHIC was designed with emphasis on the measurement of leptons and photons, with electron and photon identification at mid-rapidity, and muon spectrometers at forward and backward rapidities (see [2] for a description of PHENIX). As a result of their weaker electromagnetic coupling, lepton and photon production are rare processes that require large data samples for precise measurements. As a consequence of their low production rate the measurements are also subject to large backgrounds. In the case of directly radiated photons, the backgrounds are mostly photons from radiative decays of long-lived neutral mesons, predominantly the abundantly produced neutral pions. In the case of the electron measurement the background is mostly the internal or external conversion of these radiative decay photons into electron-position pairs, and in the case of the muon measurements it is the weak decay of charged pions into muons. With the 8th RHIC Run period recently completed, many of the new results reported by PHENIX are improved measurements of previously published results obtained from the smaller data sets of the earlier RHIC runs. This is particularly true of the lepton and photon measurements. As an example, due to the factor of 10 increase in the PHENIX Run 4 data sample compared to Run 2, the measurement of the neutral pion spectra in Au+Au collisions has been extended to nearly 20 GeV/c transverse momentum with decreased statistical and systematic errors [3]. This directly translates into improved direct photon and non-photonic electron measurements.« less