High-_PT Direct Photon Spectra and Azimuthal Anisotropy Measurements in 200 GeV Au+Au Collisions at RHIC-PHENIX

Conference · Tue Jan 01 00:00:00 EST 2008

OSTI ID:946119

Miki, Kentaro ^[1]; Awes, Terry C ^[2]; Cianciolo, Vince ^[2]; Efremenko, Yuri V ^[2]; Enokizono, Akitomo ^[3]; Hornback, Donald ^[4]; Read, Jr, Kenneth F ^[2]; Silvermyr, David O ^[2]; Sorensen, Soren P ^[4]; Stankus, Paul W ^[2]; Young, Glenn R ^[2]

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1. University of Tsukuba, Japan
2. ORNL
3. Lawrence Livermore National Laboratory (LLNL)
4. University of Tennessee, Knoxville (UTK)

Direct photons are a powerful probe to study the property of quark-gluon plasma (QGP) in high energy heavy-ion collisions. In non-central collisions, the anisotropy of the collision region produces the different pressure gradients and particle density that results in different anisotropy of particle emission, depending on the production processes of photons. Therefore, an azimuthal anisotropy parameter {upsilon}{sub 2} is a powerful tool to explore the source of direct photons. We report on the latest direct photon analysis of the nuclear modification factor in {radical}s{sub NN} = 200 GeV and 62.4 GeV Au + Au collisions, and {upsilon}{sub 2} at high p{sub T} in 200 GeV Au + Au collisions at RHIC-PHENIX (Run4). We also present the analysis status, using a larger statistics and better reaction plane information from a new detector available from RHIC Run7 data.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 946119
• Resource Relation: Conference: 20th International Conference on Nucleus Nucleus Collisions/Quark Matter 2008, Jaipur, India, 20080204, 20080210
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANISOTROPY
MODIFICATIONS
PHOTONS
PRESSURE GRADIENTS
PROBES
PRODUCTION
QUARK MATTER
SPECTRA
STATISTICS