PHENIX photons and dileptons - INSPIRE

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PHENIX photons and dileptons

PHENIX

Collaboration

•

Takao Sakaguchi
(
- Brookhaven
)

for the collaboration.

Dec, 2010

8 pages

Part of Proceedings, 4th International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions (Hard Probes 2010) : Eilat, Israel, October 10-15, 2010

Published in:

Nucl.Phys.A 855 (2011) 141-148

Contribution to:

- Hard Probes 2010

e-Print:

1012.1893 [nucl-ex]

DOI:

10.1016/j.nuclphysa.2011.02.030

Experiments:

BNL-RHIC-PHENIX

View in:

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Abstract: (Elsevier)

Electromagnetic probes such as dileptons and photons are useful to investigate the thermodynamical state of the early stages of heavy-ion collisions. The PHENIX experiment has measured both photons and dileptons in p + p , d +Au, and Au+Au collisions. An excess of dilepton yield over the expected hadronic contribution is seen in the mass region 0.2–0.8 GeV/ c 2 in Au+Au collisions, most prominently at low p T and in central collisions. Direct photons are measured through their internal conversion to electron pairs. We observe a large enhancement in Au+Au collisions over the p + p yield scaled by the number of binary collisions. The latest results from d +Au collisions show that this enhancement cannot be attributed to cold-nuclear-matter effects.

Note:

Proceedings for HardProbe 2010 conference held at Eilat, Israel in Oct 10-15, 2010

direct photons
heavy ion collisions
cold nuclear effect
hot dense medium
dilepton: yield
photon: direct production
enhancement
PHENIX

References(6)

Figures(21)

Formation of dense partonic matter in relativistic nucleus-nucleus collisions at RHIC: Experimental evaluation by the PHENIX collaboration

PHENIX

Collaboration

•

K. Adcox
(
- Vanderbilt U.
)

et al.

- Nucl.Phys.A 757 (2005) 184-283
•
e-Print:
- nucl-ex/0410003
•
DOI:
- 10.1016/j.nuclphysa.2005.03.086

Direct photon production in relativistic heavy-ion collisions

P. Stankus
(
- Oak Ridge
)

- Ann.Rev.Nucl.Part.Sci. 55 (2005) 517-554
•
DOI:
- 10.1146/annurev.nucl.53.041002.110533

Hadronic production of thermal photons

- Phys.Rev.C 69 (2004) 014903
•
e-Print:
- hep-ph/0308085
•
DOI:
- 10.1103/PhysRevC.69.014903

PHENIX detector overview

PHENIX

Collaboration

•

K. Adcox

et al.

- Nucl.Instrum.Meth.A 499 (2003) 469-479
•
DOI:
- 10.1016/S0168-9002(02)01950-2

Detailed measurement of the $e^+ e^-$ pair continuum in $p+p$ and Au+Au collisions at $\sqrt{s_{NN}} = 200$ GeV and implications for direct photon production

PHENIX

Collaboration

•

A. Adare
(
- Colorado U.
)

et al.

- Phys.Rev.C 81 (2010) 034911
•
e-Print:
- 0912.0244
•
DOI:
- 10.1103/PhysRevC.81.034911

Enhanced production of direct photons in Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV and implications for the initial temperature

PHENIX

Collaboration

•

A. Adare
(
- Colorado U.
)

et al.

- Phys.Rev.Lett. 104 (2010) 132301
•
e-Print:
- 0804.4168
•
DOI:
- 10.1103/PhysRevLett.104.132301