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On hydrodynamical description of thermal photons

Contributors

Rasanen, Syksy

Published in

Nuclear physics. A, vol. 715, p. 717-725

Publication date

2003

Abstract

The WA98 collaboration in the CERN SPS has reported an excess of photons over those originating from the decays of final hadrons in the lead-lead collisions. These photons can originate either from primary interactions of partons from colliding nuclei or from secondary interactions among produced particles. Photons produced in the secondary interactions, often called thermal photons, can be calculated by using thermal production rates and equilibrium hydrodynamics for the evolution of the expanding matter. I will review the main features of hydrodynamical studies for the WA98 data. The data can be reproduced both with or without a phase transition to the QGP, but high initial temperature, over the values predicted for the phase transition temperature, is required by the data. I will also show a prediction for the photon excess for central gold-gold collisions at the Brookhaven RHIC collider. In this prediction, the initial state for the hydrodynamical expansion is obtained from a perturbative QCD calculation.

Note

Contribution to Quark Matter 2002, Nantes, France, July 18-24, 2002

UNIGE affiliation entities

Citation (ISO format)

RASANEN, Syksy. On hydrodynamical description of thermal photons. In: Nuclear physics. A, 2003, vol. 715, p. 717–725. doi: 10.1016/S0375-9474(02)01474-4

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Article (Accepted version)

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Journal ISSN

0375-9474
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Technical informations

Creation

04/09/2009 14:20:00

First validation

04/09/2009 14:20:00

Update

14/03/2023 15:11:12

Status update

14/03/2023 15:11:12

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