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Single photons, dileptons and hadrons from relativistic heavy ion collisions and quark-hadron phase transition

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Abstract

The production of single photons in Pb+Pb collisions at the CERN SPS as measured by the WA98 experiment is analysed. A quark gluon plasma is assumed to be formed initially, which expands, cools, hadronizes, and undergoes freeze-out. A rich hadronic equation of state is used and the transverse expansion of the interacting system is taken into account. The recent estimates of photon production in quark-matter (at two loop level) along with the dominant reactions in the hadronic matter leading to photons are used. About half of the radiated photons are seen to have a thermal origin. The same treatment and the initial conditions provide a very good description to hadronic spectra measured by several groups and the intermediate mass dileptons measured by the NA50 experiment, lending a strong support to the conclusion that quark gluon plasma has been formed in these collisions. Predictions for RHIC and LHC energies are also given.

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  1. Physics Group, Variable Energy Cyclotron Centre, 1/AF, Bidhan Nagar, 700 064, Kolkata, India

    Dinesh Kumar Srivastava

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  1. Dinesh Kumar Srivastava
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Srivastava, D.K. Single photons, dileptons and hadrons from relativistic heavy ion collisions and quark-hadron phase transition. Pramana - J Phys 57, 235–249 (2001). https://doi.org/10.1007/s12043-001-0035-7

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  • DOI: https://doi.org/10.1007/s12043-001-0035-7

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