Photons from Pb-Pb collisions at ultrarelativistic energies

被引：57

作者：

Alam, JE ^{[1
]}

Sarkar, S

Hatsuda, T

Nayak, TK

Sinha, B

机构：

[1] Univ Tokyo, Dept Phys, Tokyo 1130033, Japan

[2] Bhabha Atom Res Ctr, Ctr Variable Energy Cyclotron, Kolkata 700064, W Bengal, India

[3] Saha Inst Nucl Phys, Kolkata 700064, W Bengal, India

来源：

PHYSICAL REVIEW C | 2001年 / 63卷 / 02期

关键词：

D O I：

10.1103/PhysRevC.63.021901

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

High energy photon emission rate from matter created in Pb + Pb collisions at CERN SPS energies is evaluated. The evolution of matter from the initial state up to freeze-out has been treated within the framework of (3 + 1) dimensional hydrodynamic expansion. We observe that the photon spectra measured by the WA98 experiment are well reproduced with hard QCD photons and photons from a thermal source with initial temperature similar to 200 MeV. The effects of the spectral changes of hadrons with temperature on the photon emission rate and on the equation of state are studied. Photon yield for Au + Au collisions at RHIC energies is also estimated.

引用

页数：5

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