Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 1997, Vol. 8 ›› Issue (1): 18

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Mathematical feature of photon spectra produced in ultra-relativistic heavy-ion collision

Ai Xiao-Bai(Ai Hsiao-Bai)   

  1. Shanghai Institute of Nuclear Research, the Chinese Academy of Sciences, Shanghai 201800
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Ai Xiao-Bai(Ai Hsiao-Bai). Mathematical feature of photon spectra produced in ultra-relativistic heavy-ion collision.Nuclear Science and Techniques, 1997, 8(1): 18

Abstract: In 1994 the first single-photon spectra from the 200 GeV/A S + Au collisions at CERN SPS were reported by WA80 group. Based on these data, it can be proved that as long as there is an instantancous thermal distribution T(r, τ) in an expanding fireball at each instant, the basic mathematical feature of various kinds of photon spectra is that photon yield is approximately an exponential function of the transverse momentum Pr in some region, which is basically irrelevant to the uncertainties enclosed in the theoretical estimations.

Key words: Relativistic hydrodynamics, Quark-Gluon plasma, Single -photon spectrum