Chinese Physics C > 2001, Vol. 25 > Issue(11): 1089-1091

A Circumstantial Evidence for the Possible Production of QGP in the 158A GeV/c Central Pb+Pb Collisions

China Institute of Atomic Energy,Beijing 102413,China

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Abstract：
Hadron and string cascade model (JPCIAE),based on the hypothesis without introducing the quark gluon plasma(QGP),is employed to study the direct photon and π 0 transverse momentum distributions for central ²⁰⁸Pb+ ²⁰⁸Pb collisions at 158A GeV/c. The theoretical results of transverse momentum distribution for both the direct photon and the π ⁰particle are lower than the data of WA98 experiment. However,JPCIAE model can ever explain successfully the results of WA80 and WA93 experiments of central S+Au collisions at 200A GeV/c where there is no evidence of direct photon excess. Having considered the results of WA80 and WA93 experiments can be explained but WA98's can't,that might provide a circumstantial evidence for the possible production of QGP in the high energy central Pb+Pb collisions.

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LIU Zhi-Yi, SA Ben-Hao and ZHOU Shu-Hua. A Circumstantial Evidence for the Possible Production of QGP in the 158A GeV/c Central Pb+Pb Collisions[J]. Chinese Physics C, 2001, 25(11): 1089-1091.

LIU Zhi-Yi, SA Ben-Hao and ZHOU Shu-Hua. A Circumstantial Evidence for the Possible Production of QGP in the 158A GeV/c Central Pb+Pb Collisions[J]. Chinese Physics C, 2001, 25(11): 1089-1091. shu

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Received: 2000-12-25
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

A Circumstantial Evidence for the Possible Production of QGP in the 158A GeV/c Central Pb+Pb Collisions

Corresponding author:LIU Zhi-Yi,

China Institute of Atomic Energy,Beijing 102413,China

Received Date:2000-12-25
Accepted Date:1900-01-01
Available Online:2001-11-05

Abstract:Hadron and string cascade model (JPCIAE),based on the hypothesis without introducing the quark gluon plasma(QGP),is employed to study the direct photon and π 0 transverse momentum distributions for central²⁰⁸Pb+²⁰⁸Pb collisions at 158A GeV/c. The theoretical results of transverse momentum distribution for both the direct photon and the π⁰particle are lower than the data of WA98 experiment. However,JPCIAE model can ever explain successfully the results of WA80 and WA93 experiments of central S+Au collisions at 200A GeV/c where there is no evidence of direct photon excess. Having considered the results of WA80 and WA93 experiments can be explained but WA98's can't,that might provide a circumstantial evidence for the possible production of QGP in the high energy central Pb+Pb collisions.