A Circumstantial Evidence for the Possible Production of QGP in the 158A GeV/c 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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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

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 π0 particle 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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