Thermal Freeze-Out and Longitudinally Non-uniform Collective Expansion Flow in Relativistic Heavy Ion Collisions

FENG Sheng-Qin; LIU Feng; LIU Lian-Shou

Chinese Physics C> 2002, Vol. 26> Issue(12) : 1277-1284

Thermal Freeze-Out and Longitudinally Non-uniform Collective Expansion Flow in Relativistic Heavy Ion Collisions

Institute of Particle Physics, Huazhong Normal University, Wuhan 430079, China

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Abstract：
The non-uniform longitudinal flow model (NUFM) proposed recently is extended to include also the transverse flow. The resulting longitudinally non-uniform collective expansion model (NUCEM) is applied to the calculation of rapidity distribution of kaons, lambdas and protons in relativistic heavy ion collisions at CERN-SPS energies. The model results are compared with the 200A GeV/c S-S and 158 A GeV/c Pb-Pb collision data. The central dips observed in experiments are reproduced in a natural way. ;It is found that the depth of the central dip depends on the magnitude of the parameter e and the mass of produced particles, i.e. the non-uniformity of the longitudinal flow which is described by the parameter e determines the depth of the central dip for produced particles. Comparing with one-dimensional non-uniform longitudinal flow model, the rapidity distribution of lighter strange particle kaon also shows a dip due to the effect of transverse flow.

References

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FENG Sheng-Qin, LIU Feng and LIU Lian-Shou. Thermal Freeze-Out and Longitudinally Non-uniform Collective Expansion Flow in Relativistic Heavy Ion Collisions[J]. Chinese Physics C, 2002, 26(12): 1277-1284.

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Received: 2002-01-30
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

Thermal Freeze-Out and Longitudinally Non-uniform Collective Expansion Flow in Relativistic Heavy Ion Collisions

Corresponding author: FENG Sheng-Qin,

Institute of Particle Physics, Huazhong Normal University, Wuhan 430079, China

Received Date: 2002-01-30

Accepted Date: 1900-01-01

Available Online: 2002-12-05

Abstract: The non-uniform longitudinal flow model (NUFM) proposed recently is extended to include also the transverse flow. The resulting longitudinally non-uniform collective expansion model (NUCEM) is applied to the calculation of rapidity distribution of kaons, lambdas and protons in relativistic heavy ion collisions at CERN-SPS energies. The model results are compared with the 200A GeV/c S-S and 158 A GeV/c Pb-Pb collision data. The central dips observed in experiments are reproduced in a natural way. ;It is found that the depth of the central dip depends on the magnitude of the parameter e and the mass of produced particles, i.e. the non-uniformity of the longitudinal flow which is described by the parameter e determines the depth of the central dip for produced particles. Comparing with one-dimensional non-uniform longitudinal flow model, the rapidity distribution of lighter strange particle kaon also shows a dip due to the effect of transverse flow.

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Thermal Freeze-Out and Longitudinally Non-uniform Collective Expansion Flow in Relativistic Heavy Ion Collisions

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