Λ Production and Λ/p Ratio in Relativistic Heavy Ion Collisions

LU ZhongDao; SA BenHao; Masanori Matsuda; Junichi Nagata; Atsushi Nakamura; Osamu Miyamura

Chinese Physics C> 2000, Vol. 24> Issue(8) : 743-747

Λ Production and Λ/p Ratio in Relativistic Heavy Ion Collisions

The China Center of Advance Science and Technology CCAST, Beijing 100080, China2 China Institute of Atomic Energy, Beijing 102413, China3 Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator of Lanzhou, Lanzhou 730000, China4 Faculty of Integrated Art and Science, Hiroshima University, Japan5 Faculty of Science, Hiroshima University, Japan

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Abstract：
The Λ multiplicity and Λ/p ratio are studied by hadron transportation-string fragmentation model in relativistic heavy ion collisions. Firstly, the dependence of Λ multiplicity and Λ/p ratio on the system size and the collision centrality is studied. It shows that the Λ and p multiplicities go up as the increase of system size and the increase of collision centrality. However, their ratio keeps almost a constant. The effect of Λ annihilation cross section to Λ multiplicity and Λ/p ratio is also studied. It is found that this effect is weak: Λ multiplicity and Λ/p ratio have a little amount of increase by the decrease of Λ annihilation cross section. Even the cross section is down to zero, Λ/p ratio is only 1.2 in 200A GeV AuAu head on collision. The Λ/p ratio is obtained to be 0.28 in pp collision, lying in the range of experimental data:0.2—0.3. It is also obtained that the ratio in AA collisions is 3—5 times of that in pp collision.

References

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LU ZhongDao, SA BenHao, Masanori Matsuda, Junichi Nagata, Atsushi Nakamura and Osamu Miyamura. Λ Production and Λ/p Ratio in Relativistic Heavy Ion Collisions[J]. Chinese Physics C, 2000, 24(8): 743-747.

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Received: 1999-06-16
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

Λ Production and Λ/p Ratio in Relativistic Heavy Ion Collisions

Corresponding author: LU ZhongDao,

The China Center of Advance Science and Technology CCAST, Beijing 100080, China2 China Institute of Atomic Energy, Beijing 102413, China3 Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator of Lanzhou, Lanzhou 730000, China4 Faculty of Integrated Art and Science, Hiroshima University, Japan5 Faculty of Science, Hiroshima University, Japan

Received Date: 1999-06-16
Accepted Date: 1900-01-01
Available Online: 2000-08-05

Abstract: The Λ multiplicity and Λ/p ratio are studied by hadron transportation-string fragmentation model in relativistic heavy ion collisions. Firstly, the dependence of Λ multiplicity and Λ/p ratio on the system size and the collision centrality is studied. It shows that the Λ and p multiplicities go up as the increase of system size and the increase of collision centrality. However, their ratio keeps almost a constant. The effect of Λ annihilation cross section to Λ multiplicity and Λ/p ratio is also studied. It is found that this effect is weak: Λ multiplicity and Λ/p ratio have a little amount of increase by the decrease of Λ annihilation cross section. Even the cross section is down to zero, Λ/p ratio is only 1.2 in 200A GeV AuAu head on collision. The Λ/p ratio is obtained to be 0.28 in pp collision, lying in the range of experimental data:0.2—0.3. It is also obtained that the ratio in AA collisions is 3—5 times of that in pp collision.