Transverse mass distributions in central heavy-ion collisions at high energies

• Published in: Chinese physics C Vol. 35; no. 4; pp. 355 - 362
• Main Author: 谢文杰 杨德 王翠平 王志刚
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.04.2011; Department of Physics, Yuncheng University, Yuncheng 044000, China%Department of Mathematics and Physics, Hebei Institute of Architecture and Civil Engineering, Zhangjiakou 075000, China%Institute of High Energy Physics, CAS, Beijing 100049, China
• Subjects: Collisions; Emission; Kaons; Lambda; Lead (metal); Mass distribution; Pictures; Pions; Synchrotrons; 实验数据; 横质量分布; 温排放; 计算结果; 质子同步加速器; 重离子碰撞; 高能量; transverse mass spectra; heavy-ion collisions; one-temperature emission picture; two-temperature emission picture
• ISSN: 1674-1137; 0254-3052; 2058-6132
• DOI: 10.1088/1674-1137/35/4/007

The transverse mass spectra of protons, pions, kaons, Lambda and Antilambda produced in central nucleus-nucleus collisions at high energies are described by using one-temperature and two-temperature emission pictures. The calculated results are compared and found to be in good agreement with the experimental data of the E895, E866 and E917 Collaborations measured in central Au-Au collisions at the Alternating Gradient Synchrotron （AGS） energies and the NA49 Collaboration measured in central Pb-Pb collisions at the Super Proton Synchrotron （SPS） energies. It is demonstrated that the transverse mass distributions of protons, kaons, Lambda and Antilambda, except for Lambda hyperons produced in central Pb-Pb collisions at 158 A GeV, can be described by using the one-temperature emission picture, and for pions, we need to use the two-temperature emission picture.