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质心能量200 GeV d+Au碰撞粒子 横动量谱的Tsallis统计分析

Study on the transverse-momentum spectra in 200 GeV d+Au collisions with the Tsallis statistics

  • 摘要: 用基于非广延热力学Tsallis统计的爆炸波(Tsallis blast-wave,TBW)模型研究了RHIC能区200 GeV质心能量氘核-金核(d+Au)碰撞系统中心快度区和前(后)向快度区轻强子和J/Ψ的横动量谱.在全动量区间,TBW模型可以很好地描述粒子谱.分析结果表明,200 GeV d+Au中心碰撞中平均径向流不为零,其大小介于同能量的质子-质子(p+p)与金核-金核(Au+Au)碰撞系统之间,d+Au碰撞中存在显著的冷核物质(cold nuclear matter, CNM)效应.J/Ψ在中心快度区径向流为零,而在后向快度区具有非零的径向流,可能预示在d+Au碰撞系统中已探测到色玻璃凝聚(color glass condensate,CGC)效应.

     

    Abstract: The blast-wave model based on the Tsallis statistics (TBW model) was used to study the particle production in 200 GeV d+Au collisions at RHIC. Light hadrons and J/Ψ transverse-momentum spectra at both mid-rapidity and forward/backward rapidity were analyzed. It was found that a non-zero radial flow for light hadrons, indicating a strong cold nuclear matter (CNM) effect in d+Au collisions. J/Ψ shows a finite radial flow at the backward rapidity. This result may imply the onset of initial state color glass condensate (CGC) in the d+Au collision system.

     

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