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arXiv 1602.01564nucl-thhep-phnucl-ex
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来自爆炸波模型的Hanbury-Brown-Twiss半径与束流能量的关系

Beam energy dependence of Hanbury-Brown-Twiss radii from a blast-wave model

S. Zhang, Y. G. Ma, J. H. Chen, C. Zhong

摘要:

利用爆轰波模型计算了关联长度(Hanbury-Brown-Twiss半径)与束流能量的关系,计算结果与RHIC-STAR束流能量扫描数据和LHC-ALICE测量结果相当。通过拟合每个能量点的HBT半径,得到了一组作为所研究的光束能量的函数的爆炸波模型的参数。利用提取的参数,给出了$\sqrt{s_{NN}} = $ 200 GeV的Au + Au碰撞和2.76 TeV的Pb+Pb碰撞的横动量与HBT半径的关系.从我们的研究可以看出,在计算HBT半径时,粒子发射持续时间不能忽略。在RHIC-STAR实验中发现,在一定范围内调节动力学冻结温度将导致系统寿命沿相反方向变化。

英文摘要:

The beam energy dependence of correlation lengths (the Hanbury-Brown-Twiss radii) is calculated by using a blast-wave model and the results are comparable with those from RHIC-STAR beam energy scan data as well as the LHC-ALICE measurements. A set of parameter for the blast-wave model as a function of beam energy under study are obtained by fit to the HBT radii at each energy point. The transverse momentum dependence of HBT radii is presented with the extracted parameters for Au + Au collision at $\sqrt{s_{NN}} = $ 200 GeV and for Pb+Pb collisions at 2.76 TeV. From our study one can learn that particle emission duration can not be ignored while calculating the HBT radii with the same parameters. And tuning kinetic freeze-out temperature in a range will result in system lifetime changing in the reverse direction as it is found in RHIC-STAR experiment measurements.

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