论文标题
在$ \ Mathbf {au+au} $ collisionS中的收费的触发生产$ \ Mathbf {\ sqrt {\ s_ {s_ {nn}}} $ = 2.4 $ \ mathbf {gev} $
Charged pion production in $\mathbf{Au+Au}$ collisions at $\mathbf{\sqrt{s_{NN}}}$ = 2.4$\mathbf{GeV}$
论文作者
论文摘要
我们介绍了$ \ sqrt {s _ {\ rm {nn}}} $ = 2.4 Gev(对应于0-40 $ \%contrionisations的四个中心级别的$ \ sqrt {s _ {\ rm {nn}}} $ = 2.4 gev(对应于$ \ sqrt {s _ {\ rm {nn}}} $ = 2.4 gev(对应于0-40 $ \%contrionise的四个集中)。将数据分析为横向动量,横向质量,速度和极角的函数。每个参与核子的Pion多样性随着中心性的增加而中度降低。即使对于最中心的事件类别,极性角分布也被发现是非异端的。我们关于pion多样性的结果非常适合世界数据的一般趋势,但是从略低的梁能量中测量的FOPI实验中的$2.5σ$数据。我们将数据与最先进的传输模型计算(PHSD,IQMD,PHQMD,GIBUU和SMASH)进行比较,并在测量和这些计算结果之间找到了实质性差异。
We present high-statistic data on charged pion emission from Au+Au collisions at $\sqrt{s_{\rm{NN}}}$ = 2.4 GeV (corresponding to $E_{beam}$ = 1.23 A GeV) in four centrality classes in the range 0 - 40$\%$ of the most central collisions. The data are analyzed as a function of transverse momentum, transverse mass, rapidity, and polar angle. Pion multiplicity per participating nucleon decreases moderately with increasing centrality. The polar angular distributions are found to be non-isotropic even for the most central event class. Our results on pion multiplicity fit well into the general trend of the world data, but undershoot by $2.5 σ$ data from the FOPI experiment measured at slightly lower beam energy. We compare our data to state-of-the-art transport model calculations (PHSD, IQMD, PHQMD, GiBUU and SMASH) and find substantial differences between the measurement and the results of these calculations.