在CERN的NA61/SHINE实验中，$\u221a{s_{\textrm{NN}}} = 16.84$ GeV的Be+Be碰撞中的双π介子费米子关联测量
Two-pion femtoscopic correlations in Be+Be collisions at $\sqrt{s_{\textrm{NN}}} = 16.84$ GeV measured by the NA61/SHINE at CERN
AI总结：
该研究通过NA61/SHINE实验测量Be+Be碰撞中的双π介子HBT关联，发现Lévy指数α近似恒定且远离高斯或临界值，半径参数随横向质量略降，截距参数趋势与RHIC不同。
摘要：
本文报告了在CERN SPS加速器上，由NA61/SHINE实验在束流动量150$A\\,\mbox{GeV}/\textit{c}$下，对Be+Be碰撞中双π介子玻色-爱因斯坦（HBT）关联的测量结果。所获得的动量空间关联函数可以很好地用Lévy分布源模型描述。文中给出了Lévy源参数的横向质量依赖性，并讨论了其可能的理论解释。结果表明，Lévy指数$α$作为$m_{\rm{T}}$的函数近似恒定，且远离高斯情形（$α= 2$）或临界端点处推测值（$α= 0.5$）。半径尺度参数$R$随$m_{\rm{T}}$略有减小，这可解释为横向流动的特征。最后，观察到截距参数$λ$作为$m_{\rm{T}}$的函数近似恒定，这与RHIC的测量结果不同。
英文摘要：
This paper reports measurements of two-pion Bose-Einstein (HBT) correlations in Be+Be collisions at a beam momentum of 150$A\,\mbox{GeV}/\textit{c}$ by the $\mbox{NA61/SHINE}$ experiment at the CERN SPS accelerator. The obtained momentum space correlation functions can be well described by a Lévy distributed source model. The transverse mass dependence of the Lévy source parameters is presented, and their possible theoretical interpretations are discussed. The results show that the Lévy exponent $α$ is approximately constant as a function of $m_{\rm{T}}$ , and far from both the Gaussian case of $α= 2$ or the conjectured value at the critical endpoint, $α= 0.5$. The radius scale parameter $R$ shows a slight decrease in $m_{\rm{T}}$, which can be explained as a signature of transverse flow. Finally, an approximately constant trend of the intercept parameter $λ$ as a function of $m_{\rm{T}}$ was observed, different from measurement results at RHIC.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
