论文标题
搜索在cern sps的核核碰撞中强烈相互作用物质的临界点
Searching for the critical point of strongly interacting matter in nucleus-nucleus collisions at CERN SPS
论文作者
论文摘要
搜索强烈相互作用物质的临界点（CP）的实验签名是CERN SPS的Na61/Shine实验的主要目标之一。在实验过程中，进行了光束动量和系统尺寸扫描。横向动量空间中的局部质子密度波动代表手性相变的顺序参数，并有望根据CP附近的通用幂律进行扩展；我们通过对横向动量空间中质子第二缩阶段阶段力矩（SSFM）的间歇性分析来探测他们的行为。以前的这样的分析表明，Na49 Si+Si碰撞的幂律行为为158 $ a $ gev/$ c $，在相同能量的较轻或较重的Na49＆na61/Shine Systems中没有观察到的间歇性。现在，我们将分析扩展到Na61/Shine AR+SC碰撞，处于150 $ a $ GEV/$ C $，大小类似于Na49 Si+Si。我们采用统计技术来减去非关键背景以及估计统计和系统不确定性。随后，我们使用蒙特卡洛模拟来评估观察到的间歇性效应的统计意义。
The search for experimental signatures of the critical point (CP) of strongly interacting matter is one of the main objectives of the NA61/SHINE experiment at CERN SPS. In the course of the experiment, a beam momentum and system size scan is performed. Local proton density fluctuations in transverse momentum space represent an order parameter of the chiral phase transition and are expected to scale according to a universal power-law in the vicinity of the CP; we probe their behavior through an intermittency analysis of the proton second scaled factorial moments (SSFMs) in transverse momentum space. Previous such analyses revealed power-law behavior in NA49 Si+Si collisions at 158$A$ GeV/$c$, with no intermittency observed in lighter or heavier NA49 & NA61/SHINE systems at the same energy. We now extend the analysis to NA61/SHINE Ar+Sc collisions at 150$A$ GeV/$c$, similar in size and baryochemical potential to NA49 Si+Si. We employ statistical techniques to subtract non-critical background and estimate statistical and systematic uncertainties. Subsequently, we use Monte Carlo simulations to assess the statistical significance of the observed intermittency effect.
