Femtoscopy at NA61/SHINE using symmetric Lévy sources in central $^{40}$Ar+$^{45}$Sc from 40$A$ GeV/$c$ to 150$A$ GeV/$c$

Barnabas Porfyfor the NA61/SHINE Collaboration
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Abstract

In the recent decades of high energy physics research, it was demonstrated that strongly interacting quark-gluon plasma (sQGP) is created in ultra-relativistic nucleus-nucleus collisions. Investigation and understanding of properties of the hadronic matter is among the important goals of NA61/SHINE collaboration at CERN SPS. Mapping of the phase diagram is achieved by varying the collision energy (5 GeV $<\sqrt{s_{\textrm{NN}}}<$17 GeV) and by changing the collision system (p+p, p+Pb, Be+Be, Ar+Sc, Xe+La, Pb+Pb). We report on the measurement of femtoscopic correlations in intermediate system at intermediate SPS energies. Interpreting the results of measurements within the symmetric L\'evy source formalism, we discuss the values of L\'evy source parameters as a function of average pair transverse mass. One of the physical parameters is particularly important, the L\'evy exponent $\alpha$, which describes the shape of the source and may be related to the critical exponent $\eta$ in the proximity of the critical point. Therefore, measuring it may shed light on the location of the critical endpoint of the QCD phase diagram.
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在 NA61/SHINE 使用中心 $^{40}$Ar+$^{45}$Sc 从 40$A$ GeV/$c$ 到 150$A$ GeV/$c$ 的对称莱维源进行雌镜研究
在近几十年的高能物理研究中,已经证明强相互作用夸克-胶子等离子体(sQGP)是在超相对论核-核碰撞中产生的。研究和了解强子物质的特性是欧洲核子研究中心空间站的 NA61/SHINE 合作的重要目标之一。相图的绘制是通过改变碰撞能量(5 GeV
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