Measurements of Proton High-Order Cumulants in sNN=3 GeV Au+Au Collisions and Implications for the QCD Critical Point
Measurements of Proton High-Order Cumulants in sNN=3 GeV Au+Au Collisions and Implications for the QCD Critical Point
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sNN=3-GeV Au Au 碰撞中质子高阶累积量的测量及其对 QCD 临界点的影响
DOI：
10.1103/physrevlett.128.202303
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发表时间：
2022
影响因子：
8.6
通讯作者：
Ahammed, Z.
中科院分区：
文献类型：
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作者：
Abdallah, M. S.;Aboona, B. E.;Adam, J.;Adamczyk, L.;Adams, J. R.;Adkins, J. K.;Agakishiev, G.;Aggarwal, I.;Aggarwal, M. M.;Ahammed, Z.
本文报道了由星星实验测量的，在和内的快度（）和横动量（）的运动学接受度下，在的专用固定靶碰撞的质子多重数分布的累积量。在最中心的0%-5%碰撞中，质子累积比为C_4/C_2 =-0.85 0. 09（stat）±0.82（syst），无论从统计不确定度还是系统不确定度来看，都低于泊松基线。强子输运UrQMD模型再现了我们在测量的接受度。与高能计算结果和输运模型计算结果相比，这种抑制与重子数守恒驱动的涨落相一致，并表明了强子相互作用主导的能量区域.这些数据意味着，QCD临界区，如果在重离子碰撞中产生，只能存在于能量高于3 GeV。
We report cumulants of the proton multiplicity distribution from dedicated fixed-targetcollisions at, measured by the STAR experiment in the kinematic acceptance of rapidity () and transverse momentum () withinand. In the most central 0%–5% collisions, a proton cumulant ratio is measured to be C4/C2=-0.85±0.09 (stat)±0.82 (syst), which isbelow the Poisson baseline with respect to both the statistical and systematic uncertainties. The hadronic transport UrQMD model reproduces ourin the measured acceptance. Compared to higher energy results and the transport model calculations, the suppression inis consistent with fluctuations driven by baryon number conservation and indicates an energy regime dominated by hadronic interactions. These data imply that the QCD critical region, if created in heavy-ion collisions, could only exist at energies higher than 3 GeV.