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Event plane determination from the zero degree calorimeter at the cooling storage ring external-target experiment

Nuclear Science and Techniques 2023年第7期34卷 113-121页

作者： Li-Ke Liu Hua Pei Ya-Ping Wang Biao Zhang Nu Xu Shu-Su Shi Key Laboratory of Quark and Lepton Physics(MOE)and Institute of Particle Physics Central China Normal UniversityWuhan 430079China

The Cooling Storage Ring external-target experiment(CEE)spectrometer is used to study the nuclear matter created in heavy-ion collisions at√sNN=2.1-2.4 GeV with the aim to reveal the quantum chromodynamics phase structure in the high-baryon-density region.Collective flow is considered an effective probe for evaluating the properties of media during high-energy nuclear collisions.One of the main functions of the zero-degree calorimeter(ZDC),a subdetector system in the CEE,is to determine the reaction plane in heavy-ion collisions.This step is crucial for measuring the collective flow and other reaction-plane-related analyses.In this paper,we illustrate the procedures for event plane determination using the ZDC.Finally,isospin-dependent quantum molecular dynamics model-based predictions of the rapidity dependence of the directed and elliptical flows for p,d,t,3He,and 4He,produced in 2.1 GeV U+U collisions,are presented.

关键词： QCD phase structure Heavy-ion collisions Collective flow reaction plane Zero-degree calorimeter

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Varying the chiral magnetic effect relative to flow in a single nucleus-nucleus collision

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Chinese Physics C 2018年第8期42卷 130-136页

作者：徐浩洁赵杰王小保李汉林林子威沈彩万王福强 School of Science Huzhou University Department of Physics and Astronomy Purdue UniversityWest Lafayette College of Science Wuhan University of Science and Technology Department of Physics East Carolina University Key Laboratory of Quarks and Lepton Physics (MOE) and Institute of Particle Physics Central China Normal University Department of Physics and Astronomy Purdue University

We propose a novel method to search for the chiral magnetic effect（cme） in heavy ion collisions.We argue that the relative strength of the magnetic field（mainly from spectator protons and responsible for the cme）with respect to the reaction plane and the participant plane is opposite to that of the elliptic flow background arising from the fluctuating participant geometry.This opposite behavior in a single collision system,hence with small systematic uncertainties,can be exploited to extract the possible cme signal from the flow background.The method is applied to existing data from rhic,and the outcome discussed.

关键词： heavy ion collision chiral magnetic effect charge separation reaction plane participant plane eventplane

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