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Collective flow and hydrodynamics in large and small systems at the LHC

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Nuclear Science and Techniques 2017年第7期28卷 1-28页

作者： huichao song You Zhou Katarína Gajdosová Department of Physics and State Key Laboratory of Nuclear Physics and Technology Peking University Beijing 100871 China Collaborative Innovation Center of Quantum Matter Beijing 100871 China Center for High Energy Physics Peking UniversityBeijing 100871 China Niels Bohr Institute University of Copenhagen Blegdamsvej 17 2100 Copenhagen Denmark

In this article,we briefly review the recent progress on collective flow and hydrodynamics in large and small systems at the Large Hadron Collider(LHC),which includes the following topics:extracting the QGP viscosity from the flow data,initial-state fluctuations and final-state correlations at 2.76 A TeV Pb-Pb collisions,correlations,and collective flow in high-energy p-Pb and p-p collisions.

关键词：流体力学小型系统大型强子对撞机集体流流动初始状态数据提取 LHC

Universal scaling of conserved charge in stochastic diffusion dynamics

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Chinese Physics C 2019年第8期43卷 109-116页

作者： Shanjin Wu huichao song Department of Physics and State Key Laboratory of Nuclear Physics and Technology Peking UniversityBeijing 100871China Collaborative Innovation Center of Quantum Matter Beijing 100871China Center for High Energy Physics Peking UniversityBeijing 100871China

We explore the Kibble-Zurek scaling of conserved charge using stochastic diffusion dynamics. The characteristic scales τKZ and lKZ are determined and used to properly rescale the traditional correlation function and cumulant. We construct universal functions for the two-point correlation C(y1-y2;τ)and the second-order cumulant K(△y,τ) of the conserved charge in the critical regime, both of which are, near the critical point, insensitive to both the initial temperature and a parameter in the mapping between the 3D Ising model and the hot QCD system.

关键词： critical point QGP relativistic heavy-ion collisions

Collective flow and fluid behavior in p/d/^(3)He+Au collisions at√s_(NN)=200 GeV

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Chinese Physics C 2024年第10期48卷 185-192页

作者： Zeming Wu Baochi Fu Shujun Zhao Runsheng Liu huichao song School of Physics Peking UniversityBeijing 100871China Collaborative Innovation Center of Quantum Matter Beijing 100871China Center for High Energy Physics Peking UniversityBeijing 100871China

By varying the intrinsic initial geometry,p/d/^(3)He+Au collisions at the Relativistic Heavy Ion Collider(RHIC)provide a unique opportunity to understand the collective behavior and probe possible sub-nucleon fluctuations in small *** this study,we employed the hybrid model under TRENTo initial conditions to study the collective flow and fluid behavior in p/d/^(3)He+Au *** fine-tuned parameters,iEBE-VISHNU can describe the v_(2)(pT) and v_(3)(pT) data from the PHENIX and STAR ***,for certain parameter sets with initial sub-nucleon fluctuations,the hydrodynamic simulations already go beyond their limits with an average Knudsen number clearly larger than *** calculations demonstrate that,for a meaningful evaluation of the fluid behavior in small systems,model simulations must also pay attention to the validity range of hydrodynamics.

关键词： heavy-ion collisions hydrodynamics collective flow

Non-equilibrium Cumulants within Model A near QCD Critical End Point

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IMP & HIRFL Annual Report 2019年第1期 34-35页

作者： Chao Jingyi Jiang Lijia song huichao Wu Shanjin 不详

The existence and location of the QCD critical point are important topics for the QCD phase diagram,which has drawn attention from both theorists and experimentalists for *** calculations based on thermal equilibrium assumption predicts that high order cumulants of nal state particles emitted from reball will increase dramatically.

关键词： equilibrium QCD assumption

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QCD临界点附近的动力学临界涨落

核技术 2023年第4期46卷 47-61页

作者：吴善进宋慧超北京大学高能物理研究中心北京100871 北京大学物理学院北京100871 核物理与核技术国家重点实验室北京100871

探寻量子色动力学(Quantum Chromodynamics,QCD)相图的临界点是相对论重离子碰撞实验低能量扫描(Beam Energy Scan program in Relativistic Heavy-Ion Collisions,RHIC-BES)项目的重要实验目标。初步的实验探测发现了净质子数涨落随着对撞能量的非单调行为,定性上符合基于静态模型的理论预言,这暗示着QCD临界点的存在。由于相对论重离子碰撞是一个高速膨胀的体系,动力学效应能显著地改变QCD临界点附近的临界涨落。为最终确定QCD临界点的存在以及研究QCD在有限温有限密区域的相结构,人们发展了一系列QCD临界点附近的动力学模型。本文回顾了近年来关于寻找QCD临界点在实验测量和理论模型的进展,着重强调在临界点及一级相变区域动力学模型的发展和挑战。

关键词： QCD相图及相变相对论重离子碰撞低能量扫描动力学模型

Physics perspectives of heavy-ion collisions at very high energy

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Science China(Physics,Mechanics & Astronomy) 2016年第2期59卷 1-27页

作者： Ning-bo Chang ShanShan Cao Bao-yi Chen Shi-yong Chen Zhen-yu Chen Heng-Tong Ding Min He Zhi-quan Liu Long-gang Pang Guang-you Qin Ralf Rapp Bjorn Schenke Chun Shen huichao song Hao-jie Xu Qun Wang Xin-Nian Wang Ben-wei Zhang Han-zhong Zhang XiangRong Zhu Peng-fei Zhuang Key Laboratory of Quark and Lepton Physics (MOE) and Institute of Particle Physics Central China Normal University Wuhan 430079 China Nuclear Science Division MS70R0319 Lawrence Berkeley National Laboratory Berkeley 94720 USA Physics Department Tsinghua University Beijing 100084 China Department of Applied Physics Nanjing University of Science and Technology Nanjing 210094 China Cyclotron Institute and Department of Physics and Astronomy Texas A&M University College Station TX 77843 USA Physics Department Brookhaven National Laboratory Upton New York 11973 USA Department of Physics McGill University Montreal Quebec H3A 2T8 Canada Department of Physics and State Key Laboratory of Nuclear Physics and Technology Peking University Beijing 100871 China Department of Modern Physics University of Science and Technology of China Hefei 230026 China

Heavy-ion collisions at very high colliding energies are expected to produce a quark-gluon plasma(QGP) at the highest temperature obtainable in a laboratory setting. Experimental studies of these reactions can provide an unprecedented range of information on properties of the QGP at high temperatures. We report theoretical investigations of the physics perspectives of heavy-ion collisions at a future high-energy collider. These include initial parton production, collective expansion of the dense medium, jet quenching,heavy-quark transport, dissociation and regeneration of quarkonia, photon and dilepton production. We illustrate the potential of future experimental studies of the initial particle production and formation of QGP at the highest temperature to provide constraints on properties of strongly interaction matter.

关键词： quark-gluon plasma heavy-ion collisions QCD phase transition properties of QGP

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机器学习在相对论重离子碰撞中的应用

中国科学：物理学、力学、天文学 2022年第5期52卷 3-15页

作者：周蒙罗逸群宋慧超北京大学物理学院核物理与核技术国家重点实验室北京100871

近年来机器学习领域在硬件和算法上均有长足的发展,并作为一种大数据分析方法获得了广泛的应用.其中,机器学习在物理学方面的应用也逐渐热门起来.本文综述了机器学习的各类模型在相对论重离子碰撞物理研究中的应用,包括碰撞参数预测、... 详细信息

近年来机器学习领域在硬件和算法上均有长足的发展,并作为一种大数据分析方法获得了广泛的应用.其中,机器学习在物理学方面的应用也逐渐热门起来.本文综述了机器学习的各类模型在相对论重离子碰撞物理研究中的应用,包括碰撞参数预测、核形变参数预测、相变分类、流体演化模拟等.其中涉及的机器学习模型既包括集成学习、主成分分析等经典机器学习模型,也包括卷积神经网络、点云网络等深度学习模型.由于机器学习出色的性能和运算效率,它在相对论重离子碰撞物理中的应用将获得越来越多的关注.

关键词：机器学习深度学习相对论重离子碰撞物理

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基于STC 89C 52的计算器设计与仿真

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科技创新导报 2015年第29期12卷 159-160,162页

作者：宋慧超内蒙古民族大学物理与电子信息学院内蒙古通辽028000

单片机具有体积小、控制功能强、功耗低、环境适应能力强、扩展灵活和使用方便等优点,已广泛应用在生活的各个领域,该文提出一种基于单片机的高精度计算器设计方案,核心控制系统采用STC89C52单片机,利用LCD1602液晶显示屏显示运算过程... 详细信息

单片机具有体积小、控制功能强、功耗低、环境适应能力强、扩展灵活和使用方便等优点,已广泛应用在生活的各个领域,该文提出一种基于单片机的高精度计算器设计方案,核心控制系统采用STC89C52单片机,利用LCD1602液晶显示屏显示运算过程与结果,设计4×4键盘构成按键模块,用来模拟0~9及加、减、乘、除、清零按键。软件程序利用单片机C语言编写,并在Keil C51开发环境下编译,硬件系统通过proteus工具软件设计并仿真。

关键词：单片机 4×4键盘 LCD1602

一种新型用于智能服装的FBG嵌入式人体温度检测算法

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传感技术学报 2009年第7期22卷 1045-1049页

作者：宋慧超苗长云张诚李鸿强徐钒婕天津工业大学通信与信息工程学院天津300160

研究了智能服装人体温度的检测。通过可调谐Fabry-Perot滤波器,实现了波长的解调,首先对数据进行FBG反射波加窗、加权平均,然后用最小二乘法对F-P滤波器的特性曲线拟合。实验表明,在相同精度条件下该算法的采样点数比传统算法减少了10... 详细信息

研究了智能服装人体温度的检测。通过可调谐Fabry-Perot滤波器,实现了波长的解调,首先对数据进行FBG反射波加窗、加权平均,然后用最小二乘法对F-P滤波器的特性曲线拟合。实验表明,在相同精度条件下该算法的采样点数比传统算法减少了10倍。基于该算法实现的人体温度检测系统的精度可达0.10C,温度采样频率为1Hz。因此本文的方法适用于在嵌入式系统中对Bragg波长的解调。

关键词：光纤Bragg光栅波长解调 Fabry-Perot滤波智能服装