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Quenching and flow of charm and bottom quarks via semi-leptonic decay of D and B mesons in Pb+Pb collisions at the LHC

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Chinese Physics C 2024年第8期48卷 190-197页

作者： Shu-qing Li Wen-Jing Xing Shanshan Cao guang-you qin School of Physics and Electronic Engineering Jining UniversityQufu 273155China Institute of Frontier and Interdisciplinary Science Shandong UniversityQingdao 266237China Institute of Particle Physics and Key Laboratory of Quark and Lepton Physics(MOE) Central China Normal UniversityWuhan 430079China

Heavy flavor particles provide important probes of the microscopic structure and thermodynamic properties of the quark-gluon plasma(QGP)produced in high-energy nucleus-nucleus *** studied the energy loss and flow of charm and bottom quarks inside the QGP via the nuclear modification factor(R_(AA))and elliptic flow coefficient(v_(2))of their decayed leptons in heavy-ion collisions at the *** dynamical evolution of the QGP was performed using the CLVisc(3+1)-dimensional viscous hydrodynamics model;the evolution of heavy quarks inside the QGP was simulated with our improved Langevin model that considers both collisional and radiative energy loss of heavy quarks;the hadronization of heavy quarks was simulated via our hybrid coalescence-fragmentation model;and the semi-leptonic decay of D and B mesons was simulated via *** the same spatial diffusion coefficient for charm and bottom quarks,we obtained smaller R_(AA) and larger v_(2) of charm decayed leptons than bottom decayed leptons,indicating stronger energy loss of charm quarks than bottom quarks inside the QGP within our current model setup.

关键词： quark-gluon plasma heavy-ion collisions jet quenching anisotropic flow heavy quark heavy flavor muon

Heavy flavor quenching and flow:the roles of initial condition,pre-equilibrium evolution,and in-medium interaction

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Chinese Physics C 2020年第11期44卷 127-137页

作者： Shu-qing Li Wen-Jing Xing Feng-Lei Liu Shanshan Cao guang-you qin Department of Physics and Information Engineering Jining UniversityQufu 273155China Institute of Particle Physics and Key Laboratory of Quark and Lepton Physics(MOE) Central China Normal UniversityWuhan 430079China Cyclotron Institute Texas A&M UniversityCollege StationTexas77843USA Department of Physics and Astronomy Wayne State UniversityDetroitMichigan 48201USA Nuclear Science Division Lawrence Berkeley National LaboratoryBerkeleyCA 94720USA

Within an advanced Langevin-hydrodynamics framework coupled to a hybrid fragmentation-coalescence hadronization model,we study heavy flavor quenching and flow in relativistic heavy-ion *** investigate how the initial heavy quark spectrum,the in-medium energy loss and hadronization mechanisms of heavy quarks,the evolution profile of the pre-equilibrium stage,the medium flow,and the temperature dependence of heavy quark diffusion coefficients influence the suppression and elliptic flow of heavy mesons at the RHIC and the *** results show that the different modeling of initial conditions,pre-equilibrium evolution,and in-medium interactions can individually yield uncertainties of approximately 10-40% in D meson suppression and flow at a low transverse *** also find that proper combinations of collisional versus radiative energy loss,coalescence versus fragmentation in hadronization,and the inclusion of medium flow are the most important factors for describing the suppression and elliptic flow of heavy mesons.

关键词： quark-gluon plasma heavy-ion collisions jet quenching heavy quark

A discussion on the anomalous threshold enhancement of J/ψ–ψ(3770)couplings and X(6900)peak

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Chinese Physics C 2024年第4期48卷 1-5页

作者：陆业陈畅秦广友郑汉青 Institute of Particle Physics and Key Laboratory of Quark and Lepton Physics(MOE) Central China Normal UniversityWuhan 430079China Department of Physics Peking UniversityBeijing 100871China College of Physics Sichuan UniversityChengdu 610065China

The attractive interaction between J/ψandψ(3770)has to be strong enough if X(6900)is of the molecule *** argue that sinceψ(3770)decays predominantly into a DD^(¯)pair,the interactions between J/ψandψ(3770)may be significantly enhanced owing to the three point DD^(¯)loop *** enhancement originates from the anomalous threshold located at t=−1.288 GeV^(2),whose effect propagates into the s-channel partial wave amplitude in the vicinity of √s≃6.94 *** effect may be helpful in the formation of the X(6900)peak.

关键词： exotic hadrons hadron molecule X(6900)

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

通过相对论重粒子碰撞中的J/ψ产生揭秘胶子喷注淬火机制

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Science Bulletin 2023年第18期68卷 2003-2009,M0003页

作者：张善良廖劲峰秦广友王恩科邢宏喜 Key Laboratory of Atomic and Subatomic Structure and Quantum Control(MOE) Institute of Quantum MatterSouth China Normal UniversityGuangzhou 510006China guangdong Provincial Key Laboratory of Nuclear Science Institute of Quantum MatterSouth China Normal UniversityGuangzhou 510006China guangdong-Hong Kong Joint Laboratory of Quantum Matter Southern Nuclear Science Computing CenterSouth China Normal UniversityGuangzhou 510006China Physics Department and Center for Exploration of Energy and Matter Indiana UniversityBloomington 47408USA Key Laboratory of Quark&Lepton Physics(MOE)and Institute of Particle Physics Central China Normal UniversityWuhan 430079China Southern Center for Nuclear-Science Theory(SCNT) Institute of Modern PhysicsChinese Academy of SciencesHuizhou 516000China

长久以来,喷注淬火被认为是探测重离子碰撞中形成的夺克胶子等离子体的关键信号之一,尽管过去在喷注火研究方面已经付出了巨大的努力、但是区分夸克和胶子的喷注淬火仍然是一个非常大的挑战本文发现大横动量J/主要由胶子碎裂产生,因此... 详细信息

长久以来,喷注淬火被认为是探测重离子碰撞中形成的夺克胶子等离子体的关键信号之一,尽管过去在喷注火研究方面已经付出了巨大的努力、但是区分夸克和胶子的喷注淬火仍然是一个非常大的挑战本文发现大横动量J/主要由胶子碎裂产生,因此为探测胶子在热密介质中的能量损失提供了一个独特的敏感探针,作者首先基于领头幂次的NRQCD因子化理论计算了质子-质子碰撞中的大横动量J/产生,发现胶子碎裂是大横动量J/产生的主要机制,然后通过线性玻尔兹曼输运模型和相对论流体力学模拟了核-核碰撞中喷注与热密介质的相互作用,所得数值结果很好地描述了大横动量J/的核修正因子和椭圆流,揭示出胶子能量损失是大横动量J/产额压低的主要机制。作者进一步通过数据驱动的贝叶斯分析方法证实了这个新颖的结论,并定量提取出夸克胶子等离子体中的胶子能量损失分布。

关键词： Relativistic heavy-ion collisions Heavy quarkonium Jet quenching Elliptic flow

Fully Actuated System Approach for 6DOF Spacecraft Control Based on Extended State Observer

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Journal of Systems Science & Complexity 2022年第2期35卷 604-622页

作者： ZHAO qin DUAN guang-Ren Center for Control Science and Technology Southern University of Science and TechnologyShenzhen 518055China Center for Control Theory and Guidance Technology Harbin Institute of TechnologyHarbin 150001China

This paper deals with the problem of position and attitude tracking control for a rigid spacecraft.A fully actuated system(FAS)model for the six degree-of-freedom(6DOF)spacecraft motion is derived first from the state-space model by variable *** the uncertainties from external disturbance,unknown motion information,and uncertain inertia properties,an extended state observer(ESO)is designed to estimate the total ***,a tracking controller based on FAS approach is designed,and this makes the closed-loop system a constant linear one with an arbitrarily assignable *** solution to the parameter matrices of the observer and controller is given *** is proved via the Lyapunov stability theory that the observer errors and tracking errors both converge into the neighborhood of the ***,numerical simulation demonstrates the effectiveness of the proposed controller.

关键词： Constant linear closed-loop system extended state observer fully actuated system approach relative position and attitude control

p-adic Measures of Algebraic Independence for the Values of Ramanujan Functions and Klein Modular Functions

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Acta Mathematica Sinica,English Series 2007年第1期23卷 83-88页

作者： Tian qin WANG guang Shan XU Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100080 P. R. China Institute of Data and Knowledge Engineering Henan University Kaifeng 475001 P. R. China

In this paper, we give the p-adic measures of algebraic independence for the values of Ramanujan functions and Klein modular functions at algebraic points.

关键词： p-adic value Measure of algebraic independence Ramanujan function Klein modular function

Random Group Recommendation Model Based on Fuzzy Clustering

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Journal of Electronic Science and Technology 2020年第2期18卷 169-178页

作者： Zhe Ding Zhen qin Qi-Xu Wang Zhi-guang qin School of Information and Software Engineering University of Electronic Science and Technology of ChinaChengdu 610054

The group recommendation system is a viral requirement for the Internet service provider to provide recommendation services for all the users in a group. Due to the shared or different interests among users in the group, it is difficult for traditional personal recommendation algorithms to predict items that can meet the requirements of all the users in the group. In this paper, a random group recommendation model is proposed to recommend the top K most appealing items for all the users in a random group. By analyzing item ratings of all the users in the group, the recommendation model can abstract the group as a virtual user. Then a personal recommendation algorithm is applied to suggest the top K most appealing items for the virtual user. And the preference score and fuzzy clustering algorithm based on multiclass are applied to optimize the recommendation result of the group recommendation model. Finally, the Movie Lens-100 K dataset is applied to verify the efficiency of the recommendation model. The experimental results show that the items recommended by the proposed group recommendation model are more popular for all the users in the group than the items recommended by traditional group recommendation algorithms.

关键词： services app service

An analysis in metal barcode label design for reference

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Frontiers of Information Technology & Electronic Engineering 2016年第2期17卷 173-184页

作者： Yin ZHAO Hong-guang XU qin-yu ZHANG Communication Engineering Research Center Harbin Institute of Technology Shenzhen Graduate School

We employ nondestructive evaluation involving AC field measurement in detecting and identifying metal barcode labels,providing a reference for *** the magnetic scalar potential boundary condition at notches in thin-skin field theory and 2D Fourier transform,we introduce an analytical model for the magnetic scalar potential induced by the interaction of a high-frequency inducer with a metal barcode label containing multiple narrow saw-cut notches,and then calculate the magnetic field in the free space above the metal barcode *** the simulations of the magnetic field,qualitative analysis is given for the effects on detecting and identifying metal barcode labels,which are caused by metal material,notch characteristics,exciting inducer properties,and other factors that can be used in metal barcode label design as *** results are in good accordance with experiment results.

关键词： Metal barcode label Signal detection AC field measurement Internet of things