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Anisotropy flows in Pb-Pb collisions at LHC energies from parton scatterings with heavy quark trigger

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Nuclear Science and Techniques 2022年第2期33卷 14-20页

作者： Hai Wang Jin-Hui Chen Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China

By implementing an additional heavy quark-antiquark pair production trigger in a multiphase transport(AMPT)model,we study the effect on anisotropy flows of identified particles with a focus on charged particles and quarkonium(J/ΨandΥ).A systematic increase in the collision rate for active partons in the AMPT model with such an implementation has been observed.It leads to a slight increase of identified particles anisotropy flows as a function of transverse momentum(pT)and rapidity,and gives a better description of the experimental data of elliptic flow toward larger pT.Our approach provides an efficient way to study the heavy quark dynamics in the AMPT model at LHC energies.

关键词： Heavy-ion collision quark-gluon plasma quarkonium Collective flow

Investigating color screening in proton-nucleus collisions with complex potentials

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Chinese Physics C 2022年第11期46卷 203-211页

作者：文流渊杜晓健施舒哲陈保义 Department of Physics Tianjin UniversityTianjin 300350China Fakultat fur Physik Universitat BielefeldD-33615 BielefeldGermany Center for Nuclear Theory Department of Physics and AstronomyStony Brook UniversityStony BrookNew York11784USA

Color screening and parton inelastic scattering modify the heavy-quark antiquark potential in mediums consisting of particles from quantum chromodynamics(QCD),leading to the suppression of quarkonium production in relativistic heavy-ion collisions.Owing to the small charm/anti-charm(cc)pair production number in proton-nucleus(pA)collisions,the correlation between different cc pairs is negligible,which makes the Schrödinger equation viable for tracking the evolution of only one cc pair.We employ the time-dependent Schrödinger equation with an in-medium cc potential to study the evolution of charmonium wave functions in a hydrodynamic-like QCD medium produced in pA collisions.We explore different parametrizations of real and imaginary parts of the cc potential and calculate the nuclear modification factors(R_(pA))of J/ψ and ψ(2S)in √s_(NN)=5.02 TeV energy p-Pb collisions at the Large Hadron Collider(LHC).Comparing strong and weak screening scenarios with experimental data in this approach,we arrive at the conclusion that color screening is weak at temperatures close to the deconfined phase transition.Moreover,the imaginary part of the potential is crucial in describing the experimental data,which is consistent with widely studied semi-classical approaches,where dissociation rates are essential.

关键词： heavy-ion collision quarkonium dissociation quark-gluon plasma Schrödinger equation

Entropic destruction of heavy quarkonium in a rotating hot and dense medium from holography

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Chinese Physics C 2022年第11期46卷 100-105页

作者：武苹苹张自强朱祥荣 School of Physics and Electronic Information Engineering Henan Polytechnic UniversityJiaozuo 454000China School of Mathematics and Physics China University of GeosciencesWuhan 430074China School of Science Huzhou UniversityHuzhou 313000China

Previous studies have indicated that the peak of the quarkonium entropy at the deconfinement transition can be related to the entropic force,which would induce the dissociation of heavy quarkonium.In this study,we investigated the entropic force in a rotating hot and dense medium using AdS/CFT correspondence.It was found that the inclusion of angular velocity increases the entropic force,thus enhancing quarkonium dissociation,while chemical potential has the same effect.The results imply that the quarkonium dissociates easier in rotating medium compared with the static case.

关键词： AdS/CFT quark-gluon plasma quarkonium dissociation

Effects of the formation time of parton shower on jet quenching in heavy-ion collisions

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Chinese Physics C 2023年第2期47卷 157-164页

作者：张梦雪何杨曹杉杉易立 Institute of Frontier and Interdisciplinary Science Shandong UniversityQingdao 266237China Key Laboratory of Particle Physics and Particle Irradiation of Ministry of Education Shandong UniversityQingdao 266237China

Jet quenching has successfully served as a hard probe to study the properties of quark-gluon plasma(QGP).As a multi-particle system,jets require time to develop from a highly virtual parton to a group of partons close to mass shells.In this study,we present a systematical analysis on the effects of this formation time on jet quenching in relativistic nuclear collisions.Jets from initial hard scatterings were simulated with Pythia,and their interactions with QGP were described using a Linear Boltzmann Transport(LBT) model that incorporates both elastic and inelastic scatterings between jet partons and the thermal medium.Three different estimations of the jet formation time were implemented and compared,including instantaneous formation,formation from single splitting,and formation from sequential splittings,before which no jet-medium interaction was assumed.We found that deferring the jet-medium interaction with a longer formation time not only affects the overall magnitude of the nuclear modification factor of jets but also its dependence on the jet transverse momentum.

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

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：李树清邢文静刘峰磊曹杉杉秦广友 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 collisions.We 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 LHC.Our 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 momentum.We 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

Effects of centrality fluctuation and deuteron formation on the proton number cumulant in Au+Au collisions at√SNN=3 GeV from the JAM model

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Chinese Physics C 2021年第6期45卷 128-137页

作者： Arghya Chatterjee 张宇刘慧王瑞琴何澍罗晓峰 Key Laboratory of quark&Lepton Physics(MOE)and Institute of Particle Physics Central China Normal UniversityWuhan 430079China

We studied the effects of centrality fluctuation and deuteron formation on the cumulant(C_(n))and correlation functions(K_(n))of protons up to the sixth order in the most central(b<3 fm)Au+Au collisions at√SNN=3 GeV in a microscopic transport model(JAM).The results are presented as a function of rapidity acceptance within the transverse momentum 0.4

关键词： QCD critical point heavy-ion collisions quark-gluon plasma

Radial profile of bottom quarks in jets in high-energy nuclear collisions

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Chinese Physics C 2021年第6期45卷 167-175页

作者：王洒代巍张本威王恩科 Key Laboratory of quark&Lepton Physics(MOE)and Institute of Particle Physics Central China Normal UniversityWuhan 430079China 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 School of Mathematics and Physics China University of GeosciencesWuhan 430074China

Angular correlations between a heavy quark(HQ)and its tagged jet are potentially new tools to gain insight into the in-medium partonic interactions in relativistic heavy-ion collisions.In this work,we present the first theoretical study on the radial profiles of B mesons in jets in Pb+Pb collisions at the Large Hadron Collider(LHC).The initial production of a bottom quark tagged jet in p+p is computed by SHERPA,which matches the next-to-leading order matrix elements with contributions of parton showers,whereas the massive quark traversing the quark-gluon plasma is described by a Monte Carlo model,SHELL,which can simultaneously simulate light and heavy flavor in-medium energy loss within the framework of Langevin evolution.In p+p collisions,we find that at lower PQ/T the radial profiles of heavy flavors in jets are sensitive to the heavy quark mass.In 0-10%Pb+Pb collisions at√SNN=5.02 TeV,we observe an inverse modification pattern of the B meson radial profiles in jets at4PQ/T20 GeV region naturally has a narrower initial distribution and consequently leads to a narrower modification pattern of the radial profile;however the diffusion nature of the heavy flavor in-medium interactions will give rise to a broader modification pattern of the radial profile.These two effects consequently compete and offset with each other,and the b quarks in jets benefit more from the former and suffer less diffusion effect compared to that of c quarks in jets.These findings can be tested in the future experimental measurements at the LHC to gain better understanding of the mass effect of jet quenching.

关键词： jet quenching quark-gluon plasma heavy flavor jet radial profile mass effect

Efficiency corrections for mutually inclusive variables and particle identification effect for mixed-cumulants in heavy-ion collisions

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Chinese Physics C 2021年第10期45卷 58-68页

作者： Arghya Chatterjee Toshihiro Nonaka ShinIchi Esumi 罗晓峰 Key Laboratory of quark&Lepton Physics(MOE)and Institute of Particle Physics Central China Normal UniversityWuhan 430079China Tomonaga Center for the History of the Universe University of TsukubaIbaraki 305Japan

Mix-cumulants of conserved charge distributions are sensitive observables for probing properties of the QCD medium and phase transition in heavy-ion collisions.To perform precise measurements,efficiency correction is one of the most important step.In this study,using the binomial efficiency model,we derive efficiency correction formulas for mutually exclusive and inclusive variables.The UrQMD model is applied to verify the validity of these formulas for different types of correlations.Furthermore,we investigate the effect of the multiplicity loss and contamination emerging from the particle identifications.This study provides important steps toward future measurements of mixed-cumulants in relativistic heavy-ion collisions.

关键词： QCD critical point heavy-ion collisions quark-gluon plasma fluctuations and correlations

Photon production in relativistic heavy ion collisions with equilibrium and non-equilibrium QGP

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Chinese Physics C 2010年第2期34卷 186-191页

作者：傅永平李云德 Department of Physics Yunnan University

We consider the production sources of prompt and thermal photons which include the contribution of gluons in relativistic heavy ion collisions. Considering in our calculation the shadowing and iso-spin effects of the nucleus we can properly estimate the prompt photon production. We develop a new thermal jet-photon conversion mechanism which plays a vital role in the low transverse momentum region. The effect of the non-equilibrium quark-gluon plasma enhances the contribution of thermal photons.

关键词： relativistic heavy ion collisions quark-gluon plasma photons production