作者机构：
[Qin, Guang-You; Wang, Xin-Nian; Zhang, Yuan-Yuan] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Hubei, Peoples R China.;[Qin, Guang-You; Wang, Xin-Nian; Zhang, Yuan-Yuan] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.;[Wang, Xin-Nian; Zhang, Yuan-Yuan] Lawrence Berkeley Natl Lab, Div Nucl Sci, Berkeley, CA 94720 USA.
通讯机构：
[Wang, Xin-Nian] C;[Wang, Xin-Nian] L;Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Hubei, Peoples R China.;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.;Lawrence Berkeley Natl Lab, Div Nucl Sci, Berkeley, CA 94720 USA.
摘要：
We revisit radiative parton energy loss in deeply inelastic scattering (DIS) off a large nucleus within the perturbative QCD approach. We calculate the gluon radiation spectra induced by double parton scattering in DIS without collinear expansion in the transverse momentum of initial gluons as in the original high-twist approach. The final radiative gluon spectrum can be expressed in terms of the convolution of hard partonic parts and unintegrated or transverse momentum dependent (TMD) quark-gluon correlations. The TMD quark-gluon correlation can be factorized approximately as a product of initial quark distribution and TMD gluon distribution which can be used to define the generalized or TMD jet transport coefficient. Under the static scattering center and soft radiative gluon approximation, we recover the result by Gylassy-Levai-Vitev in the first order of the opacity expansion. The difference as a result of the soft radiative gluon approximation is investigated numerically under the static scattering center approximation.
作者机构：
[Zhang, Ben-Wei; Zhang, Shan-Liang; Wang, Xin-Nian; Luo, Tan] Cent China Normal Univ, Key Lab Quark Lepton Phys MOE, Wuhan 430079, Hubei, Peoples R China.;[Zhang, Ben-Wei; Zhang, Shan-Liang; Wang, Xin-Nian; Luo, Tan] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.;[Wang, Xin-Nian] Lawrence Berkeley Natl Lab, Nucl Sci Div, Mailstop 70R0319, Berkeley, CA 94740 USA.
通讯机构：
[Zhang, Shan-Liang] C;Cent China Normal Univ, Key Lab Quark Lepton Phys MOE, Wuhan 430079, Hubei, Peoples R China.;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.
会议名称：
27th International Conference on Ultrarelativistic Nucleus-Nucleus Collisions (Quark Matter)
会议时间：
MAY 13-19, 2018
会议地点：
Venice, ITALY
会议主办单位：
[Zhang, Shan-Liang;Luo, Tan;Wang, Xin-Nian;Zhang, Ben-Wei] Cent China Normal Univ, Key Lab Quark Lepton Phys MOE, Wuhan 430079, Hubei, Peoples R China.^[Zhang, Shan-Liang;Luo, Tan;Wang, Xin-Nian;Zhang, Ben-Wei] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.^[Wang, Xin-Nian] Lawrence Berkeley Natl Lab, Nucl Sci Div, Mailstop 70R0319, Berkeley, CA 94740 USA.
关键词：
Jet quenching;Z tagged jet productions;QGP
摘要：
We report a systematic study of Z+jet correlation in Pb+Pb collisions at the LHC by combining the next-leading order matrix elements calculations with matched parton shower in Sherpa for the initial Z+jet production, and Linear Boltzmann transport Model for jet propagation in the expanding quark-gluon-plasma. Our numerical results can well explain CMS measurements on Z+jet correlation in Pb+Pb collisions: the shift of p(T) imbalance x(JZ) = p(T)(jet)/p(T)(Z) and their mean values, the suppression of the average number of jet partners per Z boson R-JZ, as well as the modification of azimuthal angle correlations Delta phi(JZ). We also demonstrate that high-order corrections play a significant role in the understanding of Z+jet correlations at high energies.
作者机构：
[Cao, Shanshan] Wayne State Univ, Dept Phys & Astron, Detroit, MI 48201 USA.;[Plumari, Salvatore; Das, Santosh Kumar; Greco, Vincenzo; Scardina, Francesco; Coci, Gabriele] Univ Catania, Dept Phys & Astron, Via Santa Sofia 64, I-95125 Catania, Italy.;[Greco, Vincenzo; Scardina, Francesco; Coci, Gabriele] Ist Nazl Fis Nucl, LNS, Lab Nazl Sud, Via Santa Sofia 62, I-95123 Catania, Italy.;[Das, Santosh Kumar] Indian Inst Technol Goa, Sch Phys Sci, Ponda, Goa, India.;[Xu, Yingru; Bass, Steffen; Ke, Weiyao] Duke Univ, Dept Phys, Durham, NC 27708 USA.
通讯机构：
[Wang, Xin-Nian] L;[Wang, Xin-Nian] C;Lawrence Berkeley Natl Lab, Nucl Sci Div, Berkeley, CA 94740 USA.;Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Hubei, Peoples R China.;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.
摘要：
Several transport models have been employed in recent years to analyze heavy-flavor meson spectra in high-energy heavy-ion collisions. Heavy-quark transport coefficients extracted from these models with their default parameters vary, however, by up to a factor of 5 at high momenta. To investigate the origin of this large theoretical uncertainty, a systematic comparison of heavy-quark transport coefficients is carried out between various transport models. Within a common scheme devised for the nuclear modification factor of charm quarks in a brick medium of a quark-gluon plasma, the systematic uncertainty of the extracted drag coefficient among these models is shown to be reduced to a factor of 2, which can be viewed as the smallest intrinsic systematical error band achievable at present time. This indicates the importance of a realistic hydrodynamic evolution constrained by bulk hadron spectra and of heavy-quark hadronization for understanding the final heavy-flavor hadron spectra and extracting heavy-quark drag coefficient. The transverse transport coefficient is less constrained due to the influence of the underlying mechanism for heavy-quark medium interaction. Additional constraints on transport models such as energy loss fluctuation and transverse-momentum broadening can further reduce theoretical uncertainties in the extracted transport coefficients.
作者机构：
[Gyulassy, M.; Wang, X. N.; Yuan, F.] Lawrence Berkeley Natl Lab, Nucl Sci Div, Berkeley, CA 94720 USA.;[Gyulassy, M.; Levai, P.] MTA Wigner Res Ctr Phys, H-1525 Budapest, Hungary.;[Gyulassy, M.] Columbia Univ, Dept Phys, Pupin Lab, MS-5202, New York, NY 10027 USA.;[Gyulassy, M.; Wang, X. N.; Liao, J.] Cent China Normal Univ, Inst Particle Phys, Wuhan, Hubei, Peoples R China.;[Shi, S.; Liao, J.] Indiana Univ, Phys Dept, 2401 N Milo B Sampson Lane, Bloomington, IN 47408 USA.
通讯机构：
[Gyulassy, M.] L;[Gyulassy, M.] M;[Gyulassy, M.] C;Lawrence Berkeley Natl Lab, Nucl Sci Div, Berkeley, CA 94720 USA.;MTA Wigner Res Ctr Phys, H-1525 Budapest, Hungary.
会议名称：
27th International Conference on Ultrarelativistic Nucleus-Nucleus Collisions (Quark Matter)
会议时间：
MAY 13-19, 2018
会议地点：
Venice, ITALY
会议主办单位：
[Gyulassy, M.;Yuan, F.;Wang, X. N.] Lawrence Berkeley Natl Lab, Nucl Sci Div, Berkeley, CA 94720 USA.^[Gyulassy, M.;Levai, P.] MTA Wigner Res Ctr Phys, H-1525 Budapest, Hungary.^[Gyulassy, M.] Columbia Univ, Dept Phys, Pupin Lab, MS-5202, New York, NY 10027 USA.^[Gyulassy, M.;Liao, J.;Wang, X. N.] Cent China Normal Univ, Inst Particle Phys, Wuhan, Hubei, Peoples R China.^[Liao, J.;Shi, S.] Indiana Univ, Phys Dept, 2401 N Milo B Sampson Lane, Bloomington, IN 47408 USA.^[Liao, J.;Shi, S.] Indiana Univ, Ctr Explorat Energy & Matter, 2401 N Milo B Sampson Lane, Bloomington, IN 47408 USA.
关键词：
Quark Gluon Plasmas sep Heavy Ion Collision;Jet Quenching;Dijet Acoplanarity
摘要：
Dijet acoplanarity is dominated by vacuum (Sudakov) pQCD radiation even in Pb+Pb collisions, but future higher precision measurements of the tails of the acoplanarity distributions can help to resolve separately the medium opacity, chi = L/lambda, and the color screening scale mu(2) from the path averaged BDMS saturation scale Q(s)(2)[ chi, mu]= integral dL (q) over cap (E,T(L)) proportional to mu L-2/lambda, that is already well constrained by nuclear modification factor data on R-AA(p(T)). We compare Gaussian (BDMS) and non-Gaussian (GLV) models of medium broadening of vacuum (Sudakov) induced acoplanarity distributions in A+A. With few percent accuracy on the ratio of A+A to p+p distributions, experiments can easily identify non-Gaussian Landau and Rutherford tails due to multiple collisions. However, we find that sub-percent precision will be required to constrain chi and mu separately from Q(s).
作者机构：
[Wang, Qun; Zhang, Jun-jie] Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Anhui, Peoples R China.;[Wang, Xin-Nian; Fang, Ren-hong] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Hubei, Peoples R China.;[Wang, Xin-Nian; Fang, Ren-hong] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.;[Wang, Xin-Nian] Lawrence Berkeley Natl Lab, Nucl Sci Div, MS 70R0319, Berkeley, CA 94720 USA.
通讯机构：
[Zhang, Jun-jie] U;Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Anhui, Peoples R China.
摘要：
We propose a microscopic description for the polarization from the first principle through the spin-orbit coupling in particle collisions. It is based on scatterings of particles as wave packets, an effective method to deal with particle scatterings at specified impact parameters. The polarization is then the consequence of particle collisions in a nonequilibrium state of spins. The spin-vorticity coupling naturally emerges from the spin orbit one encoded in polarized scattering amplitudes of collisional integrals when one assumes local equilibrium in momentum but not in spin.
摘要：
We revisit the calculation of multiple parton scattering of a heavy quark in nuclei within the framework of recently improved high-twist factorization formalism, in which gauge invariance is ensured by a delicate setup of the initial partons’ transverse momenta. We derive a new result for medium modified heavy quark fragmentation functions in deeply inelastic scattering. It is consistent with the previous calculation of light quark energy loss in the massless limit, but leads to a new correction term in the heavy quark case, which vanishes in the soft gluon radiation limit. We show numerically the significance of the new correction term in the calculation of heavy quark energy loss as compared to previous studies and with soft gluon radiation approximation.
作者机构：
[Wang, Xin-Nian; Pang, Long-Gang] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Hubei, Peoples R China.;[Wang, Xin-Nian; Pang, Long-Gang] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.;[Wang, Xin-Nian; Pang, Long-Gang] Univ Calif Berkeley, Phys Dept, Berkeley, CA 94720 USA.;[Wang, Xin-Nian; Pang, Long-Gang] Lawrence Berkeley Natl Lab, Nucl Sci Div, Berkeley, CA 94720 USA.;[Petersen, Hannah; Pang, Long-Gang] Frankfurt Inst Adv Studies, Ruth Moufang Str 1, D-60438 Frankfurt, Germany.
通讯机构：
[Pang, Long-Gang] C;[Pang, Long-Gang] U;Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Hubei, Peoples R China.;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.;Univ Calif Berkeley, Phys Dept, Berkeley, CA 94720 USA.
摘要：
Studies of fluctuations and correlations of soft hadrons and hard and electromagnetic probes of the dense and strongly interacting medium require event-by-event hydrodynamic simulations of high-energy heavy-ion collisions that are computing intensive. We develop a (3+1)-dimensional viscous hydrodynamic model—CLVisc that is parallelized on a graphics processing unit (GPU) by using the open computing language (OpenCL) with 60 times performance increase for spacetime evolution and more than 120 times for the Cooper–Frye particlization relative to that without GPU parallelization. The model is validated with comparisons with different analytic solutions, other existing numerical solutions of hydrodynamics, and experimental data on hadron spectra in high-energy heavy-ion collisions. The pseudorapidity dependence of anisotropic flow vn(η) are then computed in CLVisc with initial conditions given by the a multiphase transport (ampt) model, with energy density fluctuations both in the transverse plane and along the longitudinal direction. Although the magnitude of vn(η) and the ratios between v2(η) and v3(η) are sensitive to the effective shear viscosity over entropy density ratio ηv/s, the shape of the vn(η) distributions in η do not depend on the value of ηv/s. The decorrelation of vn along the pseudorapidity direction due to the twist and fluctuation of the event planes in the initial parton density distributions is also studied. The decorrelation observable rn(ηa,ηb) between vn{−ηa} and vn{ηa} with the auxiliary reference window ηb is found not to be sensitive to ηv/s when there is no initial fluid velocity. For small ηv/s, the initial fluid velocity from mini-jet partons introduces sizable splitting of rn(ηa,ηb) between the two reference rapidity windows ηb∈[3,4] and ηb∈[4.4,5.0], as has been observed in experiment. The implementation of CLVisc and guidelines on how to efficiently parallelize scientific programs on GPUs are also provided.
会议名称：
17th International Conference on Strangeness in Quark Matter (SQM)
会议时间：
JUL 10-15, 2017
会议地点：
Utrecht, NETHERLANDS
会议主办单位：
[Zhou, Kai;Pang, Long-gang;Su, Nan;Petersen, Hannah;Stoecker, Horst] Frankfurt Inst Adv Studies, D-60438 Frankfurt, Germany.^[Zhou, Kai;Petersen, Hannah;Stoecker, Horst] Goethe Univ, Inst Theoret Phys, D-60438 Frankfurt, Germany.^[Pang, Long-gang;Wang, Xin-Nian] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA.^[Pang, Long-gang;Wang, Xin-Nian] Lawrence Berkeley Natl Lab, Nucl Sci Div, Berkeley, CA 94720 USA.^[Petersen, Hannah;Stoecker, Horst] GSI Helmholtzzentrum Schwerionenforsch, D-64291 Darmstadt, Germany.^[Wang, Xin-Nian] Cent China Normal Univ, MOE, Key Lab Quark & Lepton Phys, Wuhan 430079, Hubei, Peoples R China.^[Wang, Xin-Nian] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.
会议论文集名称：
EPJ Web of Conferences
关键词：
conference;proceedings;physics;astronomy;The European Physical Journal;EPJ
摘要：
In this proceeding we review our recent work using supervised learning with a deep convolutional neural network (CNN) to identify the QCD equation of state (EoS) employed in hydrodynamic modeling of heavy-ion collisions given only final-state par-ticle spectra ρ(ρT , ℙ). We showed that there is a traceable encoder of the dynamical information from phase structure (EoS) that survives the evolution and exists in the final snapshot, which enables the trained CNN to act as an effective "EoS-meter" in detecting the nature of the QCD transition.
作者机构：
[Wang, Xin-Nian; Cao, Shanshan] Lawrence Berkeley Natl Lab, Nucl Sci Div, Berkeley, CA 94720 USA.;[Cao, Shanshan] Wayne State Univ, Dept Phys & Astron, 666 W Hancock St, Detroit, MI 48201 USA.;[Qin, Guang-You; Wang, Xin-Nian; Luo, Tan] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.;[Qin, Guang-You; Wang, Xin-Nian; Luo, Tan] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Hubei, Peoples R China.
通讯机构：
[Wang, Xin-Nian] L;[Wang, Xin-Nian] C;Lawrence Berkeley Natl Lab, Nucl Sci Div, Berkeley, CA 94720 USA.;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.;Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Hubei, Peoples R China.
摘要：
The Linear Boltzmann Transport (LBT) model coupled to hydrodynamical background is extended to include transport of both light partons and heavy quarks through the quark-gluon plasma (QGP) in high-energy heavy-ion collisions. The LBT model includes both elastic and inelastic medium-interaction of both primary jet shower partons and thermal recoil partons within perturbative QCD (pQCD). It is shown to simultaneously describe the experimental data on heavy and light flavor hadron suppression in high-energy heavy-ion collisions for different centralities at RHIC and LHC energies. More detailed investigations within the LBT model illustrate the importance of both initial parton spectra and the shapes of fragmentation functions on the difference between the nuclear modifications of light and heavy flavor hadrons. The dependence of the jet quenching parameter (q) over cap on medium temperature and jet flavor is quantitatively extracted. (c) 2017 The Authors. Published by Elsevier B.V.
期刊：
Proceedings of Science,2018年345 ISSN：1824-8039
通讯作者：
He, Y.
作者机构：
Key Laboratory of Quark and Lepton Physics (MOE), Institute of Particle Physics, Central China Normal University, Wuhan, 430079, China;Department of Physics and Astronomy, Wayne State University, Detroit, MI 48201, United States;Physics Department, University of California, Berkeley, CA 94720, United States;Nuclear Science Division Mailstop 70R0319, Lawrence Berkeley National Laboratory, Berkeley, CA 94740, United States
通讯机构：
Key Laboratory of Quark and Lepton Physics (MOE), Institute of Particle Physics, Central China Normal University, Wuhan, China
作者机构：
[Liu, S. Y. F.; Rapp, R.] Texas A&M Univ, Inst Cyclotron, College Stn, TX 77843 USA.;[Liu, S. Y. F.; Rapp, R.] Texas A&M Univ, Dept Phys & Astron, College Stn, TX USA.;[Nahrgang, M.; Gossiaux, P. B.] Univ Nantes, CNRS IN2P3, IMT Atlantique, SUBATECH, Nantes, France.;[Averbeck, R.; Andronic, A.; Bratkovskaya, E.; Masciocchi, S.; Inghirami, G.; Braun-Munzinger, P.] GSI Helmholtzzentrum Schwerionenforsch, Res Div, Darmstadt, Germany.;[Averbeck, R.; Andronic, A.; Bratkovskaya, E.; Masciocchi, S.; Inghirami, G.; Braun-Munzinger, P.] GSI Helmholtzzentrum Schwerionenforsch, EMMI, Darmstadt, Germany.
通讯机构：
[Gossiaux, P. B.] U;Univ Nantes, CNRS IN2P3, IMT Atlantique, SUBATECH, Nantes, France.
关键词：
Heavy flavor;Transport coefficient;Diffusion coefficient;High-energy heavy-ion collisions;Quark gluon plasma
摘要：
We report on broadly based systematic investigations of the modeling components for open heavy-flavor diffusion and energy loss in strongly interacting matter in their application to heavy-flavor observables in high-energy heavy-ion collisions, conducted within an EMMI Rapid Reaction Task Force framework. Initial spectra including cold-nuclear-matter effects, a wide variety of space-time evolution models, heavy-flavor transport coefficients, and hadronization mechanisms are scrutinized in an effort to quantify pertinent uncertainties in the calculations of nuclear modification factors and elliptic flow of open heavy-flavor particles in nuclear collisions. We develop procedures for error assessments and criteria for common model components to improve quantitative estimates for the (low-momentum) heavy-flavor diffusion coefficient as a long-wavelength characteristic of QCD matter as a function of temperature, and for energy loss coefficients of high-momentum heavy-flavor particles. (C) 2018 Elsevier B.V. All rights reserved.
作者机构：
[Gao, Jian-Hua] Shandong Univ, Inst Space Sci, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai 264209, Shandong, Peoples R China.;[Liang, Zuo-Tang] Shandong Univ, Sch Phys, Jinan 250100, Shandong, Peoples R China.;[Liang, Zuo-Tang] Shandong Univ, Key Lab Particle Phys & Particle Irradiat MOE, Jinan 250100, Shandong, Peoples R China.;[Wang, Qun] Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Anhui, Peoples R China.;[Wang, Xin-Nian] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Hubei, Peoples R China.
通讯机构：
[Gao, Jian-Hua] S;Shandong Univ, Inst Space Sci, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai 264209, Shandong, Peoples R China.
摘要：
We develop a general formalism for the quantum kinetics of chiral fermions in a background electromagnetic field based on a semiclassical expansion of covariant Wigner functions in the Planck constant ℏ. We demonstrate to any order of ℏ that only the time-component of the Wigner function is independent while other components are explicit derivative. We further demonstrate to any order of ℏ that a system of quantum kinetic equations for multiple-components of Wigner functions can be reduced to one chiral kinetic equation involving only the single-component distribution function. These are remarkable properties of the quantum kinetics of chiral fermions and will significantly simplify the description and simulation of chiral effects in heavy ion collisions and Dirac/Weyl semimetals. We present the unintegrated chiral kinetic equations in four-momenta up to O(ℏ2) and the integrated ones in three-momenta up to O(ℏ). We find that some singular terms emerge in the integration over the time component of the four-momentum, which result in a new source term contributing to the chiral anomaly, in contrast to the well-known scenario of the Berry phase term. Finally we rewrite our results in any Lorentz frame with a reference four-velocity and show how the non-trivial transformation of the distribution function in different frames emerges in a natural way.
作者机构：
[Wang, Xin-Nian; He, Yayun; Luo, Tan] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Hubei, Peoples R China.;[Wang, Xin-Nian; He, Yayun; Luo, Tan] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.;[Cao, Shanshan] Wayne State Univ, Dept Phys & Astron, Detroit, MI 48201 USA.;[Wang, Xin-Nian; He, Yayun] Lawrence Berkeley Natl Lab, Nucl Sci Div, Mailstop 70R0319, Berkeley, CA 94740 USA.
通讯机构：
[Wang, Xin-Nian] C;[Wang, Xin-Nian] L;Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Hubei, Peoples R China.;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.;Lawrence Berkeley Natl Lab, Nucl Sci Div, Mailstop 70R0319, Berkeley, CA 94740 USA.
摘要：
gamma-Jet production is considered one of the best probes of the hot quark-gluon plasma in high-energy heavy-ion collisions since the direct gamma can be used to gauge the initial energy and momentum of the associated jet. This is investigated within the Linear Boltzmann Transport (LBT) model for jet propagation and jet-induced medium excitation. With both parton energy loss and medium response from jet-medium interaction included, LBT can describe experimental data well on gamma-jet correlation in Pb+Pb collisions at the Large Hadron Collider. Multiple jets associated with direct gamma production are found to contribute significantly to gamma-jet correlation at small p(T)(jet) < p(T)(gamma) and large azimuthal angle relative to the opposite direction of gamma.Jet medium interaction not only suppresses the leading jet at large p(T)(jet) but also sub-leading jets at large azimuthal angle. This effectively leads to the narrowing of gamma-jet correlation in azimuthal angle instead of broadening due to jet-medium interaction. The gamma-jet profile on the other hand will be broadened due to jet-medium interaction and jet-induced medium response. Energy flow measurements relative to the direct photon is illustrated to reflect well the broadening and jet-induced medium response. (C) 2018 The Authors. Published by Elsevier B.V.
作者机构：
[Zhang, Ben-Wei; Zhang, Shan-Liang; Wang, Xin-Nian; Luo, Tan] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Hubei, Peoples R China.;[Zhang, Ben-Wei; Zhang, Shan-Liang; Wang, Xin-Nian; Luo, Tan] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.;[Wang, Xin-Nian] Lawrence Berkeley Natl Lab, Nucl Sci Div, Mailstop 70R0319, Berkeley, CA 94740 USA.
通讯机构：
[Zhang, Ben-Wei] C;Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Hubei, Peoples R China.;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.
摘要：
The impact of jet quenching on Z0-tagged jets in relativistic heavy-ion collisions at the CERN Large Hadron Collider is investigated. We employ the sherpa Monte Carlo program that combines next-to-leading-order matrix elements with matched resummation of parton shower to compute the initial Z0+jet production. The linear Boltzmann transport (LBT) model is then used to simulate the propagation, energy attenuation of, and medium response induced by jet partons in the quark-gluon plasma. With both higher-order corrections and matched soft and collinear radiation as well as a sophisticated treatment of parton energy loss and medium response in LBT, our numerical calculations can provide the best description so far of all available observables of Z0+jet simultaneously in both proton + proton and Pb+Pb collisions, in particular, the shift of the distribution in transverse momentum asymmetry xjZ=pTjet/pTZ, the modification of azimuthal angle correlation in ΔϕjZ=|ϕjet−ϕZ|, and the overall suppression of average number of Z0-tagged jets per boson RjZ at s=5.02 TeV as measured by the Compact Muon Solenoid experiment. We also show that higher-order corrections to Z0+jet production play an indispensable role in understanding Z0+jet azimuthal angle correlation at small and intermediate ΔϕjZ, and momentum imbalance at small xjZ. Jet quenching of the subleading jets is shown to lead to suppression of the Z0+jet correlation at small azimuthal angle difference ΔϕjZ and at small xjZ.
期刊：
Proceedings of Science,2018年345 ISSN：1824-8039
作者机构：
Institute for Physics, Eötvös Loránd University, 1/A Pázmány P. Sétány, Budapest, H-1117, Hungary;Wigner Research Centre for Physics of the Hungarian Academy of Sciences, 29-33 Konkoly-Thege Miklós Str, Budapest, H-1121, Hungary;Key Laboratory of Quark and Lepton Physics (MOE), Institute of Particle Physics, Central China Normal University, Wuhan, 430079, China;Nuclear Science Division, MS 70R0319, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States;Pupin Lab MS-5202, Department of Physics, Columbia University, New York, NY 10027, United States
期刊：
Proceedings of Science,2018年345 ISSN：1824-8039
作者机构：
Institute of Particle Physics and Key Laboratory of Quarks and Lepton Physics (MOE), Central China Normal University, Wuhan, 430079, China;Nuclear Science Division Mailstop 70R0319, Lawrence Berkeley National Laboratory, Berkeley, CA 94740, United States
作者机构：
[Wang, Qun; Yang, Yang-guang] Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Anhui, Peoples R China.;[Fang, Ren-hong; Wang, Xin-nian] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Hubei, Peoples R China.;[Fang, Ren-hong; Wang, Xin-nian] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.;[Wang, Xin-nian] Lawrence Berkeley Natl Lab, Nucl Sci Div, MS 70R0319, Berkeley, CA 94720 USA.
通讯机构：
[Yang, Yang-guang] U;Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Anhui, Peoples R China.
摘要：
A nonrelativistic quark coalescence model is formulated for polarized vector mesons and baryons of spin-1/2 octet and spin-3/2 decuplet. With the spin density matrix, one can compute in a uniform way the polarizations of vector mesons and baryons from those of quarks and antiquarks with explicit momentum dependence. The results are compared to those obtained from kinetic and statistical models for hadrons.
作者机构：
[Chen, Wei; Wang, Xin-Nian; Luo, Tan] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Hubei, Peoples R China.;[Chen, Wei; Wang, Xin-Nian; Luo, Tan] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.;[Wang, Xin-Nian; Pang, Long-Gang; Cao, Shanshan] Lawrence Berkeley Natl Lab, Nucl Sci Div MS 70R0319, Berkeley, CA 94720 USA.;[Cao, Shanshan] Wayne State Univ, Dept Phys & Astron, Detroit, MI 48201 USA.;[Wang, Xin-Nian; Pang, Long-Gang] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA.
通讯机构：
[Wang, Xin-Nian] C;[Wang, Xin-Nian] L;[Wang, Xin-Nian] U;Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Hubei, Peoples R China.;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.
摘要：
Coupled Linear Boltzmann Transport and hydrodynamics (CoLBT-hydro) is developed for co-current and event-by-event simulations of jet transport and jet-induced medium excitation (j.i.m.e.) in high-energy heavy-ion collisions. This is made possible by a GPU parallelized (3+1)D hydrodynamics that has a source term from the energy-momentum deposition by propagating jet shower partons and provides real time update of the bulk medium evolution for subsequent jet transport. Hadron spectra in gamma-jet events of A+A collisions at RHIC and LHC are calculated for the first time that include hadrons from both the modified jet and j.i.m.e. CoLBT-hydro describes well experimental data at RHIC on the suppression of leading hadrons due to parton energy loss. It also predicts the enhancement of soft hadrons from j.i.m.e. The onset of soft hadron enhancement occurs at a constant transverse momentum due to the thermal nature of soft hadrons from j.i.m.e. which also have a significantly broadened azimuthal distribution relative to the jet direction. Soft hadrons in the gamma direction are, on the other hand, depleted due to a diffusion wake behind the jet. (c) 2017 The Authors. Published by Elsevier B.V.
