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Search Results: 1 - 10 of 96310 matches for " Xiao-Ming Xu "
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J/psi Production in an Equilibrating Partonic System
xu, Xiao-Ming
High Energy Physics - Phenomenology , 2007, DOI: 10.1016/S0375-9474(99)00350-4
Abstract: Any color singlet or octet ccbar pair is created at short distances and then expands to a full size of J/psi. Such a dynamical evolution process is included here in calculations for the J/psi number distribution as a function of transverse momentum and rapidity in central Au-Au collisions at both RHIC and LHC energies. The ccbar pairs are produced in the initial collision and in the partonic system during the prethermal and thermal stages through the partonic channels ab to ccbar [{2S+1}L_J] and ab to ccbar [{2S+1}L_J]x, and then they dissociate in the latter two stages. Dissociation of ccbar in the medium occurs via two reactions: (a) color singlet ccbar plus a gluon turns to color octet ccbar, (b) color octet ccbar plus a gluon persists as color octet. There are modest yields of ccbar in the prethermal stage at RHIC energy and through the reactions ab to ccbar [{2S+1}L_J] at LHC energy for partons with large average momentum in the prethermal stage at both collider energies and in the thermal stage at LHC energy. Production from the partonic system competes with the suppression of the initial yield in the deconfined medium. Consequently, a bulge within -1.5
Early thermalization of quark-gluon matter by elastic 3-to-3 scattering
Xu, Xiao-Ming
High Energy Physics - Phenomenology , 2013,
Abstract: The early thermalization is crucial to the quark-gluon plasma as a perfect liquid and results from many-body scattering. We calculate squared amplitudes for elastic parton-parton-parton scattering in perturbative QCD. Transport equations with the squared amplitudes are established and solved to obtain the thermalization time of initially produced quark-gluon matter and the initial temperature of quark-gluon plasma. We find that the thermalization times of quark matter and gluon matter are different.
Triple-Gluon and Triple-Quark Elastic Scatterings and Early Thermalization
Xiao-Ming Xu
Physics , 2005, DOI: 10.1140/epja/i2005-10295-7
Abstract: Three-gluon to three-gluon scatterings lead to rapid thermalization of gluon matter created in central Au-Au collisions at RHIC energies. Thermalization of quark matter is studied from three-quark to three-quark scatterings.
Thermalization of quark-gluon matter by 2-to-2 and 3-to-3 elastic scatterings
Xiao-Ming Xu
Physics , 2007, DOI: 10.1088/0954-3899/34/8/S113
Abstract: Thermalization of quark-gluon matter is studied with a transport equation that includes contributions of 2-to-2 and 3-to-3 elastic scatterings. Thermalization time is related to the squared amplitudes for the elastic scatterings that are calculated in perturbative QCD.
Recall a Prediction on J/psi Nuclear Modification Factor for STAR Measurements
Xiao-Ming Xu
Physics , 2008,
Abstract: STAR collaboration has offered eminent nuclear modification factor of J/psi at high p_T and midrapidity produced in Cu-Cu collisions at \sqrt {s_{NN}}= 200 GeV. Recalling a prediction we can understand that the feature of high-p_T nuclear modification factor is related to c\bar c produced by 2-to-1 and 2-to-2 partonic processes in deconfined matter particularly in the prethermal stage and to the recombination of c and \bar c. The nuclear modification factor at high p_T is sensitive to the earliest form of deconfined matter that does not have a temperature.
Origin of Temperature of Quark-Gluon Plasma in Heavy Ion Collisions
Xiao-Ming Xu
Physics , 2015, DOI: 10.1142/9789814689304_0031
Abstract: Initially produced quark-gluon matter at RHIC and LHC does not have a temperature. A quark-gluon plasma has a high temperature. From this quark-gluon matter to the quark-gluon plasma is the early thermalization or the rapid creation of temperature. Elastic three-parton scattering plays a key role in the process. The temperature originates from the two-parton scattering, the three-parton scattering, the four-parton scattering and so forth in quark-gluon matter.
Early Thermalization at RHIC
Xiao-Ming Xu
Physics , 2004,
Abstract: Triple-gluon elastic scatterings are briefly reviewed since the scatterings explain the early thermalization puzzle in Au-Au collisions at RHIC energies. A numerical solution of the transport equation with the triple-gluon elastic scatterings demonstrates gluon momentum isotropy achieved at a time of the order of 0.65 fm/c. Triple-gluon scatterings lead to a short thermalization time of gluon matter.
Early thermalization of quark-gluon matter initially created in high-energy nucleus-nucleus collisions
Xiao-Ming Xu
Physics , 2013, DOI: 10.1088/1742-6596/458/1/012021
Abstract: Elastic parton-parton-parton scattering is briefly reviewed and is included in transport equations of quark-gluon matter. We solve the transport equations and get thermal states from initially produced quark-gluon matter. Both gluon matter and quark matter take early thermalization, but gloun matter has a shorter thermalization time than quark matter.
Free Quarks and Antiquarks versus Hadronic Matter
Xu, Xiao-Ming;Peng, Ru
High Energy Physics - Phenomenology , 2007,
Abstract: Meson-meson reactions A(q_1 \bar{q}_1) + B(q_2 \bar{q}_2) to q_1 + \bar{q}_1 + q_2 + \bar{q}_2 in high-temperature hadronic matter are found to produce an appreciable amount of quarks and antiquarks freely moving in hadronic matter and to establish a new mechanism for deconfinement of quarks and antiquarks in hadronic matter.
Free Quarks and Antiquarks versus Hadronic Matter
Xiao-Ming Xu,Ru Peng
Physics , 2007, DOI: 10.1088/1674-1137/33/9/007
Abstract: Meson-meson reactions A(q_1 \bar{q}_1) + B(q_2 \bar{q}_2) to q_1 + \bar{q}_1 + q_2 + \bar{q}_2 in high-temperature hadronic matter are found to produce an appreciable amount of quarks and antiquarks freely moving in hadronic matter and to establish a new mechanism for deconfinement of quarks and antiquarks in hadronic matter.
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