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Ma G.-L.,CAS Shanghai Institute of Applied Physics
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2013

Within a multi-phase transport (AMPT) model with string melting scenario, the transverse momentum imbalance between prompt photon and jet is studied in Pb+Pb collisions at sNN=2.76TeV. Jet loses more energy in more central collisions due to strong partonic interactions between jet parton shower and partonic matter, which is more significant than due to hadronic interactions only. The hadronization and final-state hadronic interactions have little influences on the imbalance. The imbalance ratio xjγ is sensitive to both production position and passing direction of γ-jet, which provides an opportunity to do detail γ-jet tomography on the formed partonic matter by selecting different xjγ ranges. It is also proposed that γ-hadron azimuthal correlation associated with photon+jet is a probe to see the medium responses to different γ-jet production configurations. © 2013 Elsevier B.V. Source


Zhu Y.,CAS Shanghai Institute of Applied Physics
Nuclear Physics A | Year: 2013

We report preliminary results on HΛ3 production in Au + Au collisions at RHIC at √sNN=7.7, 11.5, 19.6, 27, 39, and 200 GeV. The beam energy dependence of strangeness population factor HΛ3/3HeΛ/p is shown and the result indicates that HΛ3/3HeΛ/p has an increasing trend with 1.7. σ significance. The hypertriton lifetime combining the above Au + Au collision data set is measured to be 123±2226(stat)±10(sys) ps. © 2013 Elsevier B.V. Source


Ma G.-L.,CAS Shanghai Institute of Applied Physics
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2014

Within a multi-phase transport (AMPT) model with the string melting mechanism and imported initial electric quadrupole moment, the difference between the elliptic flow of positive and negative pions is calculated. The slope parameter r of the linear dependence of δv2=v2(π-)-v2(π+) on A ch = (N + - N -)/(N + + N -) is yielded owing to the parton cascade, which converts the initial electric quadrupole distribution into the final charge-dependent elliptic flow. The slope parameter r is found to be increased by the hadronization given by the coalescence, and decreased by the resonance decays. The slope parameter r is very sensitive to both the initial electric quadrupole percentage and centrality bin and consequently a helpful constraint on the quadrupole moment of the chiral magnetic wave is obtained for Au + Au collisions at the top RHIC energy. © 2014 Elsevier B.V. Source


Ma G.-L.,CAS Shanghai Institute of Applied Physics | Bzdak A.,Brookhaven National Laboratory
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2014

We show that the incoherent elastic scattering of partons, as present in a multi-phase transport model (AMPT), with a modest parton-parton cross-section of σ. =. 1.5-3 mb, naturally explains the long-range two-particle azimuthal correlation as observed in proton-proton and proton-nucleus collisions at the Large Hadron Collider. © 2014 The Authors. Source


Ma G.-L.,CAS Shanghai Institute of Applied Physics
Physical Review C - Nuclear Physics | Year: 2013

Within a multiphase transport (AMPT) model, dijet asymmetry is studied in Pb+Pb collisions at √sNN=2.76 TeV. It is found that a large dijet asymmetry (AJ) is produced by strong interactions between jets and partonic matter. It is demonstrated that hadronization and final-state hadronic rescatterings have little effect on AJ. The final A J is found to be driven by both initial AJ and partonic jet energy loss, which is consistent with an increasing jet energy loss in a hot and strongly interacting partonic medium in more central Pb+Pb collisions. © 2013 American Physical Society. Source

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