## Transport Model

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• ##### extracting jet Transport parameter hat q from a multiphase Transport Model
European Physical Journal A, 2020
Co-Authors: Fengchu Zhou, Y. G.
Abstract:

Within a multiphase Transport Model with a string-melting scenario, the jet Transport parameter $$\hat{q}$$ is extracted in Au+Au collisions at $$\sqrt{s_{NN} }$$= 200 GeV and Pb+Pb collisions at $$\sqrt{s_{NN} }$$= 2.76 TeV. The jet Transport parameter $$\hat{q}$$ is a key parameter in jet-quenching phenomena, which depends not only on the temperature of the QCD medium but also on jet energy. We observe that $$\hat{q}$$ increases with increasing of the jet energy for both the partonic phase and the hadronic phase. The energy and path length dependences of $$\hat{q}$$ in full heavy-ion evolution are consistent with the expectations of jet quenching. The correlation between jet Transport parameter $$\hat{q}$$ and dijet transverse momentum asymmetry $$A_J$$ is investigated. It is interesting to find that dijets with larger $$A_J$$ have larger length-averaged $$\hat{q}$$ values. Our study suggests that dijets with different $$A_J$$ values can provide versatile tools for studying jet quenching and extracting jet Transport parameters.

• ##### extracting jet Transport parameter hat q from a multiphase Transport Model
arXiv: High Energy Physics - Phenomenology, 2019
Co-Authors: Fengchu Zhou, Y. G.
Abstract:

Within a multi-phase Transport Model with string melting scenario, jet Transport parameter $\hat{q}$ is calculated in Au+Au collisions at $\sqrt{s_{NN} }$= 200 GeV and Pb+Pb collisions at $\sqrt{s_{NN} }$= 2.76 TeV. The $\hat{q}$ increases with the increasing of jet energy for both partonic phase and hadronic phase. The energy and path length dependences of $\hat{q}$ in full heavy-ion evolution are consistent with the expectations of jet quenching. The correlation between jet Transport parameter $\hat{q}$ and dijet transverse momentum asymmetry $A_{J}$ is mainly investigated, which discloses that a larger $\hat{q}$ corresponds to a larger $A_{J}$. It supports a consistent jet energy loss picture from the two viewpoints of single jet and dijet. It is proposed to measure dijet asymmetry distributions with different jet Transport parameter ranges as a new potential method to study jet quenching physics in high energy heavy-ion collisions.

• ##### Initial partonic eccentricity fluctuations in a multiphase Transport Model
Physical Review C, 2016
Co-Authors: Y. G.
Abstract:

Initial partonic eccentricities in Au+Au collisions at center-of-mass energy $\sqrt{s_{NN}}$ = 200 GeV are investigated using a multi-phase Transport Model with string melting scenario. The initial eccentricities in different order of harmonics are studied using participant and cumulant definitions. Eccentricity in terms of second-, fourth- and sixth order cumulants as a function of number of participant nucleons are compared systematically with the traditional participant definition. The ratio of the cumulant eccentricities $\varepsilon\left\{4\right\}/\varepsilon\left\{2\right\}$ and $\varepsilon\left\{6\right\}/\varepsilon\left\{4\right\}$ are studied in comparison with the ratio of the corresponding flow harmonics. The conversion coefficients ($v_n/\varepsilon_n$) are explored up to fourth order harmonic based on cumulant method. Furthermore, studies on transverse momentum ($p_T$) and pseudo-rapidity ($\eta$) dependencies of eccentricities and their fluctuations are presented. As in ideal hydrodynamics initial eccentricities are expected to be closely related to the final flow harmonics in relativistic heavy-ion collisions, studies of the fluctuating initial condition in the AMPT Model will shed light on the tomography properties of the initial source geometry.Comment: 13 pages, 8 figures; accepted by Phys. Rev.

• ##### initial partonic eccentricity fluctuations in a multiphase Transport Model
Physical Review C, 2016
Co-Authors: Y. G.
Abstract:

Initial partonic eccentricities in $\text{Au}+\text{Au}$ collisions at center-of-mass energy $\sqrt{{s}_{NN}}=200$ GeV are investigated by using a multiphase Transport Model with a string-melting scenario. The initial eccentricities in different order of harmonics are studied by using participant and cumulant definitions. Eccentricity in terms of second-, fourth- and sixth-order cumulants as a function of number of participant nucleons are compared systematically with the traditional participant definition. The ratio of the cumulant eccentricities $\ensuremath{\varepsilon}{4}/\ensuremath{\varepsilon}{2}$ and $\ensuremath{\varepsilon}{6}/\ensuremath{\varepsilon}{4}$ are studied in comparison with the ratio of the corresponding flow harmonics. The conversion coefficients (${v}_{n}/{\ensuremath{\varepsilon}}_{n}$) are explored up to fourth-order harmonics based on the cumulant method. Furthermore, studies on transverse momentum (${p}_{T}$) and pseudorapidity ($\ensuremath{\eta}$) dependencies of eccentricities and their fluctuations are presented. As in ideal hydrodynamics, initial eccentricities are expected to be closely related to the final flow harmonics in relativistic heavy-ion collisions, studies of the fluctuating initial condition in the AMPT Model will shed light on the tomography properties of the initial source geometry.

• ##### $\phi$-meson production at forward/backward rapidity in high-energy nuclear collisions from a multiphase Transport Model
Physical Review C, 2016
Co-Authors: J. H. Chen, Y. G., S. Q. Zhang, Chao Zhong
Abstract: