Extracting jet transport parameter $\hat{q}$ from a multiphase transport model

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.