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Dihadron azimuthal correlations in 200 GeV/c Au+Au have been simulated by amulti-phase transport (AMPT) model. Contribution from jet-medium interaction tocorrelation function is obtained by subtracting the combined harmonic flowbackground from the raw dihadron correlation function. Signals in centralitiesof 0-10%, 20-40% and 50-80% are compared in three associated transversemomentum ($p_{T}^{assoc}$) bins: 0.2-0.8 GeV/c, 0.8-1.4 GeV/c and 1.4-2.0GeV/c. An obvious medium modification impact can be seen from the signal shapechange and relative jet contribution in the above events, which shows differentbehaviors between central and peripheral events, and among different$p_{T}^{assoc}$ ranges in central events. More detailed $p_{T}^{assoc}$dependence of the derived nonflow contribution is studied in central 0-10%events, in which a strong $p_{T}^{assoc}$ dependence of RMS width is observed.We also calculated that relative jet contributions in peripheral and centralcollisions in the above mentioned cases.

Nonflow contribution to Dihadron Azimuthal Correlations in 200 GeV/c Au+Au Collisions