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

Dihadron azimuthal correlations in 200 GeV/c Au+Au have been simulated by a multi-phase transport (AMPT) model. Contribution from jet-medium interaction to correlation function is obtained by subtracting the combined harmonic flow background from the raw dihadron correlation function. Signals in centralities of 0-10%, 20-40% and 50-80% are compared in three associated transverse momentum ($p_{T}^{assoc}$) bins: 0.2-0.8 GeV/c, 0.8-1.4 GeV/c and 1.4-2.0 GeV/c. An obvious medium modification impact can be seen from the signal shape change and relative jet contribution in the above events, which shows different behaviors 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 central collisions in the above mentioned cases.