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As a new observable for heavy flavor correlations the momentum imbalance$A_D$ of D mesons is proposed. It is defined analogously to the jet momentumimbalance $A_J$ of fully reconstructed jets. However, since D mesons are flavortagged particles, no jet reconstruction is necessary. $A_D$ quantifies theinfluence of the medium created in heavy-ion collisions on correlated charmpairs. We present results with the partonic transport model Boltzmann Approachto MultiParton Scatterings (BAMPS), which describes well the nuclearmodification factor and elliptic flow of all heavy flavor particles at RHIC andLHC. The $A_D$ distribution in heavy-ion collisions at LHC is shifted to largervalues of $A_D$ compared to proton-proton collisions. We argue that this shiftis due to medium effects and can be explained partially by a path lengthimbalance of charm pairs and partially by momentum fluctuations in the initialcharm pair distribution.

Momentum imbalance of D mesons in ultra-relativistic heavy-ion collisions at LHC