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Diffusion wake is an unambiguous part of the jet-induced medium response inhigh-energy heavy-ion collisions that leads to a depletion of soft hadrons inthe opposite direction of the jet propagation. New experimental data on$Z$-hadron correlation in Pb+Pb collisions at the Large Hadron Collider show,however, an enhancement of soft hadrons in the direction of both the $Z$ andthe jet. Using a coupled linear Boltzmann transport and hydro model, wedemonstrate that medium modification of partons from the initial multipleparton interaction (MPI) gives rise to a soft hadron enhancement that isuniform in azimuthal angle while jet-induced medium response and soft gluonradiation dominate the enhancement in the jet direction. After subtraction ofthe contributions from MPI with a mixed-event procedure, the diffusion wakebecomes visible in the near-side $Z$-hadron correlation. We further employ thelongitudinal and transverse gradient jet tomography for the first time tolocalize the initial jet production positions in $Z/\gamma$-jet events in whichthe effect of the diffusion wake is apparent in $Z/\gamma$-hadron correlationeven without the subtraction of MPI.

Search for the elusive jet-induced diffusion wake in $Z/\gamma$-jets with 2D jet tomography in high-energy heavy-ion collisions