Search for jet-induced diffusion wake in heavy-ion collisions using photon-jet events with the ATLAS Detector

A search for the quark-gluon plasma medium response to jet energy loss, via modifications of hadron distributions opposite to jets in photon-jet events measured with the ATLAS detector in Pb+Pb collisions, is presented. Photon-jet events provide a particularly clean probe of the quark-gluon plasma medium response, since the photon does not interact with the quark-gluon plasma and therefore defines the initial parton kinematics. Results are shown differentially in the momentum balance variable, xJγ = pTJet/pTγ, and compared to theoretical expectations from the CoLBT model.