Search for the quark-gluon plasma diffusion wake via measurements of jet-hadron correlations in di-jet events in Pb+Pb collisions with the ATLAS detector

We present a measurement of jet-hadron correlations in di-jet events using Pb+Pb data taken at √s_NN = 5.02 TeV with the ATLAS detector. Jets passing through the Quark Gluon Plasma (QGP) are believed to produce a medium response in the form of a diffusion wake. Evidence of track depletion opposite quenched jets indicative of a diffusion wake is investigated. Angular correlations are measured as a function of the relative pseudorapidity difference |Δη_J-h| between jets and charged hadrons opposite in azimuthal angle φ. Correlations are reported for hadrons opposite leading and subleading jets in centrality ranges of 0-5\%, 5-10\%, and 10-20\% measured as a funciton of their relative transverse momentum x_J = p_T^j2 / p_T^j1, quantifying the jets' relative quenching. These correlations are predicted to be sensitive to a diffusion wake in the QGP. Study of the jet-wake can improve our understanding of the jet energy loss, as well as the hydrodynamic response of the QGP to the lost energy.