Di-jet Hadron Correlations in Central Au+Au Collisions at $\sqrt{s_{NN}}=200$ GeV at STAR

Jets and their modifications due to partonic energy loss provide a powerful tool to study the properties of the QGP created in ultrarelativistic heavy-ion collisions.\\ For jets reconstructed with the anti-$k_T$ algorithm with resolution parameter $R=0.4$, previous measurements of the di-jet asymmetry $A_J$ at STAR\cite{A} indicate that the observed imbalance of an initial ``hard-core" di-jet selection with $p_T^{\mathrm{const}}>2.0$ GeV/c, $p_T^{\mathrm{lead}}>20.0$ GeV/c and $p_T^{\mathrm{sub}}>10.0$ GeV/c is restored to the balance of the pp reference when soft constituents are included. The lost energy recovered with soft constituents suggests soft gluon radiation by high $p_{T}$ partons.\\ Jet-hadron correlations with respect to di-jets allow a differential assessment of the kinematic properties of the soft gluon radiation spectrum induced by partonic energy loss in the QGP. We present charged hadron correlations with respect to the di-jets found in the above $A_J$ analysis, and compare to similar measurements using a jet trigger at RHIC\cite{B}.\\ \\L. Adamczyk {\it et al.} (STAR), arXiv:1609.03878 [nucl-ex]. \bibitem{B} L. Adamczyk {\it et al.} (STAR), Phys.\ Rev.\ Lett.\ {\bf 112}, 122301 (2014).