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Jet-medium interactions are studied via a multi-hadron correlation technique(called "2+1"), where a pair of back-to-back hadron triggers with largetransverse momentum is used as a proxy for a di-jet. This work extends theprevious analysis for nearly-symmetric trigger pairs with the highest momentumthreshold of trigger hadron of 5 GeV/$c$ with the new calorimeter-basedtriggers with energy thresholds of up to 10 GeV and above. The distributions ofassociated hadrons are studied in terms of correlation shapes and per-triggeryields on each trigger side. In contrast with di-hadron correlation resultswith single triggers, the associated hadron distributions for back-to-backtriggers from central Au+Au data at $\sqrt{s_{NN}}$=200 GeV show no strongmodifications compared to d+Au data at the same energy. An imbalance in thetotal transverse momentum between hadrons attributed to the near-side andaway-side of jet-like peaks is observed. The relative imbalance in the Au+Aumeasurement with respect to d+Au reference is found to increase with theasymmetry of the trigger pair, consistent with expectation from medium-inducedenergy loss effects. In addition, this relative total transverse momentumimbalance is found to decrease for softer associated hadrons. Such evolutionindicates the energy missing at higher associated momenta is converted intosofter hadrons.

Studies of di-jets in Au+Au collisions using angular correlations with respect to back-to-back leading hadrons