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Dijet, dihadron, hadron-jet angular correlations have been reckoned asimportant probes of the transverse momentum broadening effects in relativisticnuclear collisions. When a pair of high-energy jets created in hard collisionstraverse the quark-gluon plasma produced in heavy-ion collisions, they becomede-correlated due to the vacuum soft gluon radiation associated with theSudakov logarithms and the medium-induced transverse momentum broadening. Forthe first time, we employ the systematical resummation formalism and establisha baseline calculation to describe the dihadron and hadron-jet angularcorrelation data in $pp$ and peripheral $AA$ collisions where the medium effectis negligible. We demonstrate that the medium-induced broadening $\langlep_\perp^2\rangle$ and the so-called jet quenching parameter $\hat q$ can beextracted from the angular de-correlations observed in $AA$ collisions. Aglobal $\chi^2$ analysis of dihadron and hadron-jet angular correlation datarenders the best fit $\langle p_\perp^2 \rangle \sim 13~\textrm{GeV}^2$ for aquark jet at RHIC top energy. Further experimental and theoretical effortsalong the direction of this work shall significantly advance the quantitativeunderstanding of transverse momentum broadening and help us acquireunprecedented knowledge of jet quenching parameter in relativistic heavy-ioncollisions.

Probing Transverse Momentum Broadening via Dihadron and Hadron-jet Angular Correlations in Relativistic Heavy-ion Collisions