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The PHENIX collaboration has measured high-$p_T$ dihadron correlations in$p$$+$$p$, $p$$+$Al, and $p$$+$Au collisions at $\sqrt{s_{_{NN}}}=200$ GeV. Thecorrelations arise from inter- and intra-jet correlations and thus havesensitivity to nonperturbative effects in both the initial and final states.The distributions of $p_{\rm out}$, the transverse momentum component of theassociated hadron perpendicular to the trigger hadron, are sensitive to initialand final state transverse momenta. These distributions are measuredmulti-differentially as a function of $x_E$, the longitudinal momentum fractionof the associated hadron with respect to the trigger hadron. The near-side$p_{\rm out}$ widths, sensitive to fragmentation transverse momentum, show nosignificant broadening between $p$$+$Au, $p$$+$Al, and $p$$+$$p$. The away-sidenonperturbative $p_{\rm out}$ widths are found to be broadened in $p$$+$Au whencompared to $p$$+$$p$; however, there is no significant broadening in $p$$+$Alcompared to $p$$+$$p$ collisions. The data also suggest that the away-side$p_{\rm out}$ broadening is a function of $N_{\rm coll}$, the number of binarynucleon-nucleon collisions, in the interaction. The potential implications ofthese results with regard to initial and final state transverse momentumbroadening and energy loss of partons in a nucleus, among other nucleareffects, are discussed.

Nonperturbative transverse momentum broadening in dihadron angular correlations in $\sqrt{s_{NN}}=200$ GeV proton-nucleus collisions