  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. The
correlations arise from inter- and intra-jet correlations and thus have
sensitivity to nonperturbative effects in both the initial and final states.
The distributions of $p_{\rm out}$, the transverse momentum component of the
associated hadron perpendicular to the trigger hadron, are sensitive to initial
and final state transverse momenta. These distributions are measured
multi-differentially as a function of $x_E$, the longitudinal momentum fraction
of the associated hadron with respect to the trigger hadron. The near-side
$p_{\rm out}$ widths, sensitive to fragmentation transverse momentum, show no
significant broadening between $p$$+$Au, $p$$+$Al, and $p$$+$$p$. The away-side
nonperturbative $p_{\rm out}$ widths are found to be broadened in $p$$+$Au when
compared to $p$$+$$p$; however, there is no significant broadening in $p$$+$Al
compared 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 binary
nucleon-nucleon collisions, in the interaction. The potential implications of
these results with regard to initial and final state transverse momentum
broadening and energy loss of partons in a nucleus, among other nuclear
effects, are discussed.
