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\title{Measurements of jet and soft activity in $\sqrt{s_{{\rm NN}}}=\unit[200]{GeV}$
p+Au collisions at STAR}
\author{Tong Liu, Isaac Mooney, David Stewart, and Veronica Verkest\\
for the STAR Collaboration}

\maketitle
Proton-ion collisions at the LHC and RHIC have yielded unexpected
trends, notably in measurements of jet nuclear modification factors
at different collision centralities. Recent preliminary measurements
from STAR in p+Au collisions at $\sqrt{s_{{\rm NN}}}=\unit[200]{GeV}$
demonstrate inherent correlations between high-$Q^{2}$ parton scatterings
and event activity (EA), measured using either detectors at backward
(Au-going) rapidities or underlying event (UE) at mid-rapidity. The
measurements at STAR disfavor jet quenching as an explanation for
the suppression of jet yield observed in high-EA collisions. This
leads to an opportunity to probe the early stages of the collisions
and cold nuclear matter (CNM) effects. In this talk, we show correlations
of backward-rapidity EA with mid-rapidity UE, as well as measurements
of EA-dependent modifications to charged hadron spectra and jets.
In particular, we present measurements of the UE for various EA selections
and discuss its kinematic dependence on jet pseudorapidity and transverse
momentum, $p_{{\rm T}}$, as a means of examining the initial hard
scatterings. We also investigate the EA dependence of high-$p_{{\rm T}}$
hadron and jet properties -- including fully corrected ungroomed
and SoftDrop groomed jet substructure observables as a function of
EA -- to study the impact of initial and final state effects.
\end{document}