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\title{Activity-dependent underlying event and jet measurements in $\sqrt{s_{{\rm NN}}}=\unit[200]{GeV}$
p+Au collisions at STAR}
\author{Isaac Mooney, David Stewart, and Veronica Verkest\\
for the STAR Collaboration}

\maketitle
Over the past decade, measurements of p+A c ollisions at the LHC and
RHIC have shown interesting correlations between mid-rapidity jet
yields and high-rapidity event activity (EA). In this poster, STAR
presents a number of measurements in p+Au collisions at $\sqrt{s_{{\rm NN}}}=\unit[200]{GeV}$
which help to address the cause of this behavior in small systems.
We show the underlying event (UE) at mid-rapidities and its dependence
on EA measured at backward (Au-going) rapidities and on jet kinematics,
after correcting for jet energy scale. We also show measurements of
jet production recoiling from high-energy triggers as a function of
EA, and determine via a Pythia8 model that the likely cause of the
observed EA-dependence is early-time phase space constraints between
the hard and soft processes. Lastly, we find, after fully correcting
inclusive jet substructure observables for detector effects with a
two-dimensional Bayesian unfolding, that jets are unmodified in high-EA
collisions. Collectively, these measurements favor a picture of early-time
modification due to cold nuclear matter effects or physical constraints
as opposed to jet quenching.
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