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\title{Nuclear modification of charged hadrons and jets in isobar collisions
at $\sqrt{s_{\mathrm{NN}}}=\unit[200]{GeV}$ at STAR}
\author{Isaac Mooney for the STAR Collaboration}
\date{\today}
\maketitle
\begin{abstract}
\thispagestyle{empty}Partonic scatterings with high momentum transfer
occur before the formation of the quark-gluon plasma (QGP) in heavy-ion
(A+A) collisions and result in collimated collections of hadrons called
jets. The modification of the parton shower in the
QGP compared to that in proton-proton (p+p) collisions offers insight
into the nature of the medium's interaction with colored probes.
Typically, this is measured as a ratio of hadron or jet spectra
in A+A and p+p collisions called the $R_{\mathrm{AA}}$. The nominal RHIC A+A collision
species is gold (Au) with 197 nucleons, but the high-statistics
2018 STAR isobar data from Zr+Zr and Ru+Ru collisions, each with 96
nucleons, offer the opportunity to study the system size dependence
of nuclear modification of hard probes. \par
In this talk, we present a measurement of the inclusive charged
hadron $R_{\mathrm{AA}}$ differentially with average number of
participants ($\left\langle N_{\mathrm{part}}\right\rangle $) in
isobar collisions at STAR. The large available range of $\left\langle N_{\mathrm{part}}\right\rangle $
in these data allows for comparisons to small systems and Au+Au
results. We also present ongoing work to control the
path length of the partons through the medium via event shape engineering.
Events are categorized by their eccentricity, and within a given eccentricity
and centrality class, jets traveling in the event plane direction
are compared to those traveling perpendicular to it, in order to study
the dependence of jet energy loss on the collision geometry. 

\end{abstract}

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