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\author{Derek Anderson}
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  \textbf{Measurement of medium-induced modification of jet yield and acoplanarity using semi-inclusive $\gamma_{\text{dir}}$+jet and $\pi^{0}$+jet distributions in $p$+$p$ and central Au+Au collisions at $\sqrt{s_{NN}} = 200$ GeV by STAR} \\
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  Derek Anderson, for the STAR Collaboration \\
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We report high-statistics measurements of semi-inclusive distributions of charged jets recoiling from high-$E_{\text{T}}$ direct photon ($\gamma_{\text{dir}}$) and $\pi^{0}$ triggers in $p$+$p$ and central Au+Au collisions at $\sqrt{s_{NN}} = 200$ GeV.  In a semi-inclusive approach, event bias is induced solely by the choice of trigger; separately utilizing $\gamma_{\text{dir}}$ and $\pi^{0}$ triggers in this analysis therefore provides direct comparison of jet quenching effects for jet populations with different q/g fractions and different in-medium path length distributions.  Jets are reconstructed from charged particles using the anti-$\text{k}_{\text{T}}$ algorithm with jet resolution parameters $R_{\text{jet}} = 0.2$ and 0.5.  The large uncorrelated background in central Au+Au collisions is corrected using a mixed event technique.  This enables a jet measurement extending to low $p_{\text{T}}$ and large $R_{\text{jet}}$ with well-controlled systematic uncertainties, which are of particular importance in searching for jet scattering effects.  We report recoil jet yield and trigger-jet acoplanarity distributions for jets with $p_{\text{T}} > 5$ GeV/$c$.  The comparison of recoil yields in Au+Au and $p$+$p$ collisions at fixed $R_{\text{jet}}$ probes energy loss in heavy-ion collisions.  Moreover, the comparison of recoil yields for different $R_{\text{jet}}$ in Au+Au and $p$+$p$ collisions probes intra-jet broadening.  The modification of trigger-jet acoplanarity distributions in central Au+Au collisions relative to $p$+$p$ collisions highlights the sensitivity of such a measurement to QGP transport parameters.  We also search for evidence of large-angle scattering of jets off of quasi-particles in the QGP.  The measured recoil yields and acoplanarity distributions are compared to theoretical calculations.

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