Abstract
These proceedings present measurements of mid-rapidity semi-inclusive charged jet spectra and acoplanarity in relation to event activity (EA) at backward-rapidity (Au-going) in $\sqrt{s_\mathrm{NN}}=200\,\mathrm{GeV}$ $p$+Au collisions at STAR. Small system jet measurements have been motivated by apparent flow signals in these systems, suggestive of QGP formation. These specific small system jet measurements are particularly timely because they are the first semi-inclusive jet spectrum measurements in small systems at RHIC energy. As such, they complement results from PHENIX, ATLAS, and ALICE, which collectively are not yet well understood. The new STAR semi-inclusive jet spectra are dependent on EA; they are distinctly anti-correlated. Evidence is presented, using both the new measurements and simulation, that this anti-correlation results from constraints in the phase space of the initial collisions.
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