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Results are presented for the transverse single-spin asymmetries of directphotons, neutral pions, and eta mesons for $|\eta|<0.35$ from $p^\uparrow + p$collisions with $\sqrt{s} = 200$ GeV at PHENIX. As hadrons, $\pi^0$ and $\eta$mesons are sensitive to both initial- and final-state effects and atmidrapidity probe the dynamics of gluons along with a mix of quark flavors.Because direct photon production does not include hadronization, the directphoton TSSA is only sensitive to initial-state effects and at midrapidityprovides a clean probe of the gluon dynamics in transversely polarized protons.All three of these results will help constrain the collinear twist-3 trigluoncorrelation function as well as the gluon Sivers function, improving ourknowledge of spin-dependent gluon dynamics in QCD.

Transverse Single-Spin Asymmetries of Midrapidity Direct Photons and Neutral Mesons at PHENIX