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Transverse Single-Spin Asymmetries of Midrapidity Direct Photons and Neutral Mesons at PHENIX
by Nicole Lewis
Submission summary
| Authors (as registered SciPost users): | Nicole Lewis |
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| Preprint Link: | https://arxiv.org/abs/2107.10079v2 (pdf) |
| Date accepted: | May 6, 2022 |
| Date submitted: | March 18, 2022, 4:10 p.m. |
| Submitted by: | Nicole Lewis |
| Submitted to: | SciPost Physics Proceedings |
| Proceedings issue: | 28th Annual Workshop on Deep-Inelastic Scattering (DIS) and Related Subjects (DIS2021) |
| Ontological classification | |
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| Academic field: | Physics |
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| Approach: | Experimental |
Abstract
Results are presented for the transverse single-spin asymmetries of direct photons, 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 at midrapidity probe the dynamics of gluons along with a mix of quark flavors. Because direct photon production does not include hadronization, the direct photon TSSA is only sensitive to initial-state effects and at midrapidity provides a clean probe of the gluon dynamics in transversely polarized protons. All three of these results will help constrain the collinear twist-3 trigluon correlation function as well as the gluon Sivers function, improving our knowledge of spin-dependent gluon dynamics in QCD.
Published as SciPost Phys. Proc. 8, 009 (2022)