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

by Nicole Lewis

This Submission thread is now published as SciPost Phys. Proc. 8, 009 (2022)

Submission summary

As Contributors: Nicole Lewis
Arxiv Link: (pdf)
Date accepted: 2022-05-06
Date submitted: 2022-03-18 16:10
Submitted by: Lewis, Nicole
Submitted to: SciPost Physics Proceedings
Proceedings issue: DIS2021
Academic field: Physics
  • High-Energy Physics - Experiment
  • Nuclear Physics - Experiment
Approach: Experimental


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)

Submission & Refereeing History

Published as SciPost Phys. Proc. 8, 009 (2022)

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Resubmission 2107.10079v2 on 18 March 2022

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