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

### Submission summary

 As Contributors: Nicole Lewis Arxiv Link: https://arxiv.org/abs/2107.10079v1 (pdf) Date submitted: 2021-07-22 17:24 Submitted by: Lewis, Nicole Submitted to: SciPost Physics Proceedings Proceedings issue: DIS2021 Academic field: Physics Specialties: High-Energy Physics - Experiment Nuclear Physics - Experiment 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.

###### Current status:
Has been resubmitted

### Submission & Refereeing History

Resubmission 2107.10079v2 on 18 March 2022

Submission 2107.10079v1 on 22 July 2021

## Reports on this Submission

### Report

This paper reads smoothly and clearly. There are only 2 comments that should be considered before publishing.

First, x_F should be defined when it is used. Second, if possible, it would be good to move the inset plots in Figs. 1 and 2 to be stand-alone plots. If it is overly cumbersome to regenerate the figures, the paper can be published as is.

• validity: -
• significance: -
• originality: -
• clarity: -
• formatting: -
• grammar: -

### Author:  Nicole Lewis  on 2022-03-18  [id 2296]

(in reply to Report 1 on 2022-02-28)
Category:
remark
pointer to related literature

Apologies for the delay, I just resubmitted these proceedings and x_F is now defined. Unfortunately I am not able to regenerate Figs. 1 and 2 such that the inserts are stand alone plots. Their current format matches what is in the published paper: arXiv:2011.14170. Thank you.