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

by Nicole Lewis

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Authors (as registered SciPost users): Nicole Lewis
Submission information
Preprint Link:  (pdf)
Date submitted: 2021-07-22 17:24
Submitted by: Lewis, Nicole
Submitted to: SciPost Physics Proceedings
Proceedings issue: 28th Annual Workshop on Deep-Inelastic Scattering (DIS) and Related Subjects (DIS2021)
Ontological classification
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.

Current status:
Has been resubmitted

Submission & Refereeing History

Resubmission 2107.10079v2 on 18 March 2022

Reports on this Submission

Anonymous Report 1 on 2022-2-28 (Invited 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)
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.

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