PoS - Proceedings of Science
Volume 352 - XXVII International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS2019) - Working Group 6: Spin and 3D Structure
Transverse Single-Spin Asymmetries of Midrapidity Eta Mesons at PHENIX
N. Lewis* and  On behalf of the PHENIX collaboration
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Pre-published on: June 27, 2019
Published on: October 04, 2019
Abstract
Transverse single-spin asymmetries (TSSAs) of proton-proton collisions have a long history of revealing the richness of QCD. Large TSSAs were originally discovered in fixed target experiments in the mid 1970s, but have been found to persist in collisions up to \( \sqrt{s} = 510 \) GeV and transverse momenta up to about 7 GeV/c. This is well into the perturbative regime of QCD and yet their origin remains poorly understood. The large TSSA measurements led to the development of both transverse momentum dependent descriptions and collinear twist-3 descriptions of nonperturbative spin-momentum correlations in the nucleon as well as in the process of hadronization. As hadrons, eta mesons are sensitive to both initial- and final-state nonperturbative effects for a mix of parton flavors. Their comparison to neutral pions may provide information on potential effects due to strangeness, isospin, or mass. The status of the TSSA of eta mesons at midrapidity for 200 GeV proton-proton collisions from the PHENIX 2015 data set will be shown.
DOI: https://doi.org/10.22323/1.352.0185
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