2025/09/16 by PHENIX Collaboration, Abdulameer, N. J., U. Acharya +454
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High-Energy Particle Collisions Research #Nuclear Experiment (nucl-ex) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.2509.13497
openalex publication_date 2025/09/16 · openalex created_date 2025/09/27 · openalex updated_date 2026/08/01
Utilizing the 2012 transversely polarized proton data from the Relativistic Heavy Ion Collider at Brookhaven National Laboratory, the forward η-meson transverse single-spin asymmetry (AN) was measured for p\uparrow+p collisions at √(s)=200 GeV as a function of Feynman-x (xF) for 0.2<|xF|<0.8 and transverse momentum (pT) for 1.0=0.086 ± 0.019), agreeing well with previous measurements of π0 and η AN, but with reach to higher xF and pT. The contribution of initial-state spin-momentum correlations to the asymmetry, as calculated in the collinear twist-3 framework, appears insufficient to describe the data and suggests a significant impact on the asymmetry from fragmentation.