Measurement of Direct-Photon Cross Section and Double-Helicity Asymmetry at $\sqrt{s}$ = 510 GeV in $\vec{p}+\vec{p}$ Collisions at PHENIX
Z. Ji* and
On behalf of the PHENIX collaboration*: corresponding author
Published on:
July 30, 2024
Abstract
Longitudinal polarized $\vec{p}+\vec{p}$ collisions provide a leading-order probe of the gluon spin contributions to the proton spin. The direct-photon production is named the "golden" channel due to its "cleanliness" and sensitivity to the sign of the gluon spin. The PHENIX measurement at the Relativistic Heavy-Ion Collider performed the first published direct-photon double-helicity asymmetry ($A_{LL}$) measurement. Our data indicate the gluon spin has a large probability of aligning with the proton spin. I will show the direct-photon cross sections and $A_{LL}$ measurements at PHENIX.
DOI: https://doi.org/10.22323/1.456.0192
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