Single spin asymmetry in forward pA collisions from Pomeron-Odderon interference

2025/01/22 by Sanjin Benić, Eric Andreas Vivoda, Benić, Sanjin +1
Physics and Astronomy · Mathematics · #High-Energy Particle Collisions Research #Random Matrices and Applications #Nuclear physics research studies

paper · pdf · doi:10.48550/arxiv.2501.12847

Abstract

Working in the hybrid framework of the high energy pA collisions we identify a new contribution to transverse single spin asymmetry (SSA). The phase necessary for the SSA is provided by the Pomeron-Odderon interference in the dense nuclear target. The complete formula for the pA → h X polarized cross section also contains the transversity distribution for the polarized projectile as well as the real part of the twist-3 fragmentation function. We numerically estimate the asymmetry A_N and its nuclear dependence. Based on a model computation we find that A_N can be a percent level in the forward and low-P_h⊥ region. For large nuclei we find significant suppression, with A_N ∝ A^-7/6 parametrically. As a notable feature we find a node of A_N as a function of the P_h⊥ around the values of the initial saturation scale that could be used to test this mechanism experimentally.

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