Single spin asymmetry in forward pA collisions from the Pomeron-odderon interference

IF 5 2区物理与天体物理 Q1 Physics and Astronomy

Physical Review D Pub Date : 2025-05-16 DOI:10.1103/physrevd.111.094027

Sanjin Benić, Eric Andreas Vivoda

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引用次数: 0

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→hX polarized cross section also contains the transversity distribution for the polarized projectile as well as the real part of the twist-three fragmentation function. We numerically estimate the asymmetry AN and its nuclear dependence. Based on a model computation we find that AN can be a percent level in the forward and low-Ph⊥ region. For large nuclei we find significant suppression, with AN∝A−7/6 parametrically. As a notable feature we find a node of AN as a function of the Ph⊥ around the values of the initial saturation scale that could be used to test this mechanism experimentally.

Published by the American Physical Society

2025

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Pomeron-odderon干涉下正向pA碰撞中的单自旋不对称性

在高能pA碰撞的混合框架下，我们发现了横向单自旋不对称（SSA）的新贡献。稠密核靶中的波美龙-奥德龙干涉提供了SSA所需的相位。pA→hX极化截面的完整公式还包含了极化弹丸的横度分布以及扭转-三破片函数的实部。我们用数值方法估计了不对称AN及其对核的依赖。基于模型计算，我们发现AN可以是正向和低ph⊥区域的一个百分比水平。对于大的原子核，我们发现明显的抑制，AN∝A−7/6参数化。作为一个值得注意的特征，我们发现AN的节点是初始饱和尺度值周围的Ph⊥的函数，可以用来实验测试这种机制。2025年由美国物理学会出版

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来源期刊

Physical Review D 物理-天文与天体物理

CiteScore

9.20

自引率

36.00%

发文量

审稿时长

2 months

期刊介绍： Physical Review D (PRD) is a leading journal in elementary particle physics, field theory, gravitation, and cosmology and is one of the top-cited journals in high-energy physics. PRD covers experimental and theoretical results in all aspects of particle physics, field theory, gravitation and cosmology, including: Particle physics experiments, Electroweak interactions, Strong interactions, Lattice field theories, lattice QCD, Beyond the standard model physics, Phenomenological aspects of field theory, general methods, Gravity, cosmology, cosmic rays, Astrophysics and astroparticle physics, General relativity, Formal aspects of field theory, field theory in curved space, String theory, quantum gravity, gauge/gravity duality.