Single Spin Asymmetry in Forward $pA$ Collisions

Abstract

We compute the transverse single spin asymmetry in light hadron production $p^{\uparrow }p\to hX$ and $p^{\uparrow }A\to hX$ including the gluon saturation effect in the unpolarized nucleon/nucleus. In the forward (large-$x_F$) region, the dominant contribution comes from the so-called derivative term associated with the soft gluonic pole. This leads to the cancellation of nuclear effects in $A_N$ which can be tested at RHIC. We also show that the soft fermionic pole disappears in the saturation environment.

arXiv comment13 pages, 2 figures; Revised version, to appear in PRD

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• Phenomenological constraints on $A_N$ in $p^{\uparrow }p\to \pi X$ from Lorentz invariance relations
• T-odd Leading-Twist Quark TMDs at Small $x$
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• Transverse spin observables in hard-scattering hadronic processes within collinear factorization
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• Single spin asymmetry in forward $pA$ collisions: Phenomenology at RHIC
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• Single spin asymmetry in forward $pA$ collisions from Pomeron-Odderon interference
• Single spin asymmetries in ultra-peripheral $p^{\uparrow }A$ collisions