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.

13 pages, 2 figures; Revised version, to appear in PRD

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Cited by in corpus (14)

• Quark Sivers Function at Small $x$: Spin-Dependent Odderon and the Sub-Eikonal Evolution
• Phenomenological constraints on $A_N$ in $p^{\uparrow }p\to \pi X$ from Lorentz invariance relations
• T-odd Leading-Twist Quark TMDs at Small $x$
• Exact Relations for Twist-3 Gluon Distribution and Fragmentation Functions from Operator Identities
• Single spin asymmetry in forward $pA$ collisions II: Fragmentation contribution
• Transverse spin observables in hard-scattering hadronic processes within collinear factorization
• Nuclear dependence of the transverse single-spin asymmetry in the production of charged hadrons at forward rapidity in polarized $p+p$, $p+$Al, and $p+$Au collisions at $\sqrt{s_{{}_{NN}}}=200$ GeV
• Lensing Mechanism Meets Small-$x$ Physics: Single Transverse Spin Asymmetry in $p^{\uparrow }+p$ and $p^{\uparrow }+A$ Collisions
• Single spin asymmetry in forward $pA$ collisions: Phenomenology at RHIC
• Single spin asymmetries in forward p-p/A collisions revisited: the role of color entanglement
• On the odderon mechanism for transverse single spin asymmetry in the Wandzura-Wilczek approximation
• Transverse single-spin asymmetry of charged hadrons at forward and backward rapidity in polarized $p$+$p$, $p$+Al, and $p$+Au collisions at $\sqrt{s_{NN}}=200$ GeV}
• Single spin asymmetry in forward $pA$ collisions from Pomeron-Odderon interference
• Single spin asymmetries in ultra-peripheral $p^{\uparrow }A$ collisions