Single Transverse-Spin Asymmetry in $pp^\uparrow \to πX$ and $ep^\uparrow \to πX$

Abstract

Cross section formulas for the single spin asymmetry in $p^\uparrow p\to π(\ell_T)X$ and $e p^\uparrow \to π(\ell_T)X$ are derived and its characteristic features are discussed.

Figures (4)

• Figure 1: $A_N^{pp}$ at $\sqrt{S}=20$ GeV and $\ell_T=1.5$ GeV.
• Figure 2: $A_N^{pp}$ at $\sqrt{S}=200$ GeV and $\ell_T=1.5$ GeV.
• Figure 3: $\ell_T$ dependence of $A_N^{pp}$ at $\sqrt{S}=200$ GeV and $x_F=0.6$.
• Figure 4: $A_N^{ep}$ at $\sqrt{S}=20$ GeV.