Single Spin Asymmetries in Inclusive Hadron Production

Abstract

We consider a general formalism, previously developed to describe single spin asymmetries (SSA) in inclusive particle production at moderately large $p_T$ in hadron-hadron high-energy processes. In this approach SSA can originate from non perturbative, universal, quark distribution analyzing powers, provided the quark intrinsic motion is taken into account. A fit of the available data on $p^{\uparrow }p\to \ddot{I}€X$ fixes simplified phenomenological expressions of these quark analyzing powers for the dominant (at large $x_F$) $u$ and $d$ quark contributions. We use the results of the fit as input to provide a possible scenario for SSA in a number of interesting processes (e.g. $pp\to {\hat{I}}^{3}X$, $pp\to KX$) for which experimental results are or will soon be available.

3 pages, LaTeX, 2 ps figures, uses macros epsfig.sty, wrapfig.sty. Talk delivered by F. Murgia at the XII International Symposium on High Energy Spin Physics, Amsterdam, Sept. 10-14, 1996. To be published in the proceeedings