Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-03-12
Physics
High Energy Physics
High Energy Physics - Phenomenology
REVTEX, 7 pages, no figures
Scientific paper
We study a possible origin of single spin asymmetries in the large $p_T$ inclusive production of hadrons in the scattering of unpolarized protons or leptons on transversely polarized nucleons. Such asymmetry is related to the single-spin asymmetry for the process $\p^\uparrow \to q+X$ or, equivalently, to the off-diagonal matrix element of the quark density operator $\bar \psi \gamma^+ \psi$; this quantity need not be zero if transverse momentum and spin-isospin interactions are taken into account. The different signs for the large single spin asymmetries observed in $\p^\uparrow p \to \pi^+ X$ and $\p^\uparrow p \to \pi^- X$ can be explained as a consequence of chiral symmetry. Crucial tests of the model are suggested.
Anselmino Mauro
Drago Alessandro
Murgia Francesco
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