Single-Spin Asymmetries in p^\uparrow p → πX and Chiral Symmetry

1997/03/12 by Mauro Anselmino, M. Anselmino, Alessandro Drago +6
Physics and Astronomy · #Black Holes and Theoretical Physics #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Noncommutative and Quantum Gravity Theories #Quantum Chromodynamics and Particle Interactions #hep-ph

paper · pdf · doi:10.48550/arxiv.hep-ph/9703303

REVTEX, 7 pages, no figures

arxiv created 1997/03/12 · openalex publication_date 1997/03/12 · arxiv updated 2009/11/30 · openalex created_date 2024/04/10 · openalex updated_date 2026/07/28

Abstract

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 → q+X or, equivalently, to the off-diagonal matrix element of the quark density operator ψγ⁺ ψ; 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 → π⁺ X and \p^\uparrow p → π^- X can be explained as a consequence of chiral symmetry. Crucial tests of the model are suggested.

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