Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apri10005a&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
Single-spin asymmetries (SSA) in azimuthal distributions of final state particles in deep inelastic scattering (DIS) play a crucial role in the study of the spin structure of hadrons in terms of their elementary constituents. They give access to subtle distribution and fragmentation functions, which cannot easily be accessed in other ways. The higher-twist distributions while being important for understanding the long-range quark-gluon dynamics, contribute at leading order to certain asymmetries and will be very important at low beam energies (CEBAF,HERMES) because of the phenomenon of hadron-parton duality, or ``precocious scaling''. This contribution presents latest results from Jefferson Lab's CLAS detector on beam and target SSA in pion azimuthal distributions in one particle inclusive electroproduction in the DIS regime (Q^2>1GeV^2,W>2GeV) off an unpolarized hydrogen and polarized NH3 targets. Large single-beam and single-target spin asymmetries were observed at large z (fraction of the virtual photon momentum carried by the produced pion), a domain where semi-inclusive and exclusive processes overlap in hard scattering.
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