Einfallstor in die Sowjetunion: Die Besatzung Deutschlands und die Aussp?hung der UdSSR durch den britischen Nachrichtendienst?

Maddrell, John, 'Einfallstor in die Sowjetunion: Die Besatzung Deutschlands und die Aussp?hung der UdSSR durch den britischen Nachrichtendienst', Vierteljahrshefte f?r Zeitgeschichte (2003) 51(2) pp.183-227 RAE2008

Beam-target double-spin asymmetry A{LT} in charged pion production from deep inelastic scattering on a transversely polarized {3}He target at 1.4

We report the first measurement of the double-spin asymmetry A{LT} for charged pion electroproduction in semi-inclusive deep-inelastic electron scattering on a transversely polarized {3}He target. The kinematics focused on the valence quark region, 0.16ing neutron A{LT} asymmetries were extracted from the measured {3}He asymmetries and proton over {3}He cross section ratios using the effective polarization approximation. These new data probe the transverse momentum dependent parton distribution function g{1T}{q} and therefore provide access to quark spin-orbit correlations. Our results indicate a positive azimuthal asymmetry for π{-} production on {3}He and the neutron, while our π{+} asymmetries are consistent with zero.