D. Adams et al., SPIN ASYMMETRY IN MUON-PROTON DEEP-INELASTIC SCATTERING ON A TRANSVERSELY-POLARIZED TARGET, Physics letters. Section B, 336(1), 1994, pp. 125-130
We measured the spin asymmetry in the scattering of 100 GeV longitudin
ally-polarized muons on transversely polarized protons. The asymmetry
was found to be compatible with zero in the kinematic range 0.006 < x
< 0.6, 1 < Q(2) < 30 GeV2 From this result we derive the upper limits
for the virtual photon-proton asymmetry A(2), and for the spin structu
re function g(2) For x < 0.15, A(2) is significantly smaller than its
positivity limit root R.