Polarized twist-three distributions $g_T$ and $h_L$ and the role of intrinsic transverse momentum

R. D. Tangerman; P. J. Mulders

Paper

Polarized twist-three distributions $g_T$ and $h_L$ and the role of intrinsic transverse momentum

Abstract

In a nonstandard way we split up the polarized quark distributions

and

into their twist-two, quark-mass, and interaction-dependent parts, emphasizing the sensitivity to quark intrinsic transverse momentum. We show how to derive the Burkhardt-Cottingham sum rule in this approach and derive a similar sum rule for the chiral-odd distribution

. The effect of intrinsic transverse momentum in experimental observables is illustrated in the calculation of the

double-spin asymmetry

in Drell-Yan scattering.