Single Transverse-Spin Asymmetries at Large-x

Abstract

The large-$x$ behavior of the transverse-momentum dependent quark distributions is analyzed in the factorization-inspired perturbative QCD framework, particularly for the naive time-reversal-odd quark Sivers function which is responsible for the single transverse-spin asymmetries in various semi-inclusive hard processes. By examining the dominant hard gluon exchange Feynman diagrams, and using the resulting power counting rule, we find that the Sivers function has power behavior $(1-x{)}^4$ at $x\to 1$, which is one power of $(1-x)$ suppressed relative to the unpolarized quark distribution. These power-counting results provide important guidelines for the parameterization of quark distributions and quark-gluon correlations.

20 pages, 4 figures

Cited by in corpus (8)

• Relations between generalized and transverse momentum dependent parton distributions
• Transverse-momentum distributions in a diquark spectator model
• Azimuthal spin asymmetries in light-cone constituent quark models
• Transverse momentum dependent distribution functions in a covariant parton model approach with quark orbital motion
• Effect of Orbital Angular Momentum on Valence-Quark Helicity Distributions
• Are there approximate relations among transverse momentum dependent distribution functions?
• Extracting Boer-Mulders functions from $p+D$ Drell-Yan processes
• Recent developments in nucleon spin structure with focus on h_{1L}^{\perp} and pretzelosity h_{1T}^\perp