53 citations · 106 across the 2 of their papers we have counts for
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Recent developments in nucleon spin structure with focus on h_{1L}^{\perp} and pretzelosity h_{1T}^\perp
H. Avakian, A. V. Efremov, P. Schweitzer +2
The leading twist transverse momentum dependent parton distribution functions h_{1L}^{\perp} and h_{1T}^\perp, which is sometimes called "pretzelosity," are studied. For h_{1L}^{\p…
Are there approximate relations among transverse momentum dependent distribution functions?
H. Avakian, A. V. Efremov, K. Goeke +3
Certain exact relations among transverse momentum dependent parton distribution functions due to QCD equations of motion turn into approximate ones upon the neglect of pure twist-3…
Light-cone divergence in twist-3 correlation functions
L. P. Gamberg, D. S. Hwang, A. Metz +1
It is argued that the definition of the twist-3 transverse momentum dependent correlation functions must be modified if they contain light-like Wilson lines. In the framework of a…
Sivers effect in semi-inclusive deeply inelastic scattering
J. C. Collins, A. V. Efremov, K. Goeke +3
The Sivers function is extracted from HERMES data on single spin asymmetries in semi-inclusive deeply inelastic scattering. Our analysis use a simple Gaussian model for the distrib…
Sivers effect in semi-inclusive DIS and in the Drell-Yan process
A. V. Efremov, K. Goeke, S. Menzel +2
The Sivers parton distribution has been predicted to obey a particular ``universality relation'', namely to have opposite sign in semi-inclusive deeply inelastic scattering (SIDIS)…
Lorentz invariance relations among parton distributions revisited
K. Goeke, A. Metz, P. V. Pobylitsa +1
We revisit the derivation of the so-called Lorentz invariance relations between parton distributions. In the most important cases these relations involve twist-3 and transverse mom…