Twist - 3 polarized structure functions

Twist - 3 polarized structure functions ∗

We review the nucleon’s twist-3 polarized structure functions from the viewpoint of gauge invariant, nonlocal light-cone operators in QCD. We discuss a systematic treatment of the polarized structure functions and the corresponding parton distribution functions. We emphasize unique features of higher twist distributions, and the role of the QCD equations of motion to derive their anomalous dime...

Integral Relations for Twist 2 and Twist 3 Contributions to Polarized Structure Functions

We discuss the relations between the twist 2 and twist 3 contributions to polarized deep-inelastic scattering structure functions both for neutral and charged current interactions which are predicted by the operator product expansion in lowest order in QCD. INTRODUCTION In the case of polarized deep inelastic scattering the cross sections depend on (up to) three unpolarized Fi(x,Q 2)3i=1 and fi...

Twist-3 Effects in Polarized Photon Structure *

In recent years there has been growing interest in the polarized photon structure functions. Especially the first moment of a photon structure function g 1 has attracted much attention in connection with the axial anomaly which is also relevant in the nucleon spin structure function g p(n) 1 . The polarized structure function g γ 1 could be experimentally studied in the polarized version of ep ...

QCD Sum Rule Calculation of Twist-3 Contributions to Polarized Nucleon Structure Functions

Using the framework of QCD sum rules we predict the twist-3 contribution to the second moment of the polarized nucleon structure function g2(x). As the relevant local operator depends explicitely on the gluon field, we employ a recently studied interpolating nucleon current which contains three quark field and one gluon field operator. Despite the fact that our calculation is based on the analy...

Interactions : Structure Functions , Higher Twist