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QCD Sum Rule Calculation of Twist-3 Contributions to Polarized Nucleon Structure Functions
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QCD Sum Rule Calculation of Twist-3 Contributions to Polarized Nucleon Structure Functions
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Using the framework of QCD sum rules we predict the twist-3 contribution to the second moment of the polarized nucleon structure function $g_2(x)$. 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 analysis of a completely different correlation function, our estimates are consitent with those of Balitsky, Braun and Kolesnichenko who used a three-quark current.
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