Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: QCD Sum Rule Calculation of Twist-4 Corrections to Bjorken and
  Ellis-Jaffe Sum Rules   We calculate the twist-4 corrections to the integral of $g_1(x,Q^2)$ in the
framework of QCD sum rules using an interpolating nucleon field which contains
explicitly a gluonic degree of freedom. This information can be used together
with previous calculations of the twist-3 contribution to the second moment of
$g_2(x)$ to estimate the higher-twist corrections to the Ellis-Jaffe and
Bjorken sum rules. We get $f^{(2)}(proton) = -0.037 \pm 0.006$ and
$f^{(2)}(neutron) = -0.013 \pm 0.006$. Numerically our results roughly agree
with those obtained by Balitsky, Braun and Kolesnichenko based on a sum rule
for a simpler current. Our calculations are far more stable as tested within
the sum rule approach but are more sensitive to less well known condensates.

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The categories of this paper are: hep-ex
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The categories of this paper are: solv-int
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The categories of this paper are: q-fin
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The categories of this paper are: chem-ph
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The categories of this paper are: cs
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The categories of this paper are: quant-ph
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The categories of this paper are: econ
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The categories of this paper are: q-alg
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The categories of this paper are: math-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: cond-mat
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The categories of this paper are: ao-sci
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The categories of this paper are: eess
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The categories of this paper are: astro-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: nlin