Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Twist-3 T-odd fragmentation functions $G^\perp$ and $\tilde{G}^\perp$ in
  a spectator model   We present a calculation of the twist-3 T-odd chiral-even fragmentation
functions $G^{\perp}$ and $\tilde{G}^{\perp}$ using a spectator model. We
consider the effect gluon exchange to calculate all necessary one-loop diagrams
for the quark-quark and quark-gluon-quark correlation functions. We find that
the gluon loops corrections generate non-zero contribution to these two
fragmentation function. We numerically calculate their half-$k_T$ moments by
integrating over the transverse momentum and also verify the equation of motion
relation among $G^{\perp}$, $\tilde{G}^{\perp}$ and the Collins function.

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The categories of this paper are: mtrl-th
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The categories of this paper are: atom-ph
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The categories of this paper are: chem-ph
1
The categories of this paper are: cs
6
The categories of this paper are: astro-ph
24
The categories of this paper are: dg-ga
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The categories of this paper are: chao-dyn
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The categories of this paper are: stat
12
The categories of this paper are: nucl-th
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The categories of this paper are: q-fin
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The categories of this paper are: comp-gas
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The categories of this paper are: supr-con
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The categories of this paper are: q-alg
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The categories of this paper are: bayes-an
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The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci