Gluonic contributions to semi-inclusive DIS in the target fragmentation region
arxiv(2024)
摘要
We study one-loop contributions to semi-inclusive deep inelastic scattering
in the target fragmentation region for a polarized lepton beam and nucleon
target. Complete one-loop results at leading twist are derived, with a
particular focus on the gluonic channel. It shows that four structure functions
are generated uniquely by the gluon fracture functions starting at one-loop.
Additionally, we obtain two structure functions associated with the
longitudinal polarization of the virtual photon, and they are contributed by
both gluon and quark channels. By combining existing twist-3 results, all
eighteen structure functions for the studied process are predicted in terms of
fracture functions convoluted with perturbative coefficient functions.
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