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Area of Science:

  • Particle Physics
  • Quantum Chromodynamics
  • Hadron Phenomenology

Background:

  • Semi-inclusive deep-inelastic lepton-nucleon scattering (SIDIS) probes the proton's spin structure.
  • Understanding quark flavor decomposition is crucial for nuclear physics.

Purpose of the Study:

  • To provide next-to-next-to-leading order QCD corrections for polarized SIDIS.
  • To enhance precision in analyzing the proton's spin structure.

Main Methods:

  • Analytical calculation of QCD coefficient functions.
  • Comparison of theoretical predictions with experimental SIDIS data.

Main Results:

  • Full next-to-next-to-leading order QCD corrections derived in analytical form.
  • Demonstrated numerical impact of corrections using HERMES and COMPASS data.

Conclusions:

  • The derived corrections are essential for precision studies of proton spin structure.
  • Improved theoretical framework for interpreting SIDIS experiments.