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QCD factorization for semi-inclusive deep-inelastic scattering at low transverse momentum

Xiangdong Ji

Jian-Ping Ma

Feng Yuan

  • Department of Physics, University of Maryland, College Park, Maryland 20742, USA

  • Institute of Theoretical Physics, Academia Sinica, Beijing, 100080, P. R. China and Department of Physics, University of Maryland, College Park, Maryland 20742, USA

  • Department of Physics, University of Maryland, College Park, Maryland 20742, USA

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Phys. Rev. D 71, 034005 – Published 3 February, 2005

DOI: https://doi.org/10.1103/PhysRevD.71.034005

Abstract

We argue a factorization formula for semi-inclusive deep-inelastic scattering with hadrons in the current fragmentation region detected at low transverse momentum. To facilitate the factorization, we introduce the transverse-momentum dependent parton distributions and fragmentation functions with gauge links slightly off the light cone, and with soft-gluon radiations subtracted. We verify the factorization to one-loop order in perturbative quantum chromodynamics and argue that it is valid to all orders in perturbation theory.

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Phys. Rev. D 71, 034005– Published 3 February, 2005
  • Received 5 November 2004

© 2005 American Physical Society

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