Light-front QCD. II. Two-component theory

Wei Min Zhang, Avaroth Harindranath

Research output: Contribution to journalArticlepeer-review

97 Citations (Scopus)

Abstract

The light-front gauge Aa+=0 is known to be a convenient gauge in practical QCD calculations for short-distance behavior, but there are presistent concerns about its use because of its "singular" nature. The study of nonperturbative field theory quantizing on a light-front plane for hadronic bound states requires one to gain a priori systematic control of such gauge singularities. In the second paper of this series we study the two-component old-fashioned perturbation theory and various severe infrared divergences occurring in old-fashioned light-front Hamiltonian calculations for QCD. We also analyze the ultraviolet divergences associated with a large transverse momentum and examine three currently used regulators: an explicit transverse cutoff, transverse dimensional regularization, and a global cutoff. We discuss possible difficulties caused by the light-front gauge singularity in the applications of light-front QCD to both old-fashioned perturbative calculations for short-distance physics and upcoming nonperturbative investigations for hadronic bound states.

Original languageEnglish
Pages (from-to)4881-4902
Number of pages22
JournalPhysical Review D
Volume48
Issue number10
DOIs
Publication statusPublished - 1993

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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