Light-Front QCD: A Constituent Picture of Hadrons

Details Light-Front QCD: A Constituent Picture of Hadrons Light-Front QCD: A Constituent Picture of Hadrons

1997-10-23

arxiv.org/abs/hep-th/9710175v1

Physics

High Energy Physics

High Energy Physics - Theory

44 pages, LATEX (including 4 ps-figures), uses epsfig.sty. Based on lectures given at the NATO Advanced Study Institute: Confi

Scientific paper

Light-front coordinates offer a scenario in which a constituent approximation of hadron structure can emerge from QCD. This requires cutoffs that violate Lorentz covariance and gauge invariance, and a new renormalization group formalism based on a similarity transformation is used with coupling coherence to fix counterterms that restore these symmetries. The counterterms contain functions of longitudinal momentum fractions which severely complicate renormalization, but they also offer possible resolutions of apparent contradictions between the constituent picture and QCD. The similarity transformation and coupling coherence are applied to QED; and it is shown that the resultant Hamiltonian leads to the correct bound state results. The same techniques are applied to QCD and it is shown that a simple confinement mechanism and a reasonable description of heavy quark bound states emerge naturally.

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