Mesons in (2+1) Dimensional Light Front QCD. II. Similarity Renormalization Approach

Details Mesons in (2+1) Dimensional Light Front QCD. II. Similarity Renormalization Approach Mesons in (2+1) Dimensional Light Front QCD. II. Similarity Renormalization Approach

2001-10-17

arxiv.org/abs/hep-th/0110156v1

Phys.Rev. D65 (2002) 045001

Physics

High Energy Physics

High Energy Physics - Theory

31 pages, 4 figures, to be published in Physical Review D

Scientific paper

10.1103/PhysRevD.65.045001

Recently we have studied the Bloch effective Hamiltonian approach to bound states in 2+1 dimensional gauge theories. Numerical calculations were carried out to investigate the vanishing energy denominator problem. In this work we study similarity renormalization approach to the same problem. By performing analytical calculations with a step function form for the similarity factor, we show that in addition to curing the vanishing energy denominator problem, similarity approach generates linear confining interaction for large transverse separations. However, for large longitudinal separations, the generated interaction grows only as the square root of the longitudinal separation and hence produces violations of rotational symmetry in the spectrum. We carry out numerical studies in the G{\l}azek-Wilson and Wegner formalisms and present low lying eigenvalues and wavefunctions. We investigate the sensitivity of the spectra to various parameterizations of the similarity factor and other parameters of the effective Hamiltonian, especially the scale $\sigma$. Our results illustrate the need for higher order calculations of the effective Hamiltonian in the similarity renormalization scheme.

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