B.L.G. Bakker

On the formulation of two- and three-body relativistic equations employing light-front dynamics

Abstract Using the light-front hamiltonian with two-body forces depending on internal variables only, we derive relativistic three-dimensional equations for the two- and three-body scattering operators.

eta(c)(3654) and hyperfine splitting in charmonium

The hyperfine splitting for the 2S charmonium state is calculated and the predicted number is Δ

Critique of the angular momentum sum rules and a new angular momentum sum rule

We present a study of the tensorial structure of the hadronic matrix elements of the angular momentum operators

Light-meson orbital excitations in the QCD string approach

\mathbit{J}

Light meson radial Regge trajectories

. Well known results in the literature are shown to be incorrect, and we have taken pains to derive the correct expressions in three different ways, two involving explicit physical wave packets and the third, totally independent, based upon the rotational properties of the state vectors. Surprisingly it turns out that the results are very sensitive to the type of relativistic spin state used to describe the motion of the particle, i.e., whether a canonical (i.e., boost) state or a helicity state is utilized. We present results for the matrix elements of the angular momentum operators, valid in an arbitrary Lorentz frame, for both helicity states and canonical states. These results are relevant for the construction of angular momentum sum rules, relating the angular momentum of a nucleon to the spin and orbital angular momentum of its constituents. It turns out that it is necessary to distinguish carefully whether the motion of the partons is characterized via canonical or helicity spin states. Fortunately, for the simple parton model interpretation, when the proton moves along

Regularizing the divergent structure of light-front currents

OZ

Decay constants of the heavy-light mesons from the field correlator method

, our results for the sum rule based upon the matrix elements of

Higher excitations of the D and D(s) mesons

{J}_{z}

Equivalence of light-front and covariant field theory

agree with the often used sum rule found in the literature. But for the components

Transition form factors between pseudoscalar and vector mesons in light-front dynamics

{J}_{x},{J}_{y}