arXiv subjects

S. R. Cotanch

Publications and source records attributed to S. R. Cotanch.

5 recordsLinked to original sources

arXiv1998

Renormalized Effective QCD Hamiltonian: Gluonic Sector

Extending previous QCD Hamiltonian studies, we present a new renormalization procedure which generates an effective Hamiltonian for the gluon sector. The formulation is in the Coulomb gauge where the QCD Hamiltonian is renormalizable and the Gribov problem can be resolved. We utilize elements of the Glazek and Wilson regularization method but now introduce a continuous cut-off procedure which eliminates non-local counterterms. The effective Hamiltonian is then derived to second order in the strong coupling constant. The resulting renormalized Hamiltonian provides a realistic starting point for approximate many-body calculations of hadronic properties for systems with explicit gluon degrees of freedom.

hep-ph↗

arXiv1998

Renormalized Effective Hamiltonian Approach to QCD

Continuing our previous QCD Hamiltonian studies in the gluonic and quark sectors, we describe a new renormalization procedure which generates an effective Hamiltonian. The formulation, which is in the Coulomb gauge, provides an improved framework for investigating hadron structure.

hep-ph↗

arXiv1993

Light Quark Energy Distribution in Heavy Quark Symmetry

Using heavy quark symmetry we construct an energy sum rule relating the form factor of a heavy flavored meson $ξ(w)$ to the light quark energy distribution. We find that the current available data for $ξ(w)$ is consistent with a broad energy distribution rather than with that of a pure quark/anti-quark bound state, indicating a large nonvalence content.

hep-ph↗

arXiv1993

Covariant Variable Front Quark Model

We study the implications of Lorentz symmetry for hadronic structure by formulating a manifestly covariant constituent quark model and find full covariance for any Lorentz transformation requires utilizing a variable quantization surface. Even though time-reversal invariance mandates a unique orientation for the surface's direction, we investigated alternative choices and find small numerical sensitivity to different directions. We also calculate the static properties of the low lying pseudoscalar mesons and compare results with existing noncovariant calculations. We conclude that there is a little sensitivity of the calculated observables to the choice of the formalism, provided relativity is properly implemented.

hep-ph↗

arXiv1993

Generalized Relativistic Meson Wave Function

We study the most general, relativistic, constituent $q{\overline q}$ meson wave function within a new covariant framework. We find that by including a tensor wave function component, a pure valence quark model is now capable of reproducing not only all static pion data ($f_π$, $\langle r_π^2 \rangle$) but also the distribution amplitude, form factor $(F_π(Q^2))$, and structure functions. Further, our generalized spin wave function provides a much better detailed description of meson properties than models using a simple relativistic extension of the $S=L=0$ nonrelativistic wave function.

hep-ph↗