48,495 research outputs found
Meson decay in the Fock-Tani Formalism
The Fock-Tani formalism is a first principle method to obtain effective
interactions from microscopic Hamiltonians. Usually this formalism was applied
to scattering, here we introduced it to calculate partial decay widths for
mesons.Comment: Presented at HADRON05 XI. "International Conference on Hadron
Spectroscopy" Rio de Janeiro, Brazil, August 21 to 26, 200
Glueball-glueball scattering in a constituent gluon model
In this work we use a mapping technique to derive in the context of a
constituent gluon model an effective Hamiltonian that involves explicit gluon
degrees of freedom. We study glueballs with two gluons using the Fock-Tani
formalism. In the present work we consider two possibilities for : (i)
as a pure and calculate, in the context of a quark interchange
picture, the cross-section; (ii) as a glueball where a new calculation for this
cross-section is made, in the context of the constituent gluon model, with
gluon interchange.Comment: Proceedings of the International Workshop IX Hadron Physics and VII
Relativistic Aspects of Nuclear Physics (HADRON-RANP 2004
Soft supersymmetry breaking in the nonlinear sigma model
In this work we discuss the dynamical generation of mass in a deformed supersymmetric nonlinear sigma model in a two-dimensional ()
space-time. We introduce the deformation by imposing a constraint that softly
breaks supersymmetry. Through the tadpole method, we compute the effective
potential at leading order in expansion showing that the model exhibit a
dynamical generation of mass to the matter fields. Supersymmetry is recovered
in the limit of the deformation parameter going to zero.Comment: 9 pages, 2 figures. Revised version. arXiv admin note: text overlap
with arXiv:1308.471
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