59,842 research outputs found

    Meson decay in the Fock-Tani Formalism

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    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

    Soft supersymmetry breaking in the nonlinear sigma model

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    In this work we discuss the dynamical generation of mass in a deformed N=1{\cal N}=1 supersymmetric nonlinear sigma model in a two-dimensional (D=1+1D=1+1) 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 1/N1/N 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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