Improving the Hartree-Fock approximation by including nonzero decay widths
نویسندگان
چکیده
We studied the linear sigma model withO(N) symmetry at nonzero temperature in the framework of the CornwallJackiw-Tomboulis formalism [1, 2]. Extending the set of two-particle irreducible diagrams by adding sunset diagrams to the usual Hartree-Fock contributions, we derived a new approximation scheme which extends the standard Hartree-Fock approximation by the inclusion of nonzero decay widths. In this approximation, in-medium modifi cations of the meson masses as well as decay and collisional broadening effects are self-consistently taken into account.
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