Effective window function for Lagrangian halos

An Effective Lagrangian Approach for Unstable Particles

We propose a novel procedure for handling processes that involve unstable intermediate particles. By using gauge-invariant effective Lagrangians it is possible to perform a gauge-invariant resummation of (arbitrary) self-energy effects. For instance, gauge-invariant tree-level amplitudes can be constructed with the decay widths of the unstable particles properly included in the propagators. In ...

Effective hadronic Lagrangian for charm mesons

An effective hadronic Lagrangian including the charm mesons is introduced to study their interactions in hadronic matter. Using coupling constants that are determined either empirically or by the SU(4) symmetry, we have evaluated the absorption cross sections of J/ψ and the scattering cross sections of D and D∗ by π and ρ mesons.

An Effective Lagrangian for Low-Scale Technicolor

We present an effective Lagrangian for low-scale technicolor. It describes the interactions at energies <∼MρT of the lowest-lying bound states of the lightest technifermion doublet — the spin-one ρT , ωT , aT , fT and the corresponding technipions πT . This Lagrangian is intended to put on firmer ground the technicolor straw-man phenomenology used for collider searches of low-scale technicolor....

Effective Lagrangian for scale-invariant quantum electrodynamics.

A Supersymmetric Effective Chiral Lagrangian

We construct in a manifestly supersymmetric form the leading and subleading terms in momentum for an effective supersymmetric chiral Lagrangian in terms of complex pions and their superpartners. A soft supersymmetry breaking term is included and below the super-symmetry breaking scale the Lagrangian reduces to the usual bosonic chiral Lagrangian in terms of real pions.