The generalised relativistic Lindhard functions
M. B. Barbaro, R. Cenni, M. R. Quaglia
Abstract
We present here analytic expressions for the generalised Lindhard function, also referred to as Fermi Gas polarisation propagator, in a relativistic kinematic framework and in the presence of various resonances and vertices. Particular attention is payed to its real part, since it gives rise to substantial difficulties in the definition of the currents entering the dynamics.
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