The scalar-isoscalar spectral function of strong matter in a large N approximation
Abstract
The enhancement of the scalar-isoscalar spectral function near the two-pion threshold is studied in the framework of an effective linear σ model, using a large N approximation in the number of the Goldstone bosons. The effect is rather insensitive to the detailed T=0 characteristics of the σ pole, it is accounted by a pole moving with increasing T along the real axis of the second Riemann sheet towards the threshold location from below.
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