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arXiv · hep-ph/9805428

Wave Function Renormalization at Finite Temperature

S. Esposito·G. Mangano·G. Miele·O. Pisanti
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Abstract

We present a derivation of the medium dependent wave function renormalization for a spinor field in presence of a thermal bath. We show that, as already pointed out in literature, projector operators are not multiplicatively renormalized and the effect involves a non trivial spinor dependence, which disappears in the zero temperature covariant limit. The results, which differ from what already found in literature, are then applied to the decay of a massive scalar boson into two fermions and to the $β$--decay and crossed related processes relevant for primordial nucleosynthesis.

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S. Esposito, G. Mangano, G. Miele, O. Pisanti. 1998-05-22. Wave Function Renormalization at Finite Temperature. https://doi.org/10.1103/physrevd.58.105023

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