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Pion Decay Constant at Finite Temperature in the Nonlinear Sigma Model

Sangyong Jeon, Joseph Kapusta

hep-pharXiv:hep-ph/9602400

Abstract

We calculate the pion decay constant near the critical temperature of the O(N) nonlinear sigma model in the large N limit. Making use of the known low temperature behavior, we construct a Padé approximant to obtain the behavior of fπ(T) at all temperatures.

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