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We consider the application of heavy fermion formalism based chiralperturbation theory to meson production in nucleon-nucleon collisions. It isshown that for one loop contributions the heavy fermion formalism expansioncorrections for the nucleon propagator produce infinite series of correctionterms which are of the same momentum power order. This destroys the one-to-onecorrespondence between the perturbative and small momentum expansion and thusnegates the application of any finite order heavy fermion formalism chiralperturbation theory to the $NN\to NN \pi$ reactions.Comment: 13 pages, 3figure

On convergence of the χPT HFF expansion for one loop contribution to meson production in NN collisions