Comment on "Role of heavy meson exchange in near threshold N N --> d pi"
J. A. Niskanen
Abstract
In a recent paper by C. J. Horowitz (Phys. Rev. C 48, 2920 (1993)) a heavy meson exchange is incorporated into threshold NN --> d pi to enhance the grossly underestimated cross section. However, that calculation uses an unjustified assumption on the initial and final momenta, which causes an overestimate of this effect by a factor of 3--4. I point out that the inclusion of the Delta(1232) isobar increases the cross section significantly even at threshold.
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