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The near-threshold n p -> d pi0 cross section is calculated in chiralperturbation theory to next-to-leading order in the expansion parameter sqrt{Mm_pi}/Lambda_chi. At this order irreducible pion loops contribute to therelevant pion-production operator. While their contribution to this operator isfinite, considering initial-and final-state distortions produces a lineardivergence in its matrix elements. We renormalize this divergence byintroducing a counterterm, whose value we choose in order to reproduce thethreshold n p -> d pi0 cross section measured at TRIUMF. The energy-dependenceof this cross section is then predicted in chiral perturbation theory, beingdetermined by the production of p-wave pions, and also by energy dependence inthe amplitude for the production of s-wave pions. With an appropriate choice ofthe counterterm, the chiral prediction for this energy dependence convergeswell.Comment: 25 pages, REVTeX4, 5 eps figures, 1 reference added, 1 removed,  changed cutoffs shown in Table III, some improvements in the text and  figures, conclusions unaltered, accepted by PR

physical review. c. nuclear physics/physical review. c, nuclear physics

Near-threshold<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="italic">NN</mml:mi><mml:mo>→</mml:mo><mml:mi>d</mml:mi><mml:mi>π</mml:mi></mml:mrow></mml:math>reaction in chiral perturbation theory

Near-thresholdNN→dπreaction in chiral perturbation theory