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The two-body currents for s-wave pion photoproduction on the NN system arederived to O(Q^4) in chiral perturbation theory. For the interesting case of3S1 <-> 1S0 transitions, we show that an axial isovector two-nucleon contactterm connects the short-distance physics of pion photoproduction to pionproduction and several important electroweak reactions. We also find that thestandard chiral Lagrangian gives a gamma pi pi N N vertex that have not beenexplicitly mentioned in previous literature. The corresponding Feynman rule ispresented here and some processes where it should be important are brieflydiscussed.Comment: 9 pages, REVTeX, 1 eps figur

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

Chiral<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:mi mathvariant="script">O</mml:mi></mml:mrow><mml:mo stretchy="false">(</mml:mo><mml:msup><mml:mi>Q</mml:mi><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msup><mml:mo stretchy="false">)</mml:mo></mml:mrow></mml:math>two-body operators for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>s</mml:mi></mml:mrow></mml:math>-wave pion photoproduction on the…

ChiralO(Q4)two-body operators fors-wave pion photoproduction on the…