Chiral O(Q^4) two-body operators for s-wave pion photoproduction on the NN system

Details Chiral O(Q^4) two-body operators for s-wave pion photoproduction on the NN system Chiral O(Q^4) two-body operators for s-wave pion photoproduction on the NN system

2006-04-16

arxiv.org/abs/nucl-th/0604035v1

Phys.Rev.C74:017001,2006

Physics

Nuclear Physics

Nuclear Theory

9 pages, REVTeX, 1 eps figure

Scientific paper

10.1103/PhysRevC.74.017001

The two-body currents for s-wave pion photoproduction on the NN system are derived to O(Q^4) in chiral perturbation theory. For the interesting case of 3S1 <-> 1S0 transitions, we show that an axial isovector two-nucleon contact term connects the short-distance physics of pion photoproduction to pion production and several important electroweak reactions. We also find that the standard chiral Lagrangian gives a gamma pi pi N N vertex that have not been explicitly mentioned in previous literature. The corresponding Feynman rule is presented here and some processes where it should be important are briefly discussed.

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