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Charge symmetry breaking in pion production

J. A. Niskanen
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Abstract

Chiral effective field theory predicts a charge symmetry violating (CSB) amplitude for pion-nucleon scattering. This mechanism provides a very large contribution also to the CSB forward-backward asymmetry in the angular distribution of the reaction pn --> d pi0. This contribution was so large that it had a potential to cause a large effect also in CSB elastic NN scattering and to disturb its present understanding. However, it can be seen that, contrary to pion production, in this case the ud-quark mass difference and the electromagnetic contribution to the np-mass difference tend to cancel causing the total effect in the effective range parameters Delta a = a_pp - a_nn and Delta r_0 = r_0,pp - r_0,nn to be relatively small. In the lowest order and within the static approximation for the nucleons CSB pion-nucleon rescattering does not influence np scattering.

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J. A. Niskanen. 2002-07-16. Charge symmetry breaking in pion production. https://doi.org/10.1142/9789812791351_0032

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