For few body systems, the treatment of charge symmetry breaking (CSB) that is based on meson‐exchange models is being replaced by effective field theories whose CSB originates in the down‐up quark mass difference and quark electromagnetic effects. In parallel, two new observations of CSB in π0 production (the fore‐aft asymmetry in n+p→d+π0 and the total cross section for d+d→4He+π0) provide applicable data.
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© 2007 American Institute of Physics.
2007
American Institute of Physics
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