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Pion Beta Decay

The processes known as pion beta decays or pibeta are the beta decays of the charged pions:

The final states involve mesons and leptons and are consequently known as semileptonic decays. In addition, pibeta is a transition between two spin zero members of an isotriplet: the pions are spin zero bosons with negative parity and isospin one. Therefore, one expects only the vector current to contribute to the hadronic matrix element. The axial vector contribution must vanish as explained in chapter one.

Bernward Krause
Mon Jan 15 14:57:06 MET 1996