Abstract
The pion β decay π+→π0e+ν proceeds through
pure weak vector hadronic currents and, therefore, the theoretical
prediction for it is more reliable than for the processes with
axial-vector current contribution. For example, recently the pion
β decay has been used for Vud determination. The main
aim of this letter is to point that kaon β decay K0→K+(π+π0)e−
analogously can be used for this
purpose.
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