Fermion regularization, fermion measure and axion fields
classification
⚛️ physics.gen-ph
keywords
fermionthetaaxionfieldsmeasureregularizationtermviolation
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Axion fields were originally introduced to control CP violation due to the theta term in QCD. Pauli-Villars regularization, or the use of a parity symmetric fermion measure, however, preserves CP in the fermion sector. A CP violation arising from the theta term can then be neutralized in a natural way by setting theta equal to zero.
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