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Line 17: </math> The first and third terms are the CP-symmetric [[kinetic ~~terms~~term]]s of the [[gauge theory\|gauge]] and quark fields. The fourth term is the quark mass term which is CP violating for non-zero phases <math>\theta' \neq 0</math> while the second term is the so-called [[theta vacuum\|θ-term]] or “vacuum angle”, which also violates CP-symmetry. Quark fields can always be redefined by performing a chiral transformation by some angle <math>\alpha</math> as

Strong CP problem: Difference between revisions