Problem of Strong <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>P</mi></math></span> and <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>T</mi></math></span> Invariance in the Presence of Instantons

F. Wilczek

doi:10.1103/PhysRevLett.40.279

Problem of Strong $P$ and $T$ Invariance in the Presence of Instantons

F. Wilczek

Phys. Rev. Lett. 40, 279 – Published 30 January 1978

Abstract

The requirement that $P$ and $T$ be approximately conserved in the color gauge theory of strong interactions without arbitrary adjustment of parameters is analyzed. Several possibilities are identified, including one which would give a remarkable new kind of very light, long-lived pseudoscalar boson.