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CP -nonconserving effects in quantum chromodynamics

1979; American Physical Society; Volume: 19; Issue: 7 Linguagem: Inglês

10.1103/physrevd.19.2227

1538-4500

Varouzhan Baluni,

Quantum Chromodynamics and Particle Interactions

The instanton-generated $\mathrm{CP}$-violating perturbation is shown to have a form $\frac{3\overline{\ensuremath{\theta}}{m}_{u}{m}_{d}{m}_{s}}{({m}_{u}{m}_{d}+{m}_{u}{m}_{s}+{m}_{d}{m}_{s})}(\overline{\ensuremath{\psi}}i{\ensuremath{\gamma}}_{5}\ensuremath{\psi})$ for $\overline{\ensuremath{\theta}}\ensuremath{\ll}1$. The induced neutron electric dipole moment, evaluated in the framework of the MIT bag model, is ${d}_{n}=8.2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}16}\overline{\ensuremath{\theta}}e$ cm.