Magnitude of the cosmological baryon asymmetry

We have examined the magnitude of the cosmological baryon asymmetry arising in several of the standard models of $\mathrm{CP}$ violation. Agreement with the experimental baryon to photon number ratio $\frac{n_B}{n_{\gamma }}\approx {10}^{-8\mathrm{}}$ is obtained in models where superheavy Higgs mesons decay with complex amplitude into other Higgs mesons. By contrast, in the Kobayashi-Maskawa model $\frac{n_B}{n_{\gamma }}\approx O\left({10}^{-20\mathrm{}}\right)$.