Study on $ν_μ$, $ν_τ$ Decays and CP-Non Invariance at Early Epoch of the Universe

Details Study on $ν_μ$, $ν_τ$ Decays and CP-Non Invariance at Early Epoch of the Universe Study on $ν_μ$, $ν_τ$ Decays and CP-Non Invariance at Early Epoch of the Universe

1996-05-21

arxiv.org/abs/hep-ph/9605366v1

Commun.Theor.Phys. 29 (1998) 271-276

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages(LaTeX), uuencode, 2 figures(1 PS file)

Scientific paper

We study the $\nu_{\mu}$ and $\nu_{\tau}$ decays in the early epoch of the universe. If $m_{\nu_{\tau}}>2m_e$, there would be a CP asymmetry between $\nu_{\tau}\rightarrow e^++e^-+\nu_e$ and $\bar{\nu}_{\tau} \rightarrow e^++e^-+\bar{\nu}_e$. The resultant CP non-invariance is a function of temperature and density and can reach $10^{-7}$ for a reasonable temperature range, but it is noticed that if $m_{\nu_{\tau}}>2m_{\mu}\sim 200$ MeV, the CP non-invariance can be much larger.

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