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Study on υμ, υγ, Decays and CP Non-Invariance at Early Epoch of the Universe

Authors:	DAI Wusheng GAO Song LI Xueqian

Institution:	1. Departrnent of Physics, Nankai University, Tianjin 300071, China; 2. Institute of High Energy Physics, Academia Sinica, P.O. Box 918(4), Beijing 100039, Chiia

Abstract:	We study the υ_μ and υ_γ decays in the early epoch of the universe. If m_{υ_γ} > 2m_e, there would be a CP asymmetry between υ_γ→e⁺+e^-+υ_e and υ_γ→e⁺+ e^-+ υ_e. The resultant CP non-invariance is a function of temperature and density and can reach l0^-7 for a reasonable temperature range, but it is noticed that if m_{υ_γ} > 2υ_μ～200 MeV, the CP non-invariance can be much larger.

Keywords:	υ _μ υ _γ decays CP non-invariance finite temperature field theory

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