Abstract
The free neutron is unstable. It can decay into a proton with emission of an electron and an electron antineutrino. The mean lifetime of the free neutron is about 15 minutes. In contrast, the free proton seems stable. To date, no proton decay has been observed. In this article, we discuss the possibility of proton decay within the Standard Model which describes the elementary particles and their interactions. With the grand unified theory that describes the elementary particles and fundamental interactions in higher energy range, we discuss the possibility of the proton decay. Some of theoretical predictions for free proton decay in extremely high energy range are given and compared with the estimated lower limits of the lifetime in recent experiments of the possible free proton decay.
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