- #1
Anchovy
- 99
- 2
I'm trying to understand how the SU(5) prediction for the proton decay lifetime of [itex]\tau_{p} \sim10^{31}[/itex] yr has been arrived at. I keep seeing it stated that [itex]\tau_{p} \sim \frac{4\pi}{g_{5}^{2}} \frac{M_{X}^{4}}{M_{p}^{5}}[/itex] where [itex]g_{5}[/itex] is the SU(5) coupling and [itex]M_{X,p}[/itex] are the X boson and proton masses. However, I'd like to understand where this expression for comes from and see the full equation. Anyone know?