1. The problem statement, all variables and given/known data Work out the branching ratio of (W --> e-Ve) The book uses fermi's golden rule to do it, but im wondering if my different solution is also valid? 2. Relevant equations Γ = 1/τ and ΔEΔT = hbar 3. The attempt at a solution If ΔEΔT = hbar, then i can write ΔT = hbar/ΔE Therefore Γ = 1/ΔT = ΔE/hbar should give me an approximate value of the branching ratio.... Can anyone tell me if this is a valid approach to find the branching ratio for a particle decay? If not please let me know of any easy way to do it, im sure there is one i just cant find it!!