1. The problem statement, all variables and given/known data 5. The Z boson has a width of 2.4952 GeV: a. The Z decays 3.363% of the time in e+e-calculate the partial width of [tex]Z \rightarrow e+e-[/tex]. b. The [tex]J/ \psi[/tex] (A cc bar state) has a width of 93.4 KeV. Is its lifetime is longer or shorter than the Z lifetime? Explain. c. Calculate the [tex]J/ \psi[/tex] lifetimes. 2. Relevant equations None given. 3. The attempt at a solution (a) I think: 2.4952/100*3.363=0.084GeV is correct but I'm not sure why? (b) I figure a bigger E means a smaller t, so it would be longer, but again I'm not sure of the physics... (c) I have no idea how to start... does [tex]J/ \psi[/tex] lifetimes have another more google friendly search name? Thanks!