What is the mass and lifetime of the φ meson?

[Darkkk]

An electron and a positron are collided head on such that all their energy is used to produce a φmeson. The number of observed φ mesons is found to be inversely proportional to (E−E0)+Γ²/4. where E is the total centre of mass collision energy, E0=1019 MeV and Γ=4.26MeV

What is the mass and lifetime of the
φmeson?


Hi feeling rather frustrated with this question, not sure where to start really! any advice would be most appreciated! thanks

 

[vela]

That expression isn't correct. The units don't work out.

Hint: Look up the Breit-Wigner distribution.

 

[Darkkk]

OK so this is how far I got with this one...

found the mean lifetime using

$$\tau=(h/2\pi)/\Gamma$$

This gave me a value of 1.5x10^-22

Is that correct?

also still stumped on how to find the mass...