Particle decays Flashcards
1
Q
What is Fermi’s golden rule?
A
The transition rate from one state to another is proportional to the physics as drawn in the Feynman diagram
2
Q
What particles do not decay?
A
Electron
Proton
Neutrino
3
Q
What is the decay rate?
A
Γ=1/τ
So: N(t)=N(0)e^(-Γt)
4
Q
How do we find the decay rate?
A
Find the characteristic decay rate for each channel and sum for all channels
5
Q
What is the Branching fraction?
A
BF(i)=Γ_i/(∑r_i )=Γ_i/Γ_total
