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[SOLVED] Lifetime & Branching ratio
Hi!
In my book Particle Physics by Martin & Shaw, eq 2.15:
Lifetime:
[tex] \tau _l = \dfrac{B(l^- \rightarrow e^-\bar{\nu }_e\nu _l )}{\Gamma (l^-\rightarrow e^-\bar{\nu }_e\nu _l )} [/tex]
Where B is branching ratio and Gamma the decay rate and l is a lepton.
Why is B included? :S I thought the lifetime just was the inverse of the decay rate...
Hi!
In my book Particle Physics by Martin & Shaw, eq 2.15:
Lifetime:
[tex] \tau _l = \dfrac{B(l^- \rightarrow e^-\bar{\nu }_e\nu _l )}{\Gamma (l^-\rightarrow e^-\bar{\nu }_e\nu _l )} [/tex]
Where B is branching ratio and Gamma the decay rate and l is a lepton.
Why is B included? :S I thought the lifetime just was the inverse of the decay rate...