Physics:Partial width
From HandWiki
This term is used as a synonym for the partial cross-section of one of several competing reactions, i.e. is directly proportional to a branching ratio. The term comes from the level widths of excited nuclei with different lifetimes 
. Lifetime and decay width 
are related by the Heisenberg uncertainty principle
where 
for 
in s and in GeV. The total lifetime is then given by
or the total width by
An individual relative branching ratio is given by 
.
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