Branching fraction
= Branching fraction
{title2=$B_i=\Gamma_i/\Gamma_{\mathrm{tot}}$}
{wiki}
= Branching ratio
{synonym}
A <branching fraction> is the probability that a decay occurs through a particular mutually exclusive channel, equal to its partial <decay width> divided by the total <decay width>. Inclusive channel fractions sum to one. Rounding displayed fractions can make their numerical sum differ from one.