Kinematics & Models The differential decay rate to a point s =(s1,…,sn) in n dimensional phase space can be expressed as
dΓ=|Μ(s)|2|(e)nφ/(e)(s1 … sn)|dns (1)
where |(e)nφ/(e)(s1… sn) represents the density of states at s,and M the matrix element for the decay at that point in phase space.