Introduction In the last 30 years we have made great progress both ...
Introduction In the last 30 years we have made great progress both ...
Introduction In the last 30 years we have made great progress both ...
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Coannihilation and Beps parameterAs a rule <strong>we</strong> <strong>have</strong> several particles in odd sector. We assumethat all of <strong>the</strong>m are in chemical equilibriumNi / Nj = exp ( -( mi – mj )/T)All reactions like ~i,~j -> SM are responsible for DM formation.This is a reason <strong>we</strong> need a lot of matrix elements to to calculatecoannihilation channels. But density of heavy odd particles issuppressed my Boltzmann factor an can be omitted.We <strong>have</strong> Beps parameter which cuts calculation of suppressedcoannihilation channels:~i, ~j -> SMIs omitted ifExp( -(mi + mj – 2*Mcdm)/T) < BepsDefault value Beps = 1.E-3.29
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