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Do any has an idea how to give a rough estimation for this process's cross section:

g g -> H -> h h, (h -> b b~), ( h -> b b~) ?

where h is SM Higgs and H is a heavy Higgs boson with BR (H > hh) ~ Gamma (H > hh) ~ 10^-3 GeV and sigma (g g > H ) ~ 10 pb ..

When I calculated it by cross section calculator like MadGraph (https://launchpad.net/mg5amcnlo) it gives sigma ~ 0.2 pb, also sigma (g g -> H -> h h) ~ 10^-1 pb, but I don't understand how these values calculated ..

Note that MG doesn't use Narrow width approximation , i.e., sigma (g g -> H -> h h, (h -> b b~), ( h -> b b~)) not equivalent to sigma (g g -> H -> h h) BR (h -> b b~) BR ( h -> b b~)