# Higgs to gluon gluon vertex

Asked by
Safinaz

Dear Calchep authors,

I'd like to ask about the higgs coupling to gluon gluon at func3.mdl,

LmbdGG : did you use here the Higgs effective field theory (heft) model ?

where the coupling defined by the approximation:

g_hgg = alpha_s/3* pi*vev (1 + 7/30 tau + 2/21 tau^2 + 26/525 tau^3 + ..), tau = m_h^2/4m_t^2,

but I try to understand the syntax of LmbdGG, it's not like this definition ..

Also there are some symbols I can't get like :

cabs (HggF((

What is cabs, HggF and why Mcp is here ?

Thanks,

Safinaz

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- Alexander Pukhov

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