feynlag.pheno.loop.higgs_gammagamma_width

feynlag.pheno.loop.higgs_gammagamma_width(m_h, m_t, m_W, v, alpha, quarks=((0.6666666666666666, 3),))

$Gamma(htogammagamma)=frac{alpha^2 m_h^3}{256pi^3 v^2} big|A_1(tau_W)+sum_f N_c Q_f^2 A_{1/2}(tau_f)big|^2$.

Parameters:

quarks – iterable of (Q_f, N_c) for the fermion loops (default: the top quark, $Q=2/3$, $N_c=3$ — the only numerically relevant one).

Returns:

the width (same units as $m_h$; multiply by $10^6$ for keV when $m_h$ is in GeV).