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Following Caron-Huot and combining results for the thermal dependence ofspectral functions at large time-like momenta, we write an explicit expressionfor the thermal width of the Higgs boson to $\mathcal{O}(\alpha_\mathrm{s})$for $T \ll M_H$. It is an $\mathcal{O}( \alpha_\mathrm{s} (T/M_H)^4 )$correction for $H\to gg$ and $H\to q\bar{q}$. We also compile correspondingresults for the thermal width of the $Z$-boson, and we recall which genericstructures of the field theory, accessible via the operator product expansion,fix the $T/M$-dependence of the decay of heavy particles.

Thermal width of the Higgs boson in hot QCD matter