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At order $g_s^2$, usually only a triangle quark loop and box diagram are considered, I was wondering, is there some reason that excludes these diagrams from the possible standard model channels?

loop to higgs

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    $\begingroup$ Your first diagram violates color conservation: a color gluon cannot go to a colorless Higgs via a top loop! Your second one, twisted around, would be the normal "triangle" diagram, except emitting a further Higgs off the top line, requiring much higher energy... much ... $\endgroup$ – Cosmas Zachos Jun 10 at 22:14
  • $\begingroup$ Thank you, I understand about the first diagram. About the second, it is not the same as a triangle loop diagram, it is similar to the box diagram for Higgs pair creation from gluons, however, the order of the vertices is changed ggHH $\rightarrow$ gHgH. $\endgroup$ – Physicist_285 Jun 11 at 9:11
  • $\begingroup$ It is always understood in these diagrams that the ones with permitted order are always implied! $\endgroup$ – Cosmas Zachos Jun 11 at 10:44

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