## Higgs Decay

Hello,

In the process $H$ -> $c$+$\bar{s}$+$W^-$, where $c$ is the charm quark, $\bar{s}$ the anti strange quark, in tree level I wrote the diagrams sent in attachment.

Diagram 1.pdf

Diagram 2.pdf

Diagram 3.pdf

My question is: does the third diagram exist? I do know that the $s$ quark can't decay to the charm quark since it's mass is inferior to the mass of the charm quark. But in that diagram the strange quark is virtual so...there comes my confusion...

Thank you
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 Yes, it exists. The s can't be on-shell in that process; but, then, the c can't be on-shell in diagram 2 either, so there's not really that big a distinction.
 oh you're right. I was so focused in the quarks' masses that I didn't even think about the W boson. Thank you very much

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