Weak, Strong and electromagnetic force are mediated via bosons. I've come across the Walecka-model where the exchange particles are $\sigma$ and $\omega$ mesons; bosons again. why are interactions always mediated via bosons (not fermions)?
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1I just found my answer... https://physics.stackexchange.com/q/81414/ – dan-ros Jul 04 '14 at 21:46
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That's true, I also had the same question, but does one interpret something like triangle diagrams? Isn't a part of the interaction mediated via fermions? – Hydro Guy Jul 05 '14 at 13:00