We are not really colliding squarks. We re producing squarks from proton collisions. The point is that the model contains a dark matter candidate, so that any new particle must decay into dark matter eventually. So whatever we produce, dark matter will be involved ;)
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Ok but your are colliding protons to produce hypothetical particles (squarks) which decays into known particles (quarks) and other hypothetical particles (DM). 😋
Yep, as predicted by the full model that contains several dozens of new particles. The heavier ones decaying into the lighter ones decaying themselves into even lighter ones until the lightest: the dark matter candidate.