This event from the Higgs Hunters project is a prime, lovely example of what we’re hunting for in that project: a well-defined four-track off-center vertex (OCV). Researcher andy.haas provided some additional insight into exactly what happened here:
Beautiful! This is clearly a “hadronic interaction.” A standard particle (like a pion) has come from the collision and hit a bit of material (probably a silicon tracking detector sensor) in the detector, producing a secondary assortment of standard charged particles, which we see as displaced tracks coming from the displaced vertex. You can tell because the vertex is found exactly at a layer of tracking detector—the third layer, in both the normal and slice views.
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