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I am sure there are hadrons containing top quark(s), but they have not been observed. The things preventing the observation of such hadrons are:

  • one top quark by itself has roughly the mass of an entire tungsten atom, this means it takes an enormous amount of energy just to create just one top quark
  • the top quark is very unstable with a halflife of about 5E-25 seconds, this means that for all practical purposes all top quarks created will be gone within only about 25E-25 seconds so they are very unlikely to even have a chance to find other quarks to form hadrons with and if they did form a hadron it would decay rapidly
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9y ago

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