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User-generated article on the Large Hadron Collider (LHC) built by CERN is the world's largest higest-energy particle accelerator intended to collide opposing beams of either protons. — “Wikipedia: Large Hadron Collider”, en.wikipedia.org
All hadrons except protons are unstable and undergo particle decay–however neutrons are stable inside atomic nuclei. However these are not the only hadrons; a great number of them have been discovered and continue to be discovered (see list of baryons and list of mesons). — “Hadron - Wikipedia, the free encyclopedia”, en.wikipedia.org
That is, exotic hadrons do not have the same quark content as ordinary hadrons: exotic baryons have more than just the three quarks of ordinary baryons and exotic mesons do not have one Exotic hadrons can be searched for by looking for particles with quantum numbers. — “Exotic hadron - Wikipedia, the free encyclopedia”, en.wikipedia.org