Four all new exotic particles

LHCb has recently observed four new exotic-like particles in the decay of the $B^+$:
he properties of these structures are consistent with their interpretation as four-quark particles, which are considered as "exotic", (hence the "exotic-like" name in the title), although the details of the four quark $c{\bar c}s{\bar s}$ binding mechanism is still under discussion.
Read also paper 1 and paper 2

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