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July 31, 2021

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So have pentaquarks also been observed or are they only a theoretical construct so far?

Stu--My understanding is that researchers have observed "signs" leading to inference of the tetraquark particle family members; but, I am not competent/knowledgeable enough to tell you the actual "signs" that are showing up at the Large Hadron Collider. According to Wikipedia, "LHCb is a specialized b-physics experiment, designed primarily to measure the parameters of CP violation in the interactions of b-hadrons (heavy particles containing a bottom quark)."

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