Four-quark particle found - May be entirely new form of matter

Physicists work eagerly to find all particles predicted by the Standard Model. However, our universe can sometimes trick us and spit out some entirely new forms of matter. That is what could have happened recently at the Belle experiment in Japan and the Beijing Spectrometer Experiment (BESIII) in China where a subatomic particle with four-quarks was found for the first time.

One may think that our understanding of the universe will become complete as we manage to find the missing pieces of the Standard Model. But what if we keep finding such exotic particles instead of the predicted ones? Should we rephrase our theories at some point in the future the same way as our brilliant scientists did at the dawn of the 20th century?

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