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The observation of a new type of pentaquark and the first duo of tetraquarks at CERN, the Geneva-area home to the Large Hadron Collider, offers a new angle to assess the “strong force” that holds together the nuclei of atoms.

The new pentaquark decays into particles that none of the others produce, while the two tetraquarks have the same mass, suggesting they may be the first known pair of exotic structures.

Scientists at the Large Hadron Collider in Switzerland have discovered one new pentaquark and two tetraquarks.

They also find a lighter pentaquark at 4312 MeV.

The lightest pentaquark has a mass just below the sum of a particular baryon and meson that together contain the correct quark ingredients.