https://www.youtube.com/watch?v=mqfD75rzzpc
https://phys.org/news/2019-03-physicists-class-pentaquarks.html?fbclid=IwAR345zjw0fksdGUJ0n6J0lv0bLAqRDVBxHMlNMl_blNfCeGZJ8zCf989r-U What is unique about each of these three pentaquarks is that its mass is slightly lower than the sum of its parts—in this case, the masses of the baryon and meson. "The pentaquark didn't decay by its usual easy, fall-apart process," Skwarnicki says. "Instead, it decayed by slowly and laboriously rearranging its quarks, forming a narrow resonance." via Physicists discover new class of pentaquarks.