Evidence for a narrow NN state at 2.02 GeV/c2 in 6 and 9 GeV/c antiproton interactions

Abstract We report evidence for the existence of a charged narrow state of mass M ∼ 2.02 GeV/ c 2 and widtt Γ ⪅ 0.04 GeV/ c 2 , decaying into N N . The state is observed in the reaction p p → p fast n π + π − π − at 6 GeV/ c and in p p →π fast + p n π + π − at 9 GeV/ c in a triggered bubble chamber experiment at the SLAC Hybrid Facility.