B May, KD Duch, M Heel, H Kalinowsky, F Kayser… - Physics Letters B, 1989 - Elsevier
A new isoscalar ππ resonance AX (1565) has been observed at a mass of 1565±10 MeV/c2
and a width of 170±20 MeV/c2. The resonance is produced in pp annihilation at rest into π+ …