A search for axial vectors in anti-p.p -> K+-.Kmiss0.pi+-.pi+.pi- annihilations at rest in gaseous hydrogen at NTP

Abstract The study of the K ± K miss 0 π ∓ π + π − channel (7016 events), from p p annihilations in a gaseous hydrogen target at NTP, with the OBELIX spectrometer at LEAR (CERN), is presented. A spin-parity analysis provides evidence for two axial vectors, one in the low K K π mass region, the well established f 1 (1285), decaying to a 0 (980) π , the second, the 1 ++ component of the old puzzling E l , the f 1 (1420), decaying mainly to K ∗ K , seen for the first time in p p annihilation at rest. The analysis confirms the dominant production of the pseudoscalar η(1405), decaying mainly to (Kπ) S K , and the existence of a second pseudoscalar in the same mass region, the η(1460), decaying mainly to K ∗ K .