K? decays of 0++ glueball candidates from bubble chambers LEAR

The signals of the KK decays of two JPC = 0++ isoscalars, f0(1.4) and f0(1.5), are directly observable in the channels of annihilations at rest pp → KSKSπ0 in liquid H2 and pn → KSKSπ− in liquid D2. Both states are relatively narrow: Γ(1.4)∼ 200 MeV, Γ(1.5) ∼ 100 MeV. The ratios between the invariant couplings to KK and ππ of f0(1.4) and f0(1.5) are of the order of 0.5. A prominent structure mainly generated by the a0(1.4) and f0(1.4) amplitudes is one of the main features of the K+K−π0 channel of pp annihilations in liquid H2. The existence of the f0(1.4) and f0(1.5) besides the f0(0.98) makes one of these three mesons in excess to be accomodated in the 0++ nonet. The ratios between the invariant couplings KK and ππ are not compatible with ideal mixing of the 0++ nonet and support the hypothesis that both f0(1.4) and f0(1.5) may have a large gg component. Spontaneous polarization of pp annihilations at rest causes striking effects in the K+K−π0 final state. A global polarization and isospin analysis of pN → KKπ annihilation channels is necessary for reliable determinations of mass, width and decays of the f0 mesons.