Decays of the f0(1370) scalar glueball candidate in pp Central Exclusive Production (CEP) and in antiproton annihilations at rest

Decays into π+ π- of the f0 (1370) are the main source of an isolated structure localized between 1.2 and 1.5 GeV in the π+ π- mass spectrum measured in pp Central Exclusive Production (CEP) at √s=200 GeV at very low four momentum transfer ltl by the STAR experiment. These data confirm in the π+ π- decay channel the existence of the f0 (1370) as an isolated well identified structure previously observed in K+ K- , Ks Ks , π+ π- π+ π- , 2π0 π+ π- and 4π0 decays measured in pbar annihilations at rest. The ensemble of these data point at a high gg content of the f0 (1370). CEP interactions at higher energies favour production of 0++ and 2++ mesons. Selection of events with lower ltl at both proton vertices suppresses 2++ structures. LHC runs dedicated to pp CEP measurements at low ltl could then provide a unique source of all the low energy scalars. This would make it clear if and where scalar gluonium is resident and the nature (composition in terms of qqbar, qqqbarqbar, qqbar-qqbar and gg) of f0 (500), f0 (980), f0 (1370), f0 (1500) and f0 (1710).