Observation of f0(1770)→ηη in reactions from 600 to 1200 MeV/c

Light2++and0++mesons

“…4 [18]. There is a further observation of a well-defined 0 þþ signal in in Crystal Barrel data in flight at 1770 AE 12 MeV with width 220 AE 40 MeV [39]. The mass is 4 standard deviations above f 0 ð1710Þ and the width is 2 standard deviations higher.…”

“…The conclusion is that none of the states listed in the first half of the table is dominantly s" s. Amongst recognized or possible s" s states, a small signal from f 2 ð1525Þ can be detected in Crystal Barrel data for K " K and via its interference with f 0 ð1500Þ [10,14]. The f 0 ð980Þ appears as a dip in the Dalitz plot for " pp !…”

“…0 [14] as presenting evidence that there is a state at 2105 AE 10 MeV consistent with the f 2 ð2150Þ. In fact, the paper presented a careful study of both the angular distribution, which is flat, and the energy dependence of production (which is different for production of J ¼ 2 and 0); the conclusion from both sources is that the signal is due to f 0 ð2105Þ, which is observed in many sets of data and unambiguously has J P ¼ 0 þ .…”

Revisiting scalar glueballs

“…This non-observation of f 0 (1710) in pp has been used to argue that it is ss dominated. However, this argument is moot since the analysis of [68] based on WA102 data and Fermilab E835 experiment [69] saw both f 0 (1500) and f 0 (1710) in pp → ηηπ 0 .…”

Proton-antiproton annihilation to gluons and the status of glueballs

“…The data and results presented here are at variance with the ones reported in ref. [8] which assumed a vertex at the center of the detector.…”