https://doi.org/10.1140/epjc/s10052-010-1511-3
A fresh look at η
2(1645), η
2(1870), η
2(2030) and f
2(1910) in
p
→ ηπ0π0π0
1
Queen Mary, University of London, London, E1 4NS, UK
2
Rutherford Appleton Laboratory, Chilton, Didcot, OX11 OQX, UK
3
St. Petersburg Nuclear Physics Institute, Gatchina, St. Petersburg district, 188350, Russia
Received:
9
September
2010
Revised:
3
November
2010
Published online:
12
January
2011
There is a large discrepancy between results of Crystal Barrel and WA102 for the branching ratio R=BR[η 2(1870)→a 2(1320)π]/BR[η 2(1870)→f 2(1270)η]. An extensive re-analysis of the Crystal Barrel data redetermines branching ratios for decays of η 2(1870), η 2(1645), η 2(2030) and f 2(1910). This re-analysis confirms a small value for R of 1.60±0.39, inconsistent with the value 20.4±6.6 of WA102. The likely origin of the discrepancy is that the WA102 data contain a strong f 2(1910)→a 2 π signal as well as η 2(1870). There is strong evidence that the η 2(1870) has resonant phase variation. A peak in f 2(1270)a 0(980) confirms closely the parameters of the a 2(2255) resonance observed previously. A peak in η 2(2030)π is interpreted naturally in terms of π 2(2245) with reduced errors for mass and width M=2285±20(stat)±25(syst) MeV, Γ=250±20(stat)±25(syst) MeV.
© Springer-Verlag / Società Italiana di Fisica, 2011
