2010/09/30 by A. V. Anisovich, C. J. Batty, D. V. Bugg +2 · 10 citations
Physics and Astronomy · #Barrel (horology) #Branching (polymer chemistry) #Branching fraction #Crystal (programming language) #Nuclear physics research studies #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #Resonance (particle physics) #Value (mathematics) #hep-ex #hep-ph
paper · pdf · doi:10.1140/epjc/s10052-010-1511-3
published in The European Physical Journal C 71(1) (Springer Science+Business Media) · 25 pages, 13 figures; several major additions in final version
arxiv created 2010/11/23 · openalex publication_date 2011/01/01 · arxiv updated 2011/02/09 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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.