Study of $\pi^{-}p\rightarrow\pi^{-}\eta(\eta) p$ at 190 GeV with COMPASS

The COMPASS experiment at CERN studies diffractively produced states in the light quark sector with unprecedented statistics. The observation of $f_{0}$(1500)/ $f′_{2}$ (1525) decaying to $\eta\eta$ in 2008 data with incoming negative pion beam at 190 GeV/c poses the question whether it is produced centrally or formed by the decay of a heavier diffractively produced $\pi_{1}$(1800)$/\pi_{2}$(1880). To decide, a dedicated amplitude analysis which includes different production mechanisms is formulated and compared with one which was used to fit centrally produced resonances including $f_{0}$(1500) by the WA102 experiment. Unbinned mass-dependent log-likelihood fitting methods may serve to solve the ambiguities which are present in binned, mass-independent partial wave analyses.