Resonant behavior of the pp -+ (pp1s?0 reaction at the energy ,/s=2.65 GeV

We report on measurements of the differential cross section du/dS2 in the energy region of .,/s = 2.5-2.9 GeV of the reaction pp -> {pp}s pi 0, where {pp}s is a 1S0 proton pair. The experiment has been performed with the ANKE spectrometer at COSY-Julich. The data reveal a peak in the energy dependence of the forward {pp}s differential cross section at the energy .,/s = 2.65 GeV with the width I' = 0.26 GeV, and also the cross section slope changes its sign in the region of the observed peak. This is an indication for the excitation of a new D(2650) resonant state, that may be a dibaryon resonance system consisting of two excited baryons Delta(1232)