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The reaction pp -> dpi+eta has been measured at a beam energy of T=2.65 GeV(p=3.46 GeV/c) using the ANKE spectrometer at COSY-Juelich. The missing massdistribution of the detected dpi+ pairs exhibits a peak around the eta mass ontop of a strong background of multi-pion pp -> dpi+(n(pi)) events. Thedifferential cross section d^4(sigma)/d(Omega_d)d(Omega_pi+)d(p_d)d(p_pi+) forthe reaction pp -> dpi+eta has been determined model independently for tworegions of phase space. Employing a dynamical model for the a0+ productionallows one then to deduce a total cross section of sigma(pp -> da0+ ->dpi+eta)=(1.1 +/- 0.3_(stat) +/- 0.7_(syst)) microbarn for the production ofpi+eta via the scalar a0+(980) resonance and sigma(pp -> dpi+eta) = (3.5 +/-0.3_(stat) +/- 1.0_(syst)) microbarn for the non-resonant production. Using thesame model as for the interpretation of recent results from ANKE for thereaction pp -> dK+(bar(K0)), the ratio of the total cross sections is sigma(pp-> d(K+(bar(K0)))_(L=0))/sigma(pp -> da0+ -> dpi+eta) = 0.029 +/- 0.008_(stat)+/- 0.009_(syst), which is in agreement with branching ratios in theliterature.Comment: 5 pages, 8 figures, 1 tabl

a 0 + (980)-resonance production in the reaction pp → dπ + η close to the $$K\bar K$$ threshold