Recently differential cross section and vector analyzing power $A_y$ of the one pion production reaction $pp \rightarrow pp_{s} \pi^{0}$, where $pp_{s}$ denotes the pp-pair in the $^1S_0$ state, were measured by ANKE@COSY [1] at proton beam energies 0.3-0.8 GeV. A resonance behavior of the differential cross section was observed at 0.5-0.8 GeV. This behavior and measured $A_y$ were described using fit by two isovector Breit-Wigner resonances in the $^3P_0$ and $^3P_2$ states. The contribution of the $\Delta$-isobar mechanism in this reaction was studied in [2]. The parameters for the coupling constants and vertex form factors which were used to explain the COSY data on the reaction $dp \rightarrow pp_{s} \pi N$ [3] are applied here. The calculated energy dependence of the differential cross section of the reaction $pp \rightarrow {pp}_{s} \pi$ at zero angle of the pion is in qualitative agreement in shape with the data at energy 0.35-0.8 MeV. It is shown that main contribution is made by three partial waves of the pp-channel: $^3P_0$, $^3P_2$, $^3F_2$. The model explains the position of the peak observed at 0.6 GeV and zero diproton scattering angle but underestimates its absolute value. Furthermore, the $\Delta$-mechanism fails to describe the analyzing power $A_y$.

Resonance structure was observed by ANKE@COSY also in the behavior of the differential cross section of the two-pion production reaction $pd\to pd X$ at beam energies 0.8-2.0 GeV with high transferred momentum to the deuteron at small scattering angles of the final proton and deuteron (see a talk by D.Tsirkov at this conference). The $d\pi\pi$ invariant masses of the observed peaks are close to 2.380 GeV that is the mass of isoscalar two-baryon resonance $D_{IJ}=D_{03}$ observed by WASA@COSY in the reaction $pn\to d\pi^0\pi^0$ [4], while the width is by a factor of $\sim 1.5$ larger than for the $D_{03}$. One possible mechanism of the reaction $pn\to d\pi^0\pi^0$ suggested in the paper [5] involves two dibaryon resonances, $D_{03}$ and $D_{12}$. We modify this model by inclusion of the $\sigma$-meson exchange between the proton and deuteron and apply it to the process $pd\to pd X$.

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[1] V.I.Komarov et al. (ANKE@COSY Collab.) Phys. Rev. C 93, 065206 (2016).

[2] Yu.N. Uzikov, Izv. RAN. Ser. Fiz. v.81, 815 (2017) [Bull. Rus. Ac. Sc. 81, 739 (2017)].

[3] Yu.N. Uzikov, J. Haidenbauer, C. Wilkin, PoS (Baldin ISHEPP XXII) 093 (arXiv:1502.04675 [nucl-th]).

[4] P. Adlarson et al. (WASA@COSY Collab.), Phys. Rev. Lett. 106, 242302 (2011).

[5] M.N. Platonova, V.I. Kukulin, Phys. Rev. C 87, 025202 (2013).