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arXiv · 2207.13575

Resonant behavior of the $pp \to \{pp\}_s \pi^0$ reaction at the energy $\sqrt{s}$ = 2.65 GeV

Dmitry Tsirkov·Bota Baimurzinova·Vladimir I. Komarov·Anatoly V. Kulikov·Ainur Kunsafina·Vladimir S. Kurbatov·Zhanibek Kurmanalyiev·Yury N. Uzikov
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Abstract

We report on measurements of the differential cross section $d\sigma/d\Omega$ in the energy region of $\sqrt{s}$ = 2.5-2.9 GeV of the reaction $pp \to \{pp\}_s \pi^0$ where $\{pp\}_s$ is a $^1\!S_0$ proton pair. The experiment has been performed with the ANKE spectrometer at COSY-J\"ulich. The data reveal a peak in the energy dependence of the forward $\{pp\}_s$ differential cross section at the energy $\sqrt{s}$ = 2.65 GeV with the width $\Gamma$ = 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 $\Delta(1232)$ and $N^*(1440)$.

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Dmitry Tsirkov, Bota Baimurzinova, Vladimir I. Komarov, Anatoly V. Kulikov, Ainur Kunsafina, Vladimir S. Kurbatov, Zhanibek Kurmanalyiev, Yury N. Uzikov. 2022-07-27. Resonant behavior of the $pp \to \{pp\}_s \pi^0$ reaction at the energy $\sqrt{s}$ = 2.65 GeV. https://doi.org/10.1103/physrevc.107.015202

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