On possible existence of the dibaryon resonance $d^*_1$ and its role in the $npγ$ and $pdγ$ processes below the pion threshold

Details On possible existence of the dibaryon resonance $d^*_1$ and its role in the $npγ$ and $pdγ$ processes below the pion threshold On possible existence of the dibaryon resonance $d^*_1$ and its role in the $npγ$ and $pdγ$ processes below the pion threshold

2002-11-28

arxiv.org/abs/nucl-ex/0211034v3

Nucl.Phys. A721 (2003) 625-628

Physics

Nuclear Physics

Nuclear Experiment

4 pages, LaTex, 4 eps-figures, Talk presented at the XVI International Conference on Particle and Nuclei (PANIC02), Osaka, Jap

Scientific paper

10.1016/S0375-9474(03)01138-2

We give reasons for the existence of the NN decoupled dibaryon resonance $d^*_1$(1956). Strong evidence for its presence has first been found in the energy spectrum of coincident photons emitted at $\pm 90^0$ from the $pp \to \gamma\gamma X$ process at 216 MeV measured by the DIB2$\gamma$ collaboration at JINR. As further experimental indications of the $d^*_1$(1956) existence we present those found in the available photon energy spectra of $np\gamma$, $pd\gamma$, and $pA\gamma$ reactions below the pion threshold. It is noted that serious discrepancies between the $np\gamma$ and $pd\gamma$ experimental cross sections and theoretical calculations can reasonably be explained by the fact that latter did not take into account the $d^*_1$ effect.

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