Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2008-12-26
Physics
Nuclear Physics
Nuclear Theory
6 pages, 4 figures, Talk given at XIX International Baldin Seminar on High Enegy Physics Problems (Dubna, 29 September-4 Octob
Scientific paper
COSY-ANKE data on the cross section of the reactions $pp\to \{pp\}_s\pi^0$ and $pp\to \{pp\}_s\gamma$, where $\{pp\}_s$ is the proton pair in the $^1S_0$ state at small excitation energy $E_{pp}<3$ MeV, are analyzed at beam energies $0.5 - 2.0$ GeV within the one-pion exchange model. The model includes the subprocesses $\pi^0 p\to \pi^0 p$ and $\pi^0 p\to \gamma p$ for the pion- and photo-production, respectively, and accounts for the final state pp-interaction. A broad maximum in the energy dependence of the $\pi^0$ production at $\sim 0.5 -0.6$ GeV and fast increase of the $\gamma$-production cross section at $0.3 - 0.55$ GeV observed in the data are explained by the $\Delta$-isobar contribution. An analogy with the dynamics of the deuteron breakup reaction $pd\to \{pp\}_sn$ in the $\Delta$-region is outlined.
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