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Theoretical study of the $\Delta^{++}-\Delta^-$ configuration in the deuteron using antiproton beam
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abstract
We study the manifestation of the $\Delta^{++}-\Delta^-$ component of the deuteron wave function in the exclusive reaction $\bar p d \to \pi^- \pi^- \Delta^{++}$. Due to the large binding energy the internal motion in the $\Delta-\Delta$ system is relativistic. We take this into account within the light-cone (LC) wave function formalism and, indeed, found large differences between calculations based on the LC and non-relativistic (NR) wave functions. We demonstrate, that the consistent LC treatment of the $\Delta-\Delta$ system plays the key role in the separation of the signal and background. Within the LC approach, the characteristic shape of the momentum distribution of the $\Delta-\Delta$ bound system predicted by the meson-exchange model is well visible on the background of usual annihilations at beam momenta between 10 and 15 GeV/c.
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Cited by 1 Pith paper
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Color transparency in $\bar p d \to \pi^- \pi^0 p$ reaction
A model calculation predicts that color transparency strongly modifies the nuclear transparency ratio in \bar p d -> pi- pi0 p and that PANDA can observe this with modest statistics.
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