Delta Delta Excitation in Proton-Proton Induced pi0pi0 Production

Details Delta Delta Excitation in Proton-Proton Induced pi0pi0 Production Delta Delta Excitation in Proton-Proton Induced pi0pi0 Production

2010-07-02

arxiv.org/abs/1007.0405v1

Phys.Lett.B695:115-123,2011

Physics

Nuclear Physics

Nuclear Experiment

Scientific paper

10.1016/j.physletb.2010.11.030

Exclusive measurements of the $pp \to pp\pi^0\pi^0$ reaction have been performed at CELSIUS/WASA at energies from threshold up to $T_p$ = 1.3 GeV. Total and differential cross sections have been obtained. Here we concentrate on energies $T_p \ge$ 1 GeV, where the $\Delta\Delta$ excitation becomes the leading process. No evidence is found for a significant ABC effect beyond that given by the conventional $t$-channel $\Delta\Delta$ excitation. This holds also for the double-pionic fusion to the quasibound $^2$He. The data are compared to model predictions, which are based on both pion and $\rho$ exchange. Total and differential cross sections are at variance with these predictions and call for a profound modification of the $\rho$-exchange. A phenomenological modification allowing only a small $\rho$ exchange contribution leads to a quantitative description of the data.

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