Production of the S01 diproton in the pp→ppπ0

Evidence for excitation of two resonance states in the isovector two-baryon system with a mass of 2.2 GeV/c2

“…In case of a proper assumption both t values should coincide. This allowed clean separation of pp pairs from pπ + , dπ + pairs and the accidental coincidence background of 1% [29].…”

“…A more detailed description of the setup, measurements, and data processing can be found in Refs. [29][30][31][32][33][34]. The only essential change in the data processing was more careful tuning of the geometry of the setup and introduction of a kinematical fit into this procedure.…”

“…In spite of these advantages of reaction (2), its experimental study was incomparably less extensive than of (1) due to a smaller cross section and necessity of high momentum resolution for the 1 S 0 diproton identification. The proton-beam energy of T p = 425 MeV in the WASA (Wide-Angle Shower Apparatus) experiment [28] was the highest for reaction (2) until the ANKE measurements from 353 to 1970 MeV were published [29][30][31]. The whole (1232) excitation region has been scarcely explored yet.…”

Deuteron breakuppd→{pp}snwith forward emission of a fastDymov1, Komarov2, Macharashvili3 et al. 2010Phys. Rev. CSelf Cite140110View full textAdd to dashboardCite

“…Like in the present study, the -isobar contributions were expected to be significantly suppressed compared to the corresponding reactions with a final deuteron due to general symmetry properties. But the measurements [88][89][90] show pronounced enhancements of the cross sections in the region. Presumably, these results also indicate that high-momentum components in the NN wave functions are rather weak [91].…”

“…Very similar arguments were applied to motivate investigations of other reactions with the formation of a diproton in the final state [88][89][90]. These are pp → {pp} s π 0 and pp → {pp} s γ , investigated at several hundred MeV in kinematics of pp → dπ + and pn → dγ , respectively.…”