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ISSN - 0217751X, International Journal of Modern Physics A, 2011, vol. 26, p. 702-704

The pp → ppπ0π0 reaction and its limiting case, fusion to quasi-bound 2He, in search of the ABC effect

Skorodko T., Bashkanov M., Bogoslowsky D., Calén H., Clement H., Doroshkevich E., Ekström C., Fransson K., Gustafsson L., Höistad B., Ivanov G., Jacewicz M., Jiganov E., Johansson T., Keleta S., Khakimova O., Koch I., Kren F., Kullander S., Kupść A., Kuznetsov A., Marciniewski P., Meier R., Morosov B., Pauly C., Petterson H., Petukhov Y., Povtorejko A., Pricking A., Ruber R. J M Y, Schönning K., Scobel W., Shwartz B., Sopov V., Stepaniak J., Thörngren-Engblom P., Tikhomirov V., Turwiecki A., Wagner G. J., Wolke M., Yamamoto A., Zabierowskf J., Złomanćzuk J.

The π0π0 production in pp-collisions has been investigated in exclusive and kinematically complete measurements from threshold up to Tp = 1.4 GeV. For incident energies Tp > 1 GeV, i.e. in the region beyond the Roper excitation, the ΔΔ excitation process takes over. The data are well explained by the t-channel ΔΔ process dominated by pion exchange. There is no low-mass enhancement (ABC effect) in the π0π0-invariant mass distribution beyond that given by the conventional t-channel ΔΔ process. This is also true for the limiting case, where the protons are in the quasi-bound 2He state. © 2011 World Scientific Publishing Company.