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First results of the CELSIUS/WASA experiment

Koch I., Bargholtz C., Bogoslawsky D., Bondar A., Calén H., Cappellaro F., Clement H., Comfort J., Demirörs L., Dorochkevitch E., Ekström C., Fransson K., Fridén C. J., Chernyshev B., Gerén L., Gornov M., Grebenev V., Greiff J., Gurov Y., Gustafsson L., Höistad B., Ivanov G., Jacewicz M., Jiganov E., Johansson A., Johansson T., Keleta S., Kilian K., Kimura N., Kullander S., Kupść A., Kurdadze L., Kuzmin A., Kuznetsov A., Lindberg K., Marciniewski P., Martemyanov B., Meier R., Morosov B., Nawrot A., Nefkens B. M K, Oelert W., Oreshkin S., Pauly C., Pawlowski Z., Petukhov Y., Povtorejko A., Pätzold J., Reistad D., Ruber R. J M Y, Sandukovsky V., Scobel W., Sefzick T., Shafigullin R., Shepkin M., Sidorov V., Shwartz B., Skorodko T., Sopov V., Starostin A., Stepaniak J., Sukhanov A., Tchernychev V., Tegner P. E., Thörngren Engblom P., Tikhomirov V., Turowiecki A., Wagner G., Wiedner U., Wilhelmsen K., Wilhelmi Z., Yamamoto A., Yamaoka H., Zabierowski J., Zlomańczuk J.

The CELSIUS/WASA experiment is now finishing its commissioning phase and has started regular data talcing in autumn 2001. Results from a first analysis of data samples from an experimental run at a beam energy of Tp = 1360MeV in September 2001 are presented. The results show the ability to tag π0 and η production events. For 2π0 production a large data sample exists. The 2π0 and 3π0 production processes will be important sources of background for the η decays. They have until now been poorly measured, if at all. at this energy. The decay η → γγ will be used for normalization of all other η decays and the η → 3π0 decay will test the light quark mass ratio predicted by Chiral Perturbation Theory.