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In June 2008 we performed a search for the 4He-eta bound state by measuringthe excitation function of the dd to 3He p pi- reaction near the eta productionthreshold using the WASA-at-COSY detector. During the experimental run themomentum of the deuteron beam was varied continuously within each accelerationcycle from 2.185 GeV/c to 2.400 GeV/c, crossing the kinematic threshold for theeta production in the dd to 4He eta reaction at 2.336 GeV/c. The preliminaryexcitation function indicates no structure in the angular range close to the180 degree where the signal is expected. The preliminary estimation of theupper limit for the eta-mesic production via the dd to (eta 4He)b.s. to 3He ppi- reaction is equal to about 20 nb on a one sigma level. A two-weekmeasurement with WASA-at-COSY for the dd 3He p pi- channel is scheduled forNovember 2010. After two weeks of measurement with a luminosity of 4 * 10^(30)cm^(-2) s^(-1), we expect a statistical sensitivity of a few nb sigma.

Search for eta-mesic 4He with WASA-at-COSY