Poszukiwanie stanów związanych na detektorze WASA-at-COSY

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We performed a search for the 4 He - η bound state via exclusive measurement of the excitation function for the dd → 3 Hepπ - reaction, where the outgoing p - π - pair originates from the conversion of the η meson on a neutron inside the 4 He nucleus. The measurements were performed at the Cooler Synchrotron COSY-Juelich with the WASA-at-COSY detection system. The internal deuteron beam of COSY was scattered on a pellet-type deuteron target. The data were taken during a slow acceleration of the beam from 2.185 GeV/c to 2.400 GeV/c crossing the kinematical threshold for the η production in the dd → 4 He η reaction at 2.336 GeV/c. The corresponding excess energy in the 4 He-η system varied from -51.4 MeV to 22 MeV. Events corresponding to decays of the η-mesic 4 He were selected using cuts on the 3 He momentum, p and π - kinetic energies and the relative p - π - angle in the center of mass system. The range of the applied cuts was inferred from simulations of decay of the 4 He - η bound state proceeding via excitation the N ∗ resonance. The integrated luminosity in the experiment was determined using the dd → 3 Hen reaction and the relative normalization of the points of the dd → 3 Hepπ - excitation function was based on the quasi-elastic proton-proton scattering. No signal of the 4 He - η bound state was observed in the excitation function. An upper limit for the cross-section for the bound state formation and decay in the process dd → (4 He - η)bound → 3 Hepπ - , determined for the bound state width of 10, 20 and 30 MeV equals to 28, 32 and 41 nb, respectively. The measured angular and momentum distributions of the reaction products are close to those simulated under the assumption of uniform phase-space distribution.