New results on the pd → 3 He η production near threshold


Measurements on the η meson production in proton-deuteron collisions have been performed using the COSY-11 facility at COSY (Jülich). Here we present preliminary results on total and differential cross sections for the pd→He η reaction at five excess energies between Q = 5.1 and Q = 40.6 MeV. The obtained angular distributions for the emitted η mesons in the center of mass system expose a transition from an almost isotropic emission to a highly anisotropic distribution. The extracted total cross sections support a strong η-He final state interaction and will be compared with model predictions.

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@inproceedings{Khoukaz2004NewRO, title={New results on the pd → 3 He η production near threshold}, author={A . Khoukaz and Nina Lang and T . LISTER and Ryoko Santo and Siegfried Steltenkamp and R . Czyżykiewicz and Myśliwiec Janusz and Lucjan Jarczyk and B . Kamys and Przemyslaw Moskal and C . PISKOR and Joanna Przerwa and Jerzy Smyrski and Daniel Grzonka and Krzysztof Kilian and Walter Oelert and Th . Sefzick and M . WOLKE P . WINTER and P. Wuestner and Tomas Rozek}, year={2004} }