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New data on both total and differential cross sections of the production of$\eta$ mesons in proton-deuteron fusion to ${}^3\text{He}\,\eta$ in the excessenergy region $13.6\;\text{MeV}\leq Q_\eta \leq 80.9\;\text{MeV}$ arepresented. These data have been obtained with the WASA-at-COSY detector setuplocated at the Forschungszentrum J\"ulich, using a proton beam at 15 differentbeam momenta between $p_p = 1.60\;\text{GeV}/c$ and $p_p = 1.74\;\text{GeV}/c$.While significant structure of the total cross section is observed in theenergy region $20\;\text{MeV}\lesssim Q_\eta \lesssim 60\;\text{MeV}$, apreviously reported sharp variation around $Q_\eta\approx 50\;\text{MeV}$cannot be confirmed. Angular distributions show the typical forward-peakingthat was reported elsewhere. For the first time, it is possible to study thedevelopment of these angular distributions with rising excess energy over alarge interval.

physics letters b

Total and differential cross sections of $\eta$-production in  proton-deuteron fusion for excess energies between $Q_\eta=13\;\text{MeV}$  and $Q_\eta=81\;\text{MeV}$