The tensor-pomeron model predicts 0.3 to 0.7 microbarn cross sections for central eta-prime production at the LHC, and shows that scalar-pomeron models forbid eta, eta-prime, and f1 production entirely.
A study of pseudoscalar states produced centrally in pp interactions at 450 GeV/c
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abstract
A study has been made of pseudoscalar mesons produced centrally in pp interactions. The results show that the eta and etaprime appear to have a similar production mechanism which differs from that of the pi0. The production properties of the eta and etaprime are not consistent with what is expected from double Pomeron exchange. In addition the production mechanism for the eta and etaprime is such that the production cross section are greatest when the azimuthal angle between the pT vectors of the two protons is 90 degrees.
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Central exclusive production of $\eta$ and $\eta'$ mesons in diffractive proton-proton collisions at the LHC within the tensor-pomeron approach
The tensor-pomeron model predicts 0.3 to 0.7 microbarn cross sections for central eta-prime production at the LHC, and shows that scalar-pomeron models forbid eta, eta-prime, and f1 production entirely.