Higher Partial Waves in p+p->p+p+eta near Threshold

Abstract

Exclusive measurements of the production of eta mesons in the p+p->p+p+eta reaction have been carried out at excess energies of 16 and 37 MeV above threshold. The deviations from phase space are dominated by the proton-proton final state interaction and this influences particularly the energy distribution of the eta meson. However, evidence is also presented at the higher energy for the existence of an anisotropy in the angular distributions of the eta meson and also of the final proton-proton pair, probably to be associated with D-waves in this system interfering with the dominant S-wave term. The sign of the eta angular anisotropy suggests that rho-exchange is important for this reaction.

16 pages, LaTeX2e, 3 EPS Figures, Updated version, Accepted for publication in Phys. Lett. B

References in corpus (2)

• Comparison of eta and eta' production in the pp -> pp eta(eta') reactions near threshold
• Cross section and analyzing power of pol{p}p -> pn pi+ near threshold

Cited by in corpus (22)

• Meson production in nucleon--nucleon collisions close to the threshold
• Close-to-threshold Meson Production in Hadronic Interactions
• Near-Threshold eta Meson Production in Proton-Proton Collisions
• Experimental study of pp eta dynamics in the pp --> ppeta reaction
• Eta Meson Production in NN Collisions
• The production of eta-mesons in nucleon-nucleon collisions near threshold
• Production of eta mesons in nucleon-nucleon collisions
• An analysis of the reaction pp --> ppηnear threshold
• The role of $N^{\ast }(1535)$ in ${\eta }^{\prime }$ production
• Phenomenology of pp->pp eta reaction close to threshold
• Study of exclusive one-pion and one-eta production using hadron and dielectron channels in pp reactions at kinetic beam energies of 1.25 GeV and 2.2 GeV with HADES
• The Reaction $pp\to pp\eta$ and the eta-Nucleon and Nucleon-Nucleon Interactions
• Eta meson production in nucleon-nucleon collisions within an effective Lagrangian model
• Analysing power A_y in the reaction p(pol) p --> p p eta close to threshold
• Final state interaction in the reaction NN -> eta NN
• First close-to-threshold measurement of the analyzing power Ay in the reaction p(pol)p -> pp eta
• Eta and eta' mesons production at COSY-11
• Near-threshold $\eta$ production in $pp$ collisions
• Di-electrons from $\eta$ meson Dalitz decay in proton-proton collisions
• The detailed mechanism of the eta production in pp scattering up to the Tlab = 4.5 GeV
• On the close to threshold meson production in neutron-neutron collisions
• Production of Eta Mesons in Proton-Proton Collisions Close to Threshold