Mechanism of the close-to-threshold production of the eta meson

Abstract

Measurements of the analysing power for the p(pol)p --> ppeta reaction have been performed in the close-to-threshold energy region at beam momenta of p_{beam}=2.010 and 2.085 GeV/c, corresponding to excess energies of Q=10 and 36 MeV, respectively. The determined analysing power is essentially consistent with zero implying that the eta meson is produced predominantly in the s-wave at both excess energies. The angular dependence of the analysing power, combined with the hitherto determined isospin dependence of the total cross section for the eta meson production in nucleon-nucleon collisions, reveal a statistically significant indication that the excitation of the nucleon to the S_{11}(1535) resonance, the process which intermediates the production of the eta meson, is predominantly due to the exchange of the pi meson between the colliding nucleons.

4 pages, 4 figures, content added

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Cited by in corpus (19)

• Etaprime and Eta Mesons with Connection to Anomalous Glue
• Interaction of eta mesons with nuclei
• The role of $N^{\ast }(1535)$ in ${\eta }^{\prime }$ production
• 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
• Novel detector systems for the Positron Emission Tomography
• Near threshold production of the eta meson via the quasi-free pn --> pn eta reaction
• Coupling Constant for ${\mathbf{N}}^{\ast }(1535)\mathbf{N}\rho$
• Eta meson production in nucleon-nucleon collisions within an effective Lagrangian model
• Invariant mass distributions for the pp to p p eta reaction at Q=10 MeV
• Few-body aspects of the near threshold pseudoscalar meson production
• Study of the eta meson production with the polarised proton beam
• Resonance model study on $K^{+}N\to KN\eta$ near threshold
• Upper limit of the total cross section for the pn --> pn eta' reaction
• Near-threshold $\eta$ production in $pp$ collisions
• Determination of the analysing power for the $\vec{p}p\to pp\eta$ reaction using WASA-at-COSY detector system
• Spin dependence of η meson production in proton-proton collisions close to threshold
• Production and interaction of the eta meson with nucleons and nuclei
• Leading Modes of the 3pi0 production in proton-proton collisions at incident proton momentum 3.35GeV/c
• Dynamics of the near threshold eta meson production in proton-proton interaction