Eta and eta-prime meson production in the reaction pn -> dM near
  threshold

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Abstract

The two-step model with pi-, rho- and omega- exchanges taken into account is applied to investigate the reactions pn -> d eta and pn -> d eta-prime. The existing experimental data on the reaction pn -> d eta are analysed and predictions for the cross section of the reaction pn -> d eta-prime are presented. It is found that pi- as well as rho exchange yield significant contributions in both reactions. The effect of the final state interaction is also studied.

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\(\pi NN\) and Pseudoscalar Form Factors from Lattice QCD

Terrence Draper, S. J. Dong, K. F. Liu … (1994)

The \(\pi NN\) form factor \(g_{\pi NN}(q^2)\) is obtained from a quenched lattice QCD calculation of the pseudoscalar form factor \(g_P(q^2)\) of the proton with pion pole dominance. We find that \(g_{\pi NN}(q^2)\) fitted with the monopole form agrees well with the Goldberger-Treiman relation and is much preferred over the dipole form. The monopole mass is determined to be \(0.75 \pm 0.14 {\rm GeV}\) which shows that \(g_{\pi NN}(q^2)\) is rather soft. The extrapolated \(\pi N\) coupling constant \(g_{\pi NN} = 12.7 \pm 2.4\) is quite consistent with the phenomenological values. We also compare \(g_{\pi NN}(q^2)\) with the axial form factor \(g_A(q^2)\) to check the pion dominance in the induced pseudoscalar form factor \(h_A(q^2)\) vis \`{a} vis chiral Ward identity.

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Role ofπ0η′mixing in nuclear charge asymmetry

Sidney A. Coon, Michael Scadron (1982)

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Meson Masses in Nuclear Matter

B. L. Ioffe, V. Eletsky (1996)

Mass shifts \(\Delta m\) of particles in nuclear matter relative to their vacuum values are considered. A general formula relating \(\Delta m(E)\) (\(E\) is the particle energy) to the real part of the forward particle-nucleon scattering amplitude \({\rm Re} f(E)\) is presented and its applicability domain is formulated. The \(\rho\)-meson mass shift in nuclear matter is calculated at \(2\la E_{\rho}\la 7\) GeV for transversally and longitudinally polarized \(\rho\)-mesons with the results: \(\Delta m_{\rho}^T \sim 50\) MeV and \(\Delta m_{\rho}^L \sim 10\) MeV at normal nuclear density.