Open and Hidden Strangeness Production in Nucleon-Nucleon Collisions

Abstract

We present an overview of the description of K and eta meson productions in nucleon-nucleon collisions within an effective Lagrangian model where meson production proceeds via excitation, propagation and subsequent decay of intermediate baryonic resonant states. The $K$ meson contains a strange quark ($s$) or antiquark ($\bar{s}$) while the $\eta$ meson has hidden strangeness as it contains some component of the $s\bar{s}$ pair. Strange meson production is expected to provide information on the manifestation of quantum chromodynamics in the non-perturbative regime of energies larger than that of the low energy pion physics. We discuss specific examples where proper understanding of the experimental data for these reactions is still lacking.

12 pages, 8 figures, Lecture presented at the 4th DAE-BRNS workshop on Hadron Physics, Aligarh Muslim University, India, Feb. 18-23, 2008, Revised version, some typos corrected

References in corpus (20)

• The light baryon spectrum in a relativistic quark model with instanton-induced quark forces I. The non-strange baryon spectrum and ground-states
• Vector meson production and nucleon resonance analysis in a coupled-channel approach for energies m_N < sqrt(s) < 2 GeV I: pion-induced results and hadronic parameters
• Photoproduction of eta-mesic 3He
• Coupled-channel analysis of the $\omega$-meson production in $\pi N$ and $\gamma N$ reactions for c.m. energies up to 2 GeV
• Pion-nucleon scattering in a meson-exchange model
• Excited hadrons on the lattice: Baryons
• Roper Resonance and S_{11}(1535) from Lattice QCD
• Close-to-threshold Meson Production in Hadronic Interactions
• eta-Nucleon Scattering Length and Effective Range uncertainties
• Dilepton Production in Nucleon-Nucleon Interactions
• Dependence of calculated binding energies and widths of $\eta$-mesic nuclei on treatment of subthreshold $\eta$-nucleon interaction
• The role of ${\Delta }^{++\ast }(1620)$ resonances in $pp\to n{K}^{+}{\Sigma }^{+}$ reaction and its important implications
• Pion and photon couplings of N* resonances from scattering on the proton
• Threshold hyperon production in proton-proton collisions at COSY-11
• The $\eta$-3N problem with separable interactions
• Bounds on the bound η^3He system
• The pp->K+ n Sigma+ reaction near threshold
• Strangeness dynamics in relativistic nucleus-nucleus collision
• Final state interaction in the reaction NN -> eta NN
• Channel coupling effects in $\rho$-meson photoproduction