Near threshold Lambda and Sigma production in pp collisions

Abstract

A model calculation for the reactions $pp\to p\Lambda K^{+}$ and $pp\to N\Sigma K$ near their thresholds is presented. It is argued that the experimentally observed strong suppression of ${\Sigma }^0$ production compared to $\Lambda$ production at the same excess energy could be due to a destructive interference between the $\pi$ and $K$ exchange contributions in the reaction $pp\to p{\Sigma }^0{K}^{+}$. Predictions for $pp\to p{\Sigma }^{+}{K}^0$ and $pp\to n{\Sigma }^{+}{K}^{+}$ are given.

3 pages, 1 figure, uses espcrc1.sty, contribution presented at the 16th International Conference on Few-Body Problems in Physics, Taipei, Taiwan, 6-10 March 2000

Cited by in corpus (13)

• Close-to-threshold Meson Production in Hadronic Interactions
• The role of ${\Delta }^{++\ast }(1620)$ resonances in $pp\to n{K}^{+}{\Sigma }^{+}$ reaction and its important implications
• Lambda hyperon production and polarization in collisions of p(3.5 GeV) + Nb
• Threshold hyperon production in proton-proton collisions at COSY-11
• Sigma photoproduction in the resonance region
• Analysis of the Lambda p Final State Interaction in the Reaction p+p->K^+(Lambda p)
• Complementary studies on $N^{\ast }$ from $e^{+}{e}^{-}$, $pp$ and $p\bar{p}$ collisions
• Resonance model study on $K^{+}N\to KN\eta$ near threshold
• Reexamination of the role of the ${\Delta }^{\ast }$ resonances in the $pp\to n{K}^{+}{\Sigma }^{+}$ reaction
• Reeconstructing Sigma0 decays in STAR
• Threshold Hyperon Production at COSY-11
• Strangeness production from pp collisions
• Near threshold production of the pseudoscalar mesons at the COSY-11 facility