The pp->K+ n Sigma+ reaction near threshold

Abstract

Inclusive K+ production in proton-proton collisions has been measured at a beam energy of 2.16 GeV using the COSY-ANKE magnetic spectrometer. The resulting spectrum, as well as those corresponding to K+ p and K+ pi+ correlated pairs, can all be well described using consistent values of the total cross sections for the pp->K+ p Lambda, pp->K+ p Sigma0, and pp->K+ n Sigma+ reactions. While the resulting values for Lambda and Sigma0 production are in good agreement with world data, our value for the total Sigma+ production cross section, sigma(pp->K+ n Sigma+) = 2.5+/-0.6(stat)+/-0.4(syst) mkb at an excess energy of epsilon=129 MeV, could only be reconciled with other recently published data if there were a highly unusual near--threshold behaviour.

9 pages, 5 figures

References in corpus (6)

• Evidence for a narrow resonance at 1530 MeV/c2 in the K0 p - system of the reaction pp --> Sigma+ K0 p from the COSY-TOF experiment
• Resonance model study of kaon production in baryon baryon reactions for heavy ion collisions
• The role of ${\Delta }^{++\ast }(1620)$ resonances in $pp\to n{K}^{+}{\Sigma }^{+}$ reaction and its important implications
• Threshold hyperon production in proton-proton collisions at COSY-11
• Study of omega-meson production in pp collisions at ANKE
• The pp -> K^+Sigma^+n cross section from missing mass spectra

Cited by in corpus (18)

• Production of Lambda and Sigma^0 hyperons in proton-proton collisions
• The energy dependence of the pp->K+ n Sigma+ reaction close to threshold
• Strangeness production via resonances in heavy-ion collisions at SIS energies
• Cross section of the $pp\to K^{+}{\Sigma }^{+}n$ reaction close to threshold
• The pK0Σ+ final state in proton-proton collisions
• On the structure in the $\Lambda N$ cross section at the $\Sigma N$ threshold
• Strangeness Production Process $pp\to n{K}^{+}{\Sigma }^{+}$ within Resonance Model
• The measurement of the pp->K+ n Sigma+ reaction near threshold
• Medium effects in $\Lambda K^{+}$ pair production by 2.83 GeV protons on nuclei
• Upper limits for a narrow resonance in the reaction p + p -> K^+ + (Lambda p)
• Coupled channels calculation of a pion-Lambda-nucleon quasibound state
• Complete Strangeness Measurements in Heavy-Ion Collisions
• Reexamination of the role of the ${\Delta }^{\ast }$ resonances in the $pp\to n{K}^{+}{\Sigma }^{+}$ reaction
• Strangeness Production in Hadron Reactions
• Strangeness Production at COSY
• Meson Production at COSY-TOF and COSY-ANKE
• Open and Hidden Strangeness Production in Nucleon-Nucleon Collisions
• Strangeness production from pp collisions