Phenomenology of the Lambda/Sigma^0 production ratio in pp collisions

Abstract

We show that the recently measured asymmetry in helicity-angle spectra of the Lambda-hyperons produced in the reaction pp -> K^+Lambda p reaction and the energy dependence of the total pp -> K^+Lambda p cross section can be explained consistently by the same Lambda p final-state interaction. Assuming that there is no final-state interaction in the Sigma^0 p channel, as suggested by the available data, we can also reproduce the energy dependence of the Lambda/Sigma^0 production ratio and, in particular, the rather large ratio observed near the reaction thresholds. The nominal ratio of the Lambda and Sigma^0 production amplitudes squared, i.e. when disregarding the final-state interaction, turns out to be about 3, which is in line with hyperon production data from proton and nuclear targets available at high energies.

arXiv comment5 pages, 3 figures

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Cited by in corpus (13)

• Lineshape of the Lambda(1405) Hyperon Measured Through its Sigma0 pion0 Decay
• On the nature of the lowest $1/2^{-}$ baryon nonet and decuplet
• Five-quark components in baryons
• The role of ${\Delta }^{++\ast }(1620)$ resonances in $pp\to n{K}^{+}{\Sigma }^{+}$ reaction and its important implications
• Production of Lambda and Sigma^0 hyperons in proton-proton collisions
• Role of the possible ${\Sigma }^{\ast }({\frac{1}{2}}^{-})$ state in the $\Lambda p\to \Lambda p{\pi }^0$ reaction
• Cross section of the $pp\to K^{+}{\Sigma }^{+}n$ reaction close to threshold
• Eta meson production in nucleon-nucleon collisions within an effective Lagrangian model
• The pK0Σ+ final state in proton-proton collisions
• The pp -> K^+Sigma^+n cross section from missing mass spectra
• Complementary studies on $N^{\ast }$ from $e^{+}{e}^{-}$, $pp$ and $p\bar{p}$ collisions
• The pp->p Lambda K+ and pp->p Sigma0 K+ reactions with chiral dynamics
• Reexamination of the role of the ${\Delta }^{\ast }$ resonances in the $pp\to n{K}^{+}{\Sigma }^{+}$ reaction