Journal Article

PreJuSER-54722

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Phenomenology of the Lambda/Sigma0 production ratio in p p collisions

Sibirtsev, A.FZJ* ; Haidenbauer, J.FZJ* ; Hammer, H. W.FZJ* ; Meissner, U. G.FZJ*

2006
Springer Berlin

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Please use a persistent id in citations: http://hdl.handle.net/2128/10561  doi:10.1140/epja/i2006-10097-5

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 for the reaction pp --> K+Sigma(0) p, 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.

Keyword(s): p p: exclusive reaction ; Lambda: hadroproduction ; Sigma0: hadroproduction ; yield: ratio ; K+: associated production ; p Lambda: final-state interaction ; helicity: angular dependence ; angular distribution: asymmetry ; numerical calculations ; interpretation of experiments: Juelich COSY PS ; p p --> Lambda p K+ ; p p --> Sigma0 p K+

Note: Record converted from VDB: 12.11.2012

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Contributing Institute(s):

1. Institut 3 (Theoretische Kernphysik) (IKP-TH)
2. Jülich-Aachen Research Alliance - Simulation Sciences (JARA-SIM)

Research Program(s):

1. Physik der Hadronen und Kerne (P53)

Appears in the scientific report 2006

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Database coverage:

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