Abstract.
Using the symmetry properties of the strong interaction, such as the Pauli principle, the P-invariance, the conservation of the total angular momentum and isotopic invariance, we establish the spin structure of the threshold matrix elements for the processes \(p + p\to \Theta^ + + \Sigma^ + \) and \(n + p\to \Theta^ + + \Lambda^0\), in the near-threshold region, in a model-independent way, which applies to any spin and parity of the \(\Theta^ + \)-hyperon. We predict the double-spin observables for these processes, such as the dependence of the differential cross-section on the polarizations of the colliding nucleons, and the coefficients of polarization transfer from a nucleon beam or target to the produced \(\Sigma^ + \)- or \(\Lambda^0\)-hyperon. We prove that these observables are sensitive to the P-parity of the \(\Theta^ + \)-baryon, for any value of its spin. As an example of dynamical considerations, we analyzed these reactions in the framework of K-meson exchange.
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Communicated by V.V. Anisovich
Received: 6 April 2004, Published online: 6 October 2004
PACS:
13.88. + e Polarization in interactions and scattering - 13.75.-n Hadron-induced low- and intermediate-energy reactions and scattering (energy \(\leq\) 10 GeV) - 14.20.Jn Hyperons
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Rekalo, M.P., Tomasi-Gustafsson, E. Polarization observables in the processes \(p + p\to \Theta^ + + \Sigma^ + \) and \(n + p\to \Theta^ + + \Lambda^0\), in the threshold region, for any spin and parity of the \(\Theta^ + \)-hyperon. Eur. Phys. J. A 22, 119–124 (2004). https://doi.org/10.1140/epja/i2004-10026-8
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DOI: https://doi.org/10.1140/epja/i2004-10026-8