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In our current study, we delve into the peak-like structure observed during the reaction process of K^+n K^0p at approximately s2. 5 GeV. Our focus centers on exploring the potential S=+1 resonance P^+*₀ P^*₀ as an excited state within the extended vector-meson and baryon (VB) antidecuplet. To achieve this aim, we employ the effective Lagrangian method in conjunction with the (u, t) -channel Regge approach, operating within the tree-level Born approximation. We thoroughly examine various spin-parity quantum numbers for the resonance, resulting in a compelling description of the data, where M^*䃐2. 5 GeV and ^*䃐100 MeV. Furthermore, we propose an experimental technique to amplify the signal-to-noise ratio (S/N) for accurately measuring the resonance. Notably, our findings reveal that background interference diminishes significantly within the K^* forward-scattering region in the center-of-mass frame when the K^* is perpendicularly polarized to the reaction plane. Additionally, we explore the recoil-proton spin asymmetry to definitively determine the spin and parity of the resonance. This study stands to serve as a valuable reference for designing experimental setups aimed at investigating and comprehending exotic phenomena in QCD. Specifically, our insights will inform future J-PARC experiments, particularly those employing higher kaon beam energies.
Lee et al. (Sat,) studied this question.
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