2024/03/02 by Dayoung Lee, Lee, Dayoung, Seung-il Nam +1
Mathematics · Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Nuclear Experiment (nucl-ex) #Nuclear Theory (nucl-th) #Quantum chaos and dynamical systems #Spectral Theory in Mathematical Physics
paper · pdf · doi:10.48550/arxiv.2403.01191
openalex publication_date 2024/03/02 · openalex created_date 2024/03/06 · openalex updated_date 2026/08/01
In our current study, we delve into the peak-like structure observed during the reaction process of K+n→ K0p at approximately √(s)∼2.5 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 MP^*0≈2.5 GeV and ΓP^*0≈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.