Combined analysis of the ${\pi }^{-}p\to K^0\Lambda$, $\eta n$ reactions in a chiral quark model

Abstract

A combined analysis of the reactions ${\pi }^{-}p\to K^0\Lambda$ and $\eta n$ is carried out with a chiral quark model. The data in the center-of-mass (c.m.) energy range from threshold up to $W\simeq 1.8$ GeV are reasonably described. For ${\pi }^{-}p\to K^0\Lambda$, it is found that $N(1535)S_{11}$ and $N(1650)S_{11}$ paly crucial roles near threshold. The $N(1650)S_{11}$ resonance contributes to the reaction through configuration mixing with $N(1535)S_{11}$. The constructive interference between $N(1535)S_{11}$ and $N(1650)S_{11}$ is responsible for the peak structure around threshold in the total cross section. The $n$-pole, $u$- and $t$-channel backgrounds provide significant contributions to the reaction as well. While, for the ${\pi }^{-}p\to \eta n$ process, the "first peak" in the total cross section is dominant by $N(1535)S_{11}$, which has a sizeable destructive interference with $N(1650)S_{11}$. Around $P_{\pi }\simeq$ 1.0 GeV/c ($W\simeq 1.7$ GeV), there seems to be a small bump structure in the total cross section, which might be explained by the interference between the $u$-channel and $N(1650)S_{11}$. The $N(1520)D_{13}$ resonance notably affects the angle distributions of the cross sections, although less effects are seen in the total cross section. The role of $P$-wave state $N(1720)P_{13}$ should be further confirmed by future experiments. If $N(1720)P_{13}$ has a narrow width of $\Gamma \simeq 120$ MeV as found in our previous work by a study of the ${\pi }^0$ photoproduction processes, obvious evidence should be seen in the ${\pi }^{-}p\to K^0\Lambda$ and $\eta n$ processes as well.

12 pages, 8 figures

References in corpus (8)

• eta-photoproduction in the resonance energy region
• Roy-Steiner equations for pion-nucleon scattering
• Coupled-channels study of the ${\pi }^{-}p\to \eta n$ process
• Study of π^{-}p \to ηn at low energies in a chiral constituent quark model
• Study of $\eta$ photoproduction on the proton in a chiral constituent quark approach via one-gluon-exchange model
• Role of the $N^{\ast }$(1535) in the $J/\psi \to \bar{p}\eta p$ and $J/\psi \to \bar{p}{K}^{+}\Lambda$ reactions
• Strangeness in the proton and N*(1535)
• Quarks, diquarks and QCD mixing in the $N^{\ast }$ resonance spectrum

Cited by in corpus (4)

• Understanding the newly observed ${\Omega }_c$ states through their decays
• Strong and radiative decays of the doubly charmed baryons
• $N^{\ast }$ resonances from $K\Lambda$ amplitudes in sliced bins in energy
• Quark model study of the $\pi N\to \pi N$ reactions up to the $N(1440)$ resonance region