Decay properties of $N^{*}(1895)$

The nature of nucleon resonances is still being debated, while much experimental data are accumulated. In this work, we focus on the negative parity resonance $N^{*}(1895)$ which is located in the scattering region of various meson-baryon coupled channels, and such dynamics can be crucial in understanding its properties. To test the relevance of such hadron dynamics, we investigate the decay properties of $N^{*}(1895)$ in detail. We examine how a two pole nature of $N^{*}(1895)$ is compatible with its observed decay properties. Moreover, we find that the resonance decays into final states involving $\mathrm{\Lambda }(1405)$ and $\mathrm{\Sigma }(1400)$, where the latter is not yet observed experimentally. Such decay processes can be useful to study the properties of the aforementioned hyperon resonances.

Figure 1

Diagrams contributing to $N^{*+}\to K^{+}{H}^{*}$, where $H^{*}$ refers to $\mathrm{\Lambda }(1405)$ or ${\mathrm{\Sigma }}^0(1400)$.

Figure 2

Four-momentum labels for the particles involved in the $N^{*}\to K^{+}{\mathrm{\Sigma }}^{*}$ process.

Figure 3

Modulus squared amplitudes related to $N_1^{*}$ (dotted line), $N_2^{*}$ (dashed line) and their interference (solid line), which produces a unique peak, in this case, around 1900 MeV.

Figure 4

Contribution of $N^{*}(1895)$ in $H^{*0}$ photoproduction, where $H^{*}$ denotes $\mathrm{\Lambda }(1405)$ or $\mathrm{\Sigma }(1400)$.

Figure 5

Real (solid lines) and imaginary (dashed lines) parts of the amplitudes for the processes $N_{1,2}^{*+}\to K^{+}{\mathrm{\Lambda }}_1$ (top panel, left side), $N_{1,2}^{*+}\to K^{+}{\mathrm{\Lambda }}_2$ (top panel, right side) and $N_{1,2}^{*+}\to K^{+}{\mathrm{\Sigma }}^0(1400)$ (lower panel). The red (dark gray) and yellow (light gray) color lines represent the amplitudes related to $N_1^{*}$ and $N_2^{*}$, respectively, in the initial state.