Exotic properties of N^*(1895) and its impact on photoproduction of light hyperons

Abstract

In this work, we outline the findings of our recent study of the properties of $N^{\ast }(1895)$ and its consequential impacts on the cross sections of the photoproduction of $\Lambda (1405)$. Further, we discuss the possibility of the existence of an isovector state, with the mass similar to $\Lambda (1405)$, which we refer to as $\Sigma (1400)$. With the idea of motivating experimental investigations of $\Sigma (1400)$, we have studied its photoproduction process and determined the respective cross sections and polarization observables. We have studied also the coupling of $N^{\ast }(1895)$ to $K\Sigma (1400)$ and found that it gives an important contribution to the cross sections near the threshold. In the process, we have determined the branching ratios of the decay of $N^{\ast }(1895)$, to the final states involving $\Lambda (1405)$ and $\Sigma (1400)$, to be in the range of 6-7 MeV. Our findings can motivate consideration of alternative processes in partial wave analyses of experimental data, when studying the properties of $N^{\ast }(1895)$.

Proceedings for the 4th Jagiellonian Symposium on Advances in Particle Physics and Medicine, organised by the Jagiellonian University in Krakow, with the address and acknowledgments updated for one of the authors

References in corpus (8)

• Lattice QCD Evidence that the Lambda(1405) Resonance is an Antikaon-Nucleon Molecule
• Measurement of the Sigma pi photoproduction line shapes near the Lambda(1405)
• New insights into antikaon-nucleon scattering and the structure of the Lambda(1405)
• Vector meson-Baryon dynamics and generation of resonances
• Evidence for a new ${\Sigma }^{\ast }$ resonance with $J^P=1/2^{-}$ in the old data of $K^{-}p\to \Lambda {\pi }^{+}{\pi }^{-}$ reaction
• Origin of the second peak in the cross section of the $K^{+}\Lambda$ photoproduction
• Role of the possible ${\Sigma }^{\ast }({\frac{1}{2}}^{-})$ state in the $\Lambda p\to \Lambda p{\pi }^0$ reaction
• Flavor structure of $\Lambda$ baryons from lattice QCD: From strange to charm quarks