Mechanism of $K^{-}p\to \eta \Lambda$ reaction near threshold

Abstract

Within an effective Lagrangian approach, we investigate the reaction mechanism of $K^{-}p\to \eta \Lambda$ near threshold. It is found that a new $D_{03}$ resonance, with mass $M=1668.5\pm 0.5$MeV and width $\Gamma =1.5\pm 0.5$MeV, is needed to interpret the experimental data reported by the Crystal Ball collaboration. To verify our results, remeasurements on the differential cross sections and $\Lambda$ polarization in this reaction will be helpful. Furthermore, we also show that the reaction $p\bar{p}\to \Lambda \bar{\Lambda }\eta$ is a good place to look for this new resonance if it exists.

Presented at the 20th International IUPAP Conference on Few-Body Problems in Physics, 20 - 25 August, 2012, Fukuoka, Japan

References in corpus (2)

• The $K^{-}p\to \eta \Lambda$ reaction in an effective Lagrangian model
• Evidence for a narrow $D_{03}$ state in $K^{-}p\to \eta \Lambda$ near threshold

Cited by in corpus (2)

• Visible narrow cusp structure in ${\Lambda }_c^{+}\to p{K}^{-}{\pi }^{+}$ enhanced by triangle singularity
• Role of the $\Lambda (1600)$ in the $K^{-}p\to \Lambda {\pi }^0{\pi }^0$ reaction