1212.4936 (Bo-Chao Liu et al.)

Mechanism of $K^- p \to ηΛ$ reaction near threshold    [PDF]

Bo-Chao Liu, Ju-Jun Xie

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 $\Gamma=1.5\pm0.5$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.

View original: http://arxiv.org/abs/1212.4936