The role of $N^{\ast }(2120)$ nucleon resonance in $K\Lambda (1520)$ photon and hadronic productions

Abstract

The associate $K\Lambda (1520)$ photon and hadronic production in the $\gamma p\to K^{+}\Lambda (1520)$, $pp\to p{K}^{+}\Lambda (1520)$ and ${\pi }^{-}p\to K^0\Lambda (1520)$ reactions are investigated within the effective Lagrangian approach and the isobar model. We are interested in the contribution from the $N^{\ast }(2120)$ (previously called $N^{\ast }(2080)$) resonance, which has a significant coupling to the $K\Lambda (1520)$ channel. The theoretical results show that the current experimental data for the $\gamma p\to K^{+}\Lambda (1520)$ reaction favor the existence of the $N^{\ast }(2120)$ resonance, and that these measurements can be used to further constrain its properties. We present results, including the $N^{\ast }(2120)$ contribution, for total cross sections of the $\gamma p\to K^{+}\Lambda (1520)$, ${\pi }^{-}p\to K^0\Lambda (1520)$, and $pp\to p{K}^{+}\Lambda (1520)$ reactions. For this latter one, we also calculate invariant mass and Dalitz plot distributions.

Comments: Talk given at the workshop on Hadron Nuclear Physics, Zhangjiajie, China, July 18 to 22, 2013