Searching for signatures around 1920 MeV of a $N^{\ast }$ state of three hadron nature

Abstract

We provide a series of arguments which support the idea that the peak seen in the $\gamma p\to K^{+}\Lambda$ reaction around 1920 MeV should correspond to the recently predicted state of $J^P=1/2^{+}$ as a bound state of $K\bar{K}N$ with a mixture of $a_0(980)N$ and $f_0(980)N$ components. At the same time we propose polarization experiments in that reaction as a further test of the prediction, as well as a study of the total cross section for $\gamma p\to K^{+}{K}^{-}p$ at energies close to threshold and of $d\sigma /d{M}_{inv}$ for invariant masses close to the two kaon threshold.

Comments: published version