Testing the origin of the “f1(1420)” with the K¯p→Λ(Σ)KK¯π reaction

Abstract

We study the $\overline{K}p\to YK\overline{K}\pi$ reactions with $\overline{K}={\overline{K}}^0,K^{-}$ and $Y={\mathrm{\Sigma }}^0,{\mathrm{\Sigma }}^{+},\mathrm{\Lambda }$, in the region of $K\overline{K}\pi$ invariant masses of $1200-1550$ MeV. The strong coupling of the $f_1(1285)$ resonance to $K^{\ast }\overline{K}$ makes the mechanism based on $K^{\ast }$ exchange very efficient to produce this resonance observed in the $K\overline{K}\pi$ invariant mass distribution. In addition, in all these reactions one observes an associated peak at 1420 MeV which comes from the $K^{\ast }\overline{K}$ decay mode of the $f_1(1285)$ when the $K^{\ast }$ is placed on shell at higher invariant masses. We call the attention to the possibility that the peaks observed in other reactions where the “$f_1(1420)$” is observed have a similar origin.