Testing the origin of the “$$f_1(1420)$$ f1(1420) ” with the $${\bar{K}} p \rightarrow \Lambda (\Sigma ) K{\bar{K}} \pi $$ K¯p→Λ(Σ)KK¯π reaction

Abstract

Abstract We study the $${\bar{K}} p \rightarrow Y K{\bar{K}} \pi $$ K¯p→YKK¯π reactions with $${\bar{K}} = {\bar{K}}^0, K^-$$ K¯=K¯0,K- and $$Y=\Sigma ^0, \Sigma ^+, \Lambda $$ Y=Σ0,Σ+,Λ , in the region of $$K{\bar{K}} \pi $$ KK¯π invariant masses of $$1200-1550$$ 1200-1550 MeV. The strong coupling of the $$f_1(1285)$$ f1(1285) resonance to $$K^* {\bar{K}}$$ K∗K¯ makes the mechanism based on $$K^*$$ K∗ exchange very efficient to produce this resonance observed in the $$K{\bar{K}} \pi $$ KK¯π invariant mass distribution. In addition, in all these reactions one observes an associated peak at 1420 MeV which comes from the $$K^* {\bar{K}}$$ K∗K¯ decay mode of the $$f_1(1285)$$ f1(1285) when the $$K^*$$ K∗ is placed on shell at higher invariant masses. We call the attention to the possibility that the peaks observed in other reactions where the “$$f_1(1420)$$ f1(1420) ” is observed have a similar origin.