The $K^- p \to f_1(1285) Λ$ reaction within an effective Lagrangian approach

Abstract

The production of the f1(1285) resonance in the reaction of K − p → f1(1285)Λ is studied within an effective Lagrangian approach. The production process is described by the t channel K * + meson exchange. My theoretical approach is based on the results of chiral unitary theory where the f1(1285) resonance is dynamically generated from the single channel KK * − c.c. interaction. The total and differential cross sections of the K − p → f1(1285)Λ reaction are evaluated. Within the coupling constant of the f1(1285) to KK * channel obtained from the chiral unitary theory and a cut off parameter Λc ∼ 1.5 GeV in the form factors, the experimental measurement can be reproduced. This production process would provide further evidence for the KK * − c.c. nature of the f1(1285) state.