f1(1285) decays into a0(980)π0, f0(980)π0 and isospin breaking

Regular Article - Theoretical Physics

Abstract.

We evaluate the decay width for the processes f 1(1285) → π0 a 0(980) and f 1(1285) → π0 f 1(980)taking into account that all three resonances are dynamically generated from the meson-meson interaction, the f 1(1285) from \(K^* \bar K - c.c.\) and the a 0(980), f 0(980) from πη, \(K\bar K\) and ππ, \(K\bar K\), respectively. We use a triangular mechanism similar to that of η(1405) → ππη, which provides a decay width for f 1(1285) → π0 a 0(980) with a branching fraction of the order of 30%, in agreement with experiment. At the same time we evaluate the decay width for the isospin-forbidden f 1(1285) → π 0 f 0(980), which appears when we consider different masses for the charged and neutral kaons, and show that it is much more suppressed than in the η(1405) → ππη case, but gives rise to a narrow shape of the π + π distribution similar to the one found in the η(1405) → ππη decay.

Keywords

Invariant Mass Decay Width Invariant Mass Distribution Loop Function Couple Channel 

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Copyright information

© SIF, Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  1. 1.Departamento de Fısica Teórica, Universidad de Valencia and IFICCentro Mixto Universidad de Valencia-CSIC, Institutos de Investigación de PaternaValenciaSpain
  2. 2.Instituto de FísicaUniversidade de São PauloSão PauloBrasil

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