6533b835fe1ef96bd129f393

RESEARCH PRODUCT

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

subject

description

We evaluate the decay width for the processes f1(1285) → π0a0(980) and f1(1285) → π0f0(980) taking into account that all three resonances are dynamically generated from the meson-meson interaction, the f1(1285) from K*K¯+cc and the a0 (980), f0(980) from πη, KK¯ and ππ, KK¯ respectively. We use a triangular mechanism similar to that of the η(1405)→ππη, which provides a decay width for f1 (1285) → π0a0 (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 f1(1285) → π0 f0(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.