f 1 ( 1285 ) decays into a 0 ( 980 ) π 0 , f 0 ( 980 ) π 0 and isospin breaking
نویسنده
چکیده
Abstract We evaluate the decay width for the processes f1(1285)→ πa0(980) and f1(1285)→ πf0(980) taking into account that all three resonances are dynamically generated from the meson-meson interaction, the f1(1285) from K ∗K̄ − c.c and the a0(980), f0(980) from πη,KK̄ and ππ,KK̄ respectively. We use a triangular mechanism similar to that of the η(1405) → ππη, which provides a decay width for f1(1285) → πa0(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)→ πf0(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.
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