Study of f₁(1420) and η(1405) in the decay J/ψ→ γπ⁰π⁰π⁰

2025/06/05 by BESIII Collaboration, Ablikim, M., Achasov, M. N. +652
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.2506.05055

Abstract

A partial-wave analysis is performed on the decay J/ψ→γπ⁰π⁰π⁰ within the π⁰π⁰π⁰ invariant-mass region below 1.6 GeV/c², using (10.09~±~0.04)×10⁹ ~J/ψ events collected with the BESIII detector. Significant isospin-violating decays of η(1405) and f₁(1420) into f₀(980)π⁰ are observed. For the first time, three axial-vectors, f₁(1285), f₁(1420) and f₁(1510), are observed to decay into π⁰π⁰π⁰. The product branching fractions of these resonances are reported.

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