Decays f₁ → a₀ π,πππ(η) and f₁ → K K π in the chiral U(3) × U(3) quark NJL model

2025/06/08 by M. K. Volkov, Volkov, M. K., А. А. Пивоваров +3
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #Quantum and Classical Electrodynamics

paper · pdf · doi:10.48550/arxiv.2506.07065

openalex publication_date 2025/06/08 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30

Abstract

The branching fractions of the axial vector meson decays f₁ → a₀ π,ππη, f₁ → ρπ,πππ and f₁ → KKπ are calculated in the standard U(3) × U(3) quark NJL model. The intermediate channels with the states a₀(980)π and f₀(500)η are taken into account in the decay f₁ → ππη. In the case of the scalar mesons, the qq representation as a chiral symmetric partners of the pseudoscalar mesons is used. It is shown that the decays f₁ → ρπ and f₁ →3π occur due to the mass difference of the u and d quarks. All the results are obtained without using any additional arbitrary parameters and are in satisfactory agreement with the known experimental data.

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