Decays τ→ f₀(π,K) ν_τ and τ→ 3 πν_τ accounting for the contribution of f₀(500)

2024/12/15 by M. K. Volkov, Volkov, M. K., A. A. Pivovarov +3
Physics and Astronomy · #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.2412.11093

Abstract

In the U(3) × U(3) quark NJL model, τ lepton decays with the production of scalar mesons f₀(π,K]) and neutrinos are studied, where f₀=f₀(500), f₀(980). It is shown that these decays mainly occur via contact channels and channels with axial-vector mesons a₁, K₁(1270) and K₁(1400). All mesons are considered as quark-antiquark states in this case. The obtained results can be considered as predictions for future experiments. The obtained estimates for the branching fractions of the τ→ π^-2π⁰ ν_τ decay taking into account the contributions of the ρπ and f₀(500)π states are in satisfactory agreement with experimental data.

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