The decay τ→3πντ and axial-vector meson a1 in the NJL model

2023

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DOI 10.1142/s0217732323501109
Data confidence 70 medium
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Abstract

The branching fractions of [Formula: see text] and [Formula: see text] are calculated within the chiral NJL model. Features of the axial-vector [Formula: see text] meson which play an important role in describing the [Formula: see text] decays are discussed. Permissible values for the mass and width of the [Formula: see text] meson are considered in accordance with the latest experiments.