Abstract
The width of the decay τ− → π−π0ντ was calculated in the extended NJL model. Contact interaction of W boson with a pion pair as well as the contribution of the ρ mesons in the ground and first radialexcited states are taken into account. The sum of the contact diagram and diagram with intermediate ρ meson in the ground state leads to the result which coincides with the result of the vector-dominance model. Our results are in satisfactory agreement with experimental data.
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Volkov, M.K., Kostunin, D.G. τ− → π−π0ντ decay in the extended NJL model. Phys. Part. Nuclei Lett. 10, 7–10 (2013). https://doi.org/10.1134/S1547477113010159
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DOI: https://doi.org/10.1134/S1547477113010159