Abstract
In the Nambu—Jona-Lasinio model the decay widths τ → (π, π′(1300))ντ were calculated. For the calculation of the decay width τ → πντ the standard NJL model was used with taking into account the intermediate axial-vector meson and the extended Nambu–Jona-Lasinio model with the intermediate a 1(1260) and a′1 (1640) mesons. These results are in good agreement with each other. For the calculation of the decay width τ → π′ντ extended Nambu–Jona-Lasinio model was used. The results are in satisfactory agreement with the experimental data. Numerical estimates for the constant F π and F π′ are also in satisfactory agreement with both the experimental values for F π and the results obtained by calculations on the lattice.
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Ahmadov, A.I., Volkov, M.K. The Decay τ → (π, π′)ν τ in the Nambu–Jona-Lasinio model. Phys. Part. Nuclei Lett. 12, 744–750 (2015). https://doi.org/10.1134/S1547477115060023
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DOI: https://doi.org/10.1134/S1547477115060023