Study of the lowest tensor and scalar resonances in the τ → πππvτ decay
1 Institute of Nuclear Physics PAN, Cracow, Poland
2 NSC KIPT Institute for Theoretical Physics, Kharkov, Ukraine
3 Departamento de Física Teórica and Instituto de Física Teórica, IFT-UAM/CSIC, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
4 The Faculty of Physics, Astronomy and Applied Computer Science, Jagellonian University, Cracow, Poland
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Published online: 29 November 2016
In this note we present a new parametrization of the hadronic current for the decay τ → πππvτ derived from the chiral lagrangian with explicit inclusion of resonances. We have included both scalar, vector and axial-vector resonances. For the first time, the lowest tensor resonance (f2(1270)) is included as well. Both single and double-resonance contributions to the hadronic form factors are taken into account. To satisfy the correct high energy behaviour of the hadronic form factors, constraints on numerical values of the vertex constants are obtained.
© The Authors, published by EDP Sciences, 2016
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