Tau decay and the structure of the a1

Details Tau decay and the structure of the a1 Tau decay and the structure of the a1

2007-08-16

arxiv.org/abs/0708.2223v2

Phys.Lett.B670:22-26,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

Replaced figures, due to an error in the calculation, which we corrected. (Conclusions did not change.) Dropped last part disc

Scientific paper

10.1016/j.physletb.2008.10.025

We analyse the decay $\tau\to\pi\pi\pi\nu$ based on the recently developed
techniques to generate axial-vector resonances dynamically. Under the
assumption that the a1 is a coupled-channel meson-molecule, the spectral
function is described surprisingly well by adjusting only one free parameter.
Including, in addition, an elementary a1 corrupts the results.

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