Articulo
Dispersive analysis of τ− → π−π⁰ντ Belle data
Registro en:
issn:0920-5632
Autor
Gómez Dumm, Daniel Alberto
Roig, Pablo
Institución
Resumen
We analyse Belle data on the decay τ− → π−π⁰ν<sub>τ</sub> using a dispersive representation of the vector form factor which is consistent with chiral symmetry and preserves analyticity and unitarity exactly. We fit the unknown theoretical parameters from the data, determining the values of the related low-energy observables 〈 r² 〉<sup>π</sup><sub>V</sub> and c<sup>π</sup><sub>V</sub>. The implementation of isospin breaking effects is also discussed. Facultad de Ciencias Exactas Instituto de Física La Plata