Dispersive representation of the pion vector form factor in τ→π π ν<sub>τ</sub> decays
We propose a dispersive representation of the charged pion vector form factor that is consistent with chiral symmetry and fulfills the constraints imposed by analyticity and unitarity. Unknown parameters are fitted to the very precise data on τ<sup>-</sup> π<sup>-</sup> π<...
Guardado en:
| Autores principales: | , |
|---|---|
| Formato: | Articulo Preprint |
| Lenguaje: | Inglés |
| Publicado: |
2013
|
| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/104374 http://hdl.handle.net/11336/3412 |
| Aporte de: |
| id |
I19-R120-10915-104374 |
|---|---|
| record_format |
dspace |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Física Hadronic tau decays Chiral Lagrangians ρ(770) resonance Electromagnetic form factors Analytic properties of S matrix |
| spellingShingle |
Física Hadronic tau decays Chiral Lagrangians ρ(770) resonance Electromagnetic form factors Analytic properties of S matrix Gómez Dumm, Daniel Alberto Roig, P. Dispersive representation of the pion vector form factor in τ→π π ν<sub>τ</sub> decays |
| topic_facet |
Física Hadronic tau decays Chiral Lagrangians ρ(770) resonance Electromagnetic form factors Analytic properties of S matrix |
| description |
We propose a dispersive representation of the charged pion vector form factor that is consistent with chiral symmetry and fulfills the constraints imposed by analyticity and unitarity. Unknown parameters are fitted to the very precise data on τ<sup>-</sup> π<sup>-</sup> π<sup>0</sup> ν<sub>τ</sub> decays obtained by Belle, leading to a good description of the corresponding spectral function up to a π π squared invariant mass s ≃ 1.5 GeV<sup>2</sup>. We determine the ρ(770) mass and width pole parameters and obtain the values of low energy observables. The significance of isospin breaking corrections is also discussed. For larger values of s, this representation is complemented with a phenomenological description to allow its implementation in the new TAUOLA hadronic currents. |
| format |
Articulo Preprint |
| author |
Gómez Dumm, Daniel Alberto Roig, P. |
| author_facet |
Gómez Dumm, Daniel Alberto Roig, P. |
| author_sort |
Gómez Dumm, Daniel Alberto |
| title |
Dispersive representation of the pion vector form factor in τ→π π ν<sub>τ</sub> decays |
| title_short |
Dispersive representation of the pion vector form factor in τ→π π ν<sub>τ</sub> decays |
| title_full |
Dispersive representation of the pion vector form factor in τ→π π ν<sub>τ</sub> decays |
| title_fullStr |
Dispersive representation of the pion vector form factor in τ→π π ν<sub>τ</sub> decays |
| title_full_unstemmed |
Dispersive representation of the pion vector form factor in τ→π π ν<sub>τ</sub> decays |
| title_sort |
dispersive representation of the pion vector form factor in τ→π π ν<sub>τ</sub> decays |
| publishDate |
2013 |
| url |
http://sedici.unlp.edu.ar/handle/10915/104374 http://hdl.handle.net/11336/3412 |
| work_keys_str_mv |
AT gomezdummdanielalberto dispersiverepresentationofthepionvectorformfactorintppnsubtsubdecays AT roigp dispersiverepresentationofthepionvectorformfactorintppnsubtsubdecays |
| bdutipo_str |
Repositorios |
| _version_ |
1764820442172882944 |