Radiative corrections in weak semi-leptoni processes at low energy: a two-step matching determination
| dc.creator | Moussallam, Bachir | |
| dc.creator | Descotes-Genon, Sebastien | |
| dc.date | 2005-05-10 | |
| dc.date.accessioned | 2026-07-07T12:25:05Z | |
| dc.date.available | 2026-07-07T12:25:05Z | |
| dc.description | We focus on the chiral Lagrangian couplings describing radiative corrections to weak semi-leptonic decays and relate them to the decay amplitude of a lepton, computed by Braaten and Li at one loop in the Standard Model. For this purpose, we follow a two-step procedure. A first matching, from the Standard Model to Fermi theory, yields a relevant set of counterterms. The latter are related to chiral couplings thanks to a second matching, from Fermi theory to the chiral Lagrangian, which is performed using the spurion method. We show that the chiral couplings of physical relevance obey integral representations in a closed form, expressed in terms of QCD chiral correlators and vertex functions. We deduce exact relations among the couplings, as well as numerical estimates which go beyond the usual $\log(M\_Z/M\_ρ)$ approximation. | |
| dc.description | 28 pages, latex | |
| dc.identifier | https://arxiv.org/abs/hep-ph/0505077 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/0505077 | |
| dc.identifier | Eur.Phys.J.C42:403-417,2005 | |
| dc.identifier | doi:10.1140/epjc/s2005-02316-8 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/214518 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Radiative corrections in weak semi-leptoni processes at low energy: a two-step matching determination | |
| dc.type | text |