RT Journal Article
T1 Chiral Lagrangians as a tool to probe the symmetry-breaking sector of the SM at LEP
A1 Dobado González, Antonio
A1 Espriu, Domènec
A1 Herrero, M. J.
AB An effective SU(2)L X U(1)Y invariant chiral lagrangian can accommodate any symmetry breaking scheme in the standard model. It is shown that all process-independent quantities relevant to LEP precision measurements (DELTA-rho, DELTA-K and DELTA-r) depend only on one coefficient of the weak chiral lagrangian, taking different values depending on the precise symmetry breaking scheme. We remove any ambiguity due to the use of an effective theory by a careful choice of observables and make definite predictions that can be tested in the foreseeable future. Our analysis complements nicely that of longitudinal W and Z scattering.
PB Elsevier Science BV
SN 0370-2693
YR 1991
FD 1991-02-14
LK https://hdl.handle.net/20.500.14352/58757
UL https://hdl.handle.net/20.500.14352/58757
DS Docta Complutense
RD 8 jun 2025