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Chiral Lagrangians as a tool to probe the symmetry-breaking sector of the SM at LEP

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Dobado González, Antonio and Espriu, D. and Herrero, M. J. (1991) Chiral Lagrangians as a tool to probe the symmetry-breaking sector of the SM at LEP. Physics Letters B, 255 (3). pp. 405-414. ISSN 0370-2693

Official URL: http://dx.doi.org/10.1016/0370-2693(91)90786-P




Abstract

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.


Item Type:Article
Uncontrolled Keywords:Standard Model, Higgs Bosons, One-Loop
Subjects:Sciences > Physics
ID Code:22887
Deposited On:19 Sep 2013 15:57
Last Modified:23 Sep 2013 18:12

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