Constrained Electroweak Chiral Lagrangian
نویسنده
چکیده
We update the uncertainty analysis on S parameter of the electroweak chiral Lagrangian (EWCL) by including the LEP-II W pair production data. We find that experimental data still allow a positive S EXP (1TeV).
منابع مشابه
New Terms for the Compact Form of Electroweak Chiral Lagrangian
The compact form of the electroweak chiral Lagrangian is a reformulation of its original form and is expressed in terms of chiral rotated electroweak gauge fields, which is crucial for relating the information of underlying theories to the coefficients of the lowenergy effective Lagrangian. However the compact form obtained in previous works is not complete. In this letter we add several new ch...
متن کاملThe Electroweak Chiral Lagrangian as an Effective Field Theory of the Standard Model with a Heavy Higgs
Using effective field theory methods, we integrate out the standard model Higgs boson to one loop and represent its non-decoupling effects by a set of gauge invariant effective operators of the electroweak chiral Lagrangian. We briefly discuss the relation between the renormalization of both the standard model and the effective theory, which is crucial for a correct understanding and use of the...
متن کاملThe Electroweak Chiral Lagrangian and New Precision Measurements
A revised and complete list of the electroweak chiral lagrangian operators up to dimension-four is provided. The connection of these operators to the S, T and U parameters and the parameters describing the triple gauge boson vertices WWγ and WWZ is made, and the size of these parameters from new heavy physics is estimated using a one flavor-doublet model of heavy fermions. The coefficients of t...
متن کاملDynamical Computation on Coefficients of Electroweak Chiral Lagrangian from One-doublet and Topcolor-assisted Technicolor Models
Abstract Based on previous studies deriving the chiral Lagrangian for pseudo scalar mesons from the first principle of QCD, we derive the electroweak chiral Lagrangian and build up a formulation for computing its coefficients from one-doublet technicolor model and a schematic topcolor-assisted technicolor model. We find that the coefficients of the electroweak chiral Lagrangian for the topcolor...
متن کاملThe radiative corrections of the electroweak chiral Lagrangian with renormalization group equations
We show the computational procedure of the renormalization of the electroweak chiral Lagrangian (the 4D Higgsless standard model), and provide one simplified version of its one-loop renormalization group equations, which we demonstrate its simplicity and reliability. By analyzing the solutions of the one-loop renormalization group equations of the electroweak chiral Lagrangian, we study the par...
متن کامل