Electroweak chiral Lagrangian and new precision measurements

Abstract

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 $\mathrm{WW}\ensuremath{\gamma}$ and $\mathrm{WWZ}$ 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 the chiral Lagrangian operators are also computed in this model.