Constraints on the electroweak chiral Lagrangian from the precision data Original Research Article

In the framework of the effective field theory method, we use the experimental data and the perturbative unitarity bounds to determine the values and uncertainty of all the 11 chiral coefficients (image) of the standard electroweak chiral Lagrangian. Up to linear terms in image, we provide the one-loop renormalization group equations of all the chiral coefficients, which are calculated in the Feynman–ʹt Hooft gauge using the modified minimal subtraction scheme. With the improved renormalization group equations to sum over the logarithmic corrections, we analyze the current experimental uncertainty of oblique correction parameters, image and image. We find that, due to the large uncertainty in the triple gauge-boson coupling measurements, the parameter space of positive image for image is still allowed by the current experimental data. image tends to increase with Λ even in the presence of the operators that contribute to the triple and quartic gauge-boson couplings.