Orateurs
Pedro Machado
Sara Saa Espina
Description
We deal here with the off‐shell renormalization of the chiral effective Lagrangian for physics beyond the Standard Model, based on a non‐linear realization of the $SU(2)_L\times U(1)_Y$ gauge symmetry breaking in the presence of a light Higgs particle, up to four derivatives. We consider the full would‐be Goldstone bosons and Higgs sector of the Lagrangian. All one loop amplitudes are computed using dimensional regularization. Apparent chiral noninvariant divergences are encountered in the process. Nevertheless, they are non‐physical. We provide a method for the renormalization of these amplitudes off‐shell, which involves a redefinition of the would‐be Goldstone boson fields that includes space‐time derivatives and the Higgs field.
Based on work done with Belen Gavela, Kirill Kanshin, Pedro Machado, Sara Saa, Stefano Rigolin
