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The Z Penguin in Generic Extensions of the Standard Model
April 23, 20192:00 pm – 3:00 pm (CDT)

The Z Penguin in Generic Extensions of the Standard Model


Joachim Brod (University of Cincinnati)



Mitchell Institute for Fundamental Physics & Astronomy

College Station, Texas 77843

Event Details

The unitarity of the S-matrix puts significant constraints on UV-complete extensions of the SM. The required cancellation of unbounded high-energy growth of scattering amplitudes leads to specific relations among the coupling constants that are common to all models. This allows to derive manifestly finite expressions of loop-induced observables in generic extensions of the standard model. In this talk, I will discuss the calculation of the “Z penguin” which enters the prediction of several rare meson decays. Using the example of anomalous Z couplings to top quarks, I will illustrate how our approach allows to overcome limitations of the effective theories in the search for new physics. I will also discuss possible future applications of our method.

Video Recording

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