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Speaker: Peter Stangl, University of Bern
Title: The global SMEFT likelihood and applications to new physics interpretations
Abstract:
I present a global likelihood function in the space of dimension-six
Wilson coefficients in the Standard Model Effective Field Theory (SMEFT)
above the electroweak (EW) scale and the Weak Effective Theory (WET)
below the EW scale, which includes more than 400 observables from
flavour physics, EW precision tests, beta decays, and Higgs physics.
This likelihood can serve as a basis either for model-independent fits
or for testing dynamical models.
Using the global likelihood in the WET, I discuss new physics
interpretations of the so-called "Flavour anomalies" in rare B-meson
decays, which correspond to several measurements that deviate from the
Standard Model (SM) predictions. Among them is the recently updated LHCb
measurement of the lepton flavor universality (LFU) observable RK, for
which LHCb found a 3.1 sigma deviation from the SM and has reported
evidence for violation of LFU.
As a second example, I apply the global likelihood to a dynamical
leptoquark model that can explain not only the deviations in rare
B-decays but also the measurements of the anomalous magnetic moment of
the muon, which show a 4.2 sigma tension with the SM prediction.