Flavorful new physics models in the light of the B decay anomalies
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Date
2021
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Abstract
Current experimental data on the flavor observables R_K and R_K^* shows evidence for a
violation of lepton universality – an essential feature of the Standard Model of particle
physics. Together with several deviations seen in other b -> sµ^+ µ^− observables as well as
R_D and R_D^*, these results constitute the so-called B decay anomalies. In this thesis we
investigate new physics models that provide potential solutions to these anomalies and
put a special emphasis on their flavor structure. To this end, we consider an A4 x U(1)_FN
based flavor symmetry, which addresses the SM flavor puzzle, and study patterns that it
imposes on the couplings of leptoquark models. We find that flavorful leptoquarks provide
good explanations of R_K^(*) , while constraints from rare kaon decays and charged lepton
flavor violating processes are too strong to allow to accommodate the deviations in R_D^(*).
As another consequence of the imposed flavor structure, flavorful leptoquarks are light
enough to be produced at current and future hadron colliders. We compute estimates
for the production cross sections of the S_3 , V_1 and V_3 leptoquarks in different flavor
scenarios, focusing on single production, which is sensitive to the leptoquark coupling
and its flavor structure. We find that future hadron colliders with higher center of mass
energies are needed to cover the full parameter space and determine leptoquark mass
bound for benchmark scenarios.
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Keywords
Flavorphysik, Physik jenseits des Standardmodells