Testing Lepton Flavor Universality with Pion, Kaon, Tau, and Beta Decays

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Abstract

We present an overview of searches for violation of lepton flavor universality with a focus on low energy precision probes using π, K, τ, and nuclear beta decays. We review the current experimental results, summarize the theoretical status within the context of the Standard Model, and discuss future prospects (both experimental and theoretical). We review the implications of these measurements for physics beyond the Standard Model by performing a global model-independent fit to modified W couplings to leptons and four-fermion operators. We also discuss new physics in the context of simplified models and review Standard Model extensions with a focus on those that can explain a possible deviation from unitarity of the Cabibbo-Kobayashi-Maskawa quark mixing matrix.

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Bryman, D., Cirigliano, V., Crivellin, A., & Inguglia, G. (2022, September 26). Testing Lepton Flavor Universality with Pion, Kaon, Tau, and Beta Decays. Annual Review of Nuclear and Particle Science. Annual Reviews Inc. https://doi.org/10.1146/annurev-nucl-110121-051223

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