Thesis BELLE2-PTHESIS-2023-014

Search for new physics in charged lepton flavor violating processes at the Belle II experiment.

Marcela Garcia Hernandez ; Ivan Heredia De La Cruz

Cinvestav-IPN Mexico city

Abstract: In particle physics, charged Lepton Flavor Violating (cLFV) processes have not been observed. If they were observed, they would necessarily lead to new physics scenarios. The τ lepton is the heaviest lepton in the Standard Model of particle physics. It is the only lepton heavy enough to decay into leptons or hadrons; moreover, its production mechanisms are well-understood. Thus, τ lepton physics is extremely convenient to search for flavor violation. The Belle II experiment is expected to achieve the world’s largest τ sample in the coming years. This will allow us to search for more than 50 charged lepton flavor violating processes in the τ lepton sector with high precision. Within the Belle II experiment, we work on the search of the cLFV τ^{±} → l^{±} + α decay, where l is either an electron or a muon, and α is an invisible spin-0 boson. In addition, we review the τ^{±} → l^{±} + γ decay, which is a golden mode to search for lepton flavor violation since it has the largest branching ratio in new physics scenarios.

Note: Presented on 12 06 2023
Note: PhD

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 Record created 2023-07-04, last modified 2023-07-04

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