New method for non-standard invisible particle searches in tau lepton decays

Abstract

Motivated by models proposed to explain the Standard Model anomalies, and the unprecedented ${\tau }^{+}{\tau }^{-}$ data to be collected by the Belle~II experiment during the next years, we study the kinematics of tau pair decays and propose a new method to search for lepton flavor violating processes in tau lepton decays to invisible beyond Standard Model particles, such as $\tau \to \ell \alpha$, where $\ell$ is either an electron or a muon, and $\alpha$ is a massive particle that escapes undetected. The new method improves by one order of magnitude the expected upper limit on the $\tau \to \ell \alpha$ production in 3x1 prong tau decays and establishes the possibility of performing this search in 1x1 prong tau decays which has not been previously considered.

arXiv comment6 pages, 7 figures

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• Direct Detection of Ultralight Dark Matter via Charged Lepton Flavor Violation
• Loop-Level Lepton Flavor Violation and Diphoton Signals in the Minimal Left-Right Symmetric Model
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