Sensitivity of μ → <i>e</i> processes to τ flavor change

Ardu, Marco, Davidson, Sacha and Gorbahn, Martin
(2022) Sensitivity of μ → <i>e</i> processes to τ flavor change. PHYSICAL REVIEW D, 105 (9). 096040-.

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Transforming a μ to a τ, then the τ to to an e, results in μ→e. In an effective field theory (EFT) framework, we explore the sensitivity of μ→e observables to products of (μ→τ)×(τ→e) interactions and show that the exceptional sensitivity of upcoming μ↔e experiments could allow us to probe parameter space beyond the reach of upcoming τ↔l searches in Higgs, τ, and B decays. We describe the τ↔l interactions as dimension six operators in the SM EFT, identify pairs of them giving interesting contributions to μ↔e processes, and obtain the anomalous dimensions mixing those pairs into dimension eight μ→e operators. We find that μ→e processes are sensitive to τ flavor-changing B decays at rates comparable to current B anomalies, but lepton flavour violating operators cannot reduce B rates - as appropriate in many current B anomalies - because they do not interfere with the SM.

Item Type: Article
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 14 Sep 2022 14:35
Last Modified: 15 Mar 2024 05:56
DOI: 10.1103/PhysRevD.105.096040
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