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Z lepton flavour violation as a probe for new physics at future e+e- colliders

Calibbi, L and Marcano, X and Roy, J (2021) Z lepton flavour violation as a probe for new physics at future e+e- colliders. In: European Physical Journal C, 81 (12).

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Official URL: https://doi.org/10.1140/epjc/s10052-021-09777-3


In this work we assess the potential of discovering new physics by searching for lepton-flavour-violating (LFV) decays of the Z boson, Z� �i�j, at the proposed circular e+e- colliders CEPC and FCC-ee. Both projects plan to run at the Z-pole as a �Tera Z factory�, i.e., collecting O(10 12) Z decays. In order to discuss the discovery potential in a model-independent way, we revisit the LFV Z decays in the context of the Standard Model effective field theory and study the indirect constraints from LFV μ and � decays on the operators that can induce Z� �i�j. We find that, while the Z� μe rates are beyond the expected sensitivities, a Tera Z factory is promising for Z� �� decays, probing New Physics at the same level of future low-energy LFV observables. © 2021, The Author(s).

Item Type: Journal Article
Publication: European Physical Journal C
Publisher: Springer Science and Business Media Deutschland GmbH
Additional Information: The copyright for this article belongs to the Author.
Department/Centre: Division of Physical & Mathematical Sciences > Centre for High Energy Physics
Date Deposited: 06 Jan 2022 11:38
Last Modified: 06 Jan 2022 11:38
URI: http://eprints.iisc.ac.in/id/eprint/70821

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