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Prospects for new physics in τ→lμμ at current and future colliders

Hays, Chris; Mitra, Manimala; Spannowsky, Michael; Waite, Philip

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Chris Hays

Manimala Mitra

Philip Waite


The discovery of lepton flavour violating interactions will be striking evidence for physics beyond the Standard Model. Focusing on the three decays τ∓→μ±μ∓μ∓, τ∓→e±μ∓μ∓ and τ∓→e∓μ∓μ±, we evaluate the discovery potential of current and future high-energy colliders to probe lepton flavour violation in the τ sector. Based on this potential we determine the expected constraints on parameters of new physics in the context of the Type-II Seesaw Model, the Left-Right Symmetric Model, and the Minimal Supersymmetric Standard Model. The existing and ongoing 13 TeV run of the Large Hadron Collider has the potential to produce constraints that outperform the existing e+e− collider limits for the τ∓→μ±μ∓μ∓ decay and achieve a branching fraction limit of ≲10−8. With a future circular e+e− collider, constraints on the τ→lμμ branching fractions could reach as low as a few times 10−12.


Hays, C., Mitra, M., Spannowsky, M., & Waite, P. (2017). Prospects for new physics in τ→lμμ at current and future colliders. Journal of High Energy Physics, 2017(5), Article 014.

Journal Article Type Article
Acceptance Date Apr 27, 2017
Online Publication Date May 3, 2017
Publication Date May 3, 2017
Deposit Date Jan 5, 2017
Publicly Available Date May 9, 2017
Journal Journal of High Energy Physics
Print ISSN 1126-6708
Publisher Scuola Internazionale Superiore di Studi Avanzati (SISSA)
Peer Reviewed Peer Reviewed
Volume 2017
Issue 5
Article Number 014
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Copyright Statement
This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.

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