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The Lepton Flavour Violating Higgs Decays at the HL-LHC and the ILC

Banerjee, Shankha; Bhattacherjee, Biplob; Mitra, Manimala; Spannowsky, Michael

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Shankha Banerjee

Biplob Bhattacherjee

Manimala Mitra


Run-I results from the CMS collaboration show an excess of events in the decay h → μτe with a local significances of 2.4σ. This could be the first hint of flavour violation in the Higgs sector. We summarise the bounds on the flavour violating Yukawa couplings from direct searches, low energy measurements and projected future experiments. We discuss the sensitivity of upcoming HL-LHC runs and future lepton colliders in measuring lepton-flavour violating couplings using an effective field theory framework. For the HL-LHC we find limits on BR(h → μτ ) and BR(h → eτ ) ≲ O(0.5)%O(0.5)% and on BR(h → eμ) ≲ O(0.02)%O(0.02)% . For an ILC with center-of-mass energy of 1 TeV we expect BR(h → eτ) and BR(h → μτ ) to be measurable down to O(0.2)%O(0.2)% .


Banerjee, S., Bhattacherjee, B., Mitra, M., & Spannowsky, M. (2016). The Lepton Flavour Violating Higgs Decays at the HL-LHC and the ILC. Journal of High Energy Physics, 2016(07), Article 059.

Journal Article Type Article
Acceptance Date Jun 29, 2016
Online Publication Date Jul 12, 2016
Publication Date Jul 12, 2016
Deposit Date Nov 10, 2016
Publicly Available Date Jan 25, 2017
Journal Journal of High Energy Physics
Print ISSN 1126-6708
Publisher Scuola Internazionale Superiore di Studi Avanzati (SISSA)
Peer Reviewed Peer Reviewed
Volume 2016
Issue 07
Article Number 059


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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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