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The lepton flavour violating Higgs decays at the HL-LHC and the ILC.

Banerjee, Shankha and Bhattacherjee, Biplob and Mitra, Manimala and Spannowsky, Michael (2016) 'The lepton flavour violating Higgs decays at the HL-LHC and the ILC.', Journal of high energy physics., 2016 (07). 059.


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)% .

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Publisher 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.
Date accepted:29 June 2016
Date deposited:25 January 2017
Date of first online publication:12 July 2016
Date first made open access:No date available

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