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

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

Abstract

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)% .

Citation

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. https://doi.org/10.1007/jhep07%282016%29059

• 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
• DOI: https://doi.org/10.1007/jhep07%282016%29059