Leptonic scalars at the LHC

André de Gouvêa, P. S.Bhupal Dev, Bhaskar Dutta, Tathagata Ghosh, Tao Han, Yongchao Zhang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


We explore the collider prospects of neutrino non-standard interaction with a Standard Model (SM) gauge-singlet leptonic scalar ϕ carrying two units of lepton-number-charge. These leptonic scalars are forbidden from interacting with the SM fermions at the renormalizable level and, if one allows for higher-dimensional operators, couple predominantly to SM neutrinos. For masses at or below the electroweak scale, ϕ decays exclusively into neutrinos. Its characteristic production signature at hadron collider experiments like the LHC would be via the vector boson fusion process and leads to same-sign dileptons, two forward jets in opposite hemispheres, and missing transverse energy, i.e., pp→ℓα±ℓβ±jj+ETmiss(αβ=eμτ). Exploiting the final states of electrons and muons, we estimate, for the first time, the sensitivity of the LHC to these lepton-number-charged scalars. We show that the LHC sensitivity is largely complementary to that of low-energy precision measurements of the decays of charged leptons, charged mesons, W, Z and the SM Higgs boson, as well as the neutrino beam experiments like MINOS, and searches for neutrino self-interactions at IceCube and in cosmological observations. For ϕ mass larger than roughly 10 GeV, our projected LHC sensitivity would surpass all existing bounds.

Original languageEnglish (US)
Article number142
JournalJournal of High Energy Physics
Issue number7
StatePublished - Jul 1 2020


  • Beyond Standard Model
  • Higgs Physics
  • Neutrino Physics

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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