Majorana vs. Dirac sterile neutrinos lighter than MW at the LHC

C. O. Dib, C. S. Kim, K. Wang, J. Zhang

Research output: Contribution to journalConference articlepeer-review


We propose to study the leptonic decays W± → e±e±μ ν and W± → μ±μ±e ν at the LHC to discover sterile neutrinos with masses below MW , and discriminate their Majorana or Dirac character. These decays are induced by a sterile neutrino N that goes on mass shell in the intermediate state. We find that, even though the final (anti-)neutrino goes undetected and thus lepton number is unchecked, one can distinguish between the Majorana vs. Dirac character of the intermediate sterile neutrino by comparing the production of e±e±μ vs. μ±μ±e , provided the N-e and N-μ mixings are different enough. Alternatively, one can also distinguish the Majorana vs. Dirac character by studying the energy spectra of the opposite charge lepton, a method that works even if the N-e and N-μ mixings are equal.

Original languageEnglish
Article number012157
JournalJournal of Physics: Conference Series
Issue number1
Publication statusPublished - 2017 Sep 20
Event27th International Conference on Neutrino Physics and Astrophysics, Neutrino 2016 - South Kensington, United Kingdom
Duration: 2016 Jul 42016 Jul 9

Bibliographical note

Funding Information:
Work supported in part by: Chile grants Fondecyt 1130617, Conicyt ACT 1406 and FB0821; the Korean gov. NRF grant of the MEST 2011-0017430 and 2011-0020333; the Innovation Program of the IHEP grant Y4515570U1, and the International Postdoctoral Exchange Fellowship Program 90, OCPC, 205, China.

Publisher Copyright:
© Published under licence by IOP Publishing Ltd.

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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