We study leptonic decays W± → e±e± ∓ and W± → ± ±e∓ which would occur at the LHC if there exist sterile neutrinos with masses below MW . We also study ways to discriminate their Majorana or Dirac character, a rather non trivial task, because lepton number conservation cannot be checked due to the missing neutrino in the final state. We find that it is indeed possible to discriminate between Majorana vs. Dirac sterile neutrinos by comparing the production of e±e± ∓ vs. ± ±e∓ if the N-e and N- mixings are sufficiently different. Alternatively, one could also distinguish the Majorana vs. Dirac character by studying the energy spectra of the opposite charge lepton, a method that works even for equal N-e and N- mixings.
Bibliographical noteFunding 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.
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All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)