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 article

Abstract

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
Volume888
Issue number1
DOIs
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

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neutrinos
leptons
decay
energy spectra

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

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title = "Majorana vs. Dirac sterile neutrinos lighter than MW at the LHC",
abstract = "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.",
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Majorana vs. Dirac sterile neutrinos lighter than MW at the LHC. / Dib, C. O.; Kim, C. S.; Wang, K.; Zhang, J.

In: Journal of Physics: Conference Series, Vol. 888, No. 1, 012157, 20.09.2017.

Research output: Contribution to journalConference article

TY - JOUR

T1 - Majorana vs. Dirac sterile neutrinos lighter than MW at the LHC

AU - Dib, C. O.

AU - Kim, C. S.

AU - Wang, K.

AU - Zhang, J.

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N2 - 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.

AB - 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.

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