Search for light sterile neutrinos from W± decays at the LHC SEARCH for LIGHT STERILE NEUTRINOS from W± ... DIB, KIM, and ARAYA

Claudio O. Dib, C. S. Kim, Sebastian Tapia Araya

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5 Citations (Scopus)


We study the feasibility to observe sterile neutrinos with masses in the range 5 GeV<mN<20 GeV at the LHC, using exclusive semileptonic modes involving pions, W→ℓN→πℓℓ, 2πℓℓ, and 3πℓℓ. We thus cover a mass window that is between what can be studied in meson factories and high-energy colliders. We run simulations for these exclusive events, where pions should be distinguished from the background provided the neutrino decay exhibits a vertex displacement from its production point. In a previous work, we have estimated the theoretical rates, and here we analyze the observability of the processes at the LHC, given the fact that exclusive hadronic states may be difficult to identify. We study the sensitivity bounds for the observation and discovery of sterile neutrinos in the above mass range. By the end of run 3, current bounds on heavy-to-light lepton mixings in the lower-mass end (∼5 GeV) could be improved by about an order of magnitude to |UℓN|2∼5×10-6, and the High-Luminosity LHC could reach |UℓN|2 3×10-7 in the mass range below 11 GeV. Studying in addition equal-sign and opposite-sign dileptons, the Majorana or Dirac character of the sterile neutrino could be revealed.

Original languageEnglish
Article number035022
JournalPhysical Review D
Issue number3
Publication statusPublished - 2020 Feb 1

Bibliographical note

Funding Information:
C. S. K. was supported in part by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIP) (NRF-2018R1A4A1025334). S. T. A. was supported in part by the National Science Foundation (NSF) Grant No. 1812377. This work was supported by FONDECYT (Chile) Grant No. 1170171 and CONICYT (Chile) PIA/Basal FB0821.

Publisher Copyright:
© 2020 authors. Published by the American Physical Society.

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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