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Search for sterile neutrinos decaying into pions at the LHC

We study the possibility to observe sterile neutrinos with masses in the range 5  GeV<mN<20  GeV at the LHC, using the exclusive semileptonic modes involving pions, namely W→ℓN→nπℓℓ (n=1,2,3). The two pion and three pion modes require extrapolations of form factors to large time-like q2, which...

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Detalles Bibliográficos
Autores principales: Dib, Claudio O., Kim, C.S., Neill, Nicolás A., Yuan, Xing-Bo
Lenguaje:eng
Publicado: 2018
Materias:
Acceso en línea:https://dx.doi.org/10.1103/PhysRevD.97.035022
http://cds.cern.ch/record/2306365
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author Dib, Claudio O.
Kim, C.S.
Neill, Nicolás A.
Yuan, Xing-Bo
author_facet Dib, Claudio O.
Kim, C.S.
Neill, Nicolás A.
Yuan, Xing-Bo
author_sort Dib, Claudio O.
collection CERN
description We study the possibility to observe sterile neutrinos with masses in the range 5  GeV<mN<20  GeV at the LHC, using the exclusive semileptonic modes involving pions, namely W→ℓN→nπℓℓ (n=1,2,3). The two pion and three pion modes require extrapolations of form factors to large time-like q2, which we do using vector dominance models as well as light front holographic QCD, with remarkable agreement. This mass region is difficult to explore with inclusive ℓℓjj modes or trilepton modes and impossible to explore in rare meson decays. While particle identification is a real challenge in these modes, vertex displacement due to the long living neutrino in the above mass range can greatly help reduce backgrounds. Assuming a sample of 109  W bosons at the end of the LHC Run 2, these modes could discover a sterile neutrino in the above mass range or improve the current bounds on the heavy-to-light lepton mixings by an order of magnitude, |UℓN|2∼2×10-6. Moreover, by studying the equal sign and opposite sign dileptons, the Majorana or Dirac character of the sterile neutrino may be revealed.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2018
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spelling cern-23063652022-08-10T12:29:43Zdoi:10.1103/PhysRevD.97.035022http://cds.cern.ch/record/2306365engDib, Claudio O.Kim, C.S.Neill, Nicolás A.Yuan, Xing-BoSearch for sterile neutrinos decaying into pions at the LHChep-phParticle Physics - PhenomenologyWe study the possibility to observe sterile neutrinos with masses in the range 5  GeV<mN<20  GeV at the LHC, using the exclusive semileptonic modes involving pions, namely W→ℓN→nπℓℓ (n=1,2,3). The two pion and three pion modes require extrapolations of form factors to large time-like q2, which we do using vector dominance models as well as light front holographic QCD, with remarkable agreement. This mass region is difficult to explore with inclusive ℓℓjj modes or trilepton modes and impossible to explore in rare meson decays. While particle identification is a real challenge in these modes, vertex displacement due to the long living neutrino in the above mass range can greatly help reduce backgrounds. Assuming a sample of 109  W bosons at the end of the LHC Run 2, these modes could discover a sterile neutrino in the above mass range or improve the current bounds on the heavy-to-light lepton mixings by an order of magnitude, |UℓN|2∼2×10-6. Moreover, by studying the equal sign and opposite sign dileptons, the Majorana or Dirac character of the sterile neutrino may be revealed.We study the possibility to observe sterile neutrinos with masses in the range between 5 GeV and 20 GeV at the LHC, using the exclusive semileptonic modes involving pions, namely W to lepton + N to n pions + lepton+lepton (n = 1, 2, 3). The two pion and three pion modes require extrapolations of form factors to large time-like $q^2$, which we do using vector dominance models as well as light front holographic QCD, with remarkable agreement. This mass region is difficult to explore with inclusive dilepton+dijet modes or trilepton modes and impossible to explore in rare meson decays. While particle identification is a real challenge in these modes, vertex displacement due to the long living neutrino in the above mass range can greatly help reduce backgrounds. Assuming a sample of $10^9$ W bosons at the end of the LHC Run 2, these modes could discover a sterile neutrino in the above mass range or improve the current bounds on the heavy-to-light lepton mixings by an order of magnitude, $U_{l N}^2 \sim 2 \times 10^{-6}$. Moreover, by studying the equal sign and opposite sign dileptons, the Majorana or Dirac character of the sterile neutrino may be revealed.NCTS-PH-1801arXiv:1801.03624oai:cds.cern.ch:23063652018-01-10
spellingShingle hep-ph
Particle Physics - Phenomenology
Dib, Claudio O.
Kim, C.S.
Neill, Nicolás A.
Yuan, Xing-Bo
Search for sterile neutrinos decaying into pions at the LHC
title Search for sterile neutrinos decaying into pions at the LHC
title_full Search for sterile neutrinos decaying into pions at the LHC
title_fullStr Search for sterile neutrinos decaying into pions at the LHC
title_full_unstemmed Search for sterile neutrinos decaying into pions at the LHC
title_short Search for sterile neutrinos decaying into pions at the LHC
title_sort search for sterile neutrinos decaying into pions at the lhc
topic hep-ph
Particle Physics - Phenomenology
url https://dx.doi.org/10.1103/PhysRevD.97.035022
http://cds.cern.ch/record/2306365
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AT kimcs searchforsterileneutrinosdecayingintopionsatthelhc
AT neillnicolasa searchforsterileneutrinosdecayingintopionsatthelhc
AT yuanxingbo searchforsterileneutrinosdecayingintopionsatthelhc