Search for long-lived heavy neutral leptons with displaced vertices in proton-proton collisions at root s=13 TeV

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F22%3A10445558" target="_blank" >RIV/00216208:11320/22:10445558 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=Ls_mytornD" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=Ls_mytornD</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/JHEP07(2022)081" target="_blank" >10.1007/JHEP07(2022)081</a>

Result language
angličtina
Original language name
Search for long-lived heavy neutral leptons with displaced vertices in proton-proton collisions at root s=13 TeV
Original language description
A search for heavy neutral leptons (HNLs), the right-handed Dirac or Majorana neutrinos, is performed in final states with three charged leptons (electrons or muons) using proton-proton collision data collected by the CMS experiment at root s = 13 TeV at the CERN LHC. The data correspond to an integrated luminosity of 138 fb(-1). The HNLs could be produced through mixing with standard model neutrinos v. For small values of the HNL mass (<20 GeV) and the square of the HNL-v mixing parameter (10(-7)-10(-2)), the decay length of these particles can be large enough so that the secondary vertex of the HNL decay can be resolved with the CMS silicon tracker. The selected final state consists of one lepton emerging from the primary proton-proton collision vertex, and two leptons forming a displaced, secondary vertex. No significant deviations from the standard model expectations are observed, and constraints are obtained on the HNL mass and coupling strength parameters, excluding previously unexplored regions of parameter space in the mass range 1-20 GeV and squared mixing parameter values as low as 10(-7).
Czech name
—
Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10300 - Physical sciences

Project
<a href="/en/project/LG14004" target="_blank" >LG14004: Cooperation of Czech Republic with JINR Dubna in the theoretical and nuclear physics and application of nuclear methods in other fields</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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