학술논문
Search for heavy Majorana or Dirac neutrinos and right-handed W gauge bosons in final states with charged leptons and jets in pp collisions at s=13 TeV with the ATLAS detector
Document Type
Original Paper
Author
Source
The European Physical Journal C: Particles and Fields. 83(12)
Subject
Language
English
ISSN
1434-6052
Abstract
A search for heavy right-handed Majorana or Dirac neutrinos NRWR-1s=13WRNRm(WR)=6.4NRm(NR)<1NRm(WR)=4.8m(NR)m(WR)=5.2 and heavy right-handed gauge bosons NRWR-1s=13WRNRm(WR)=6.4NRm(NR)<1NRm(WR)=4.8m(NR)m(WR)=5.2 is performed in events with energetic electrons or muons, with the same or opposite electric charge, and energetic jets. The search is carried out separately for topologies of clearly separated final-state products (“resolved” channel) and topologies with boosted final states with hadronic and/or leptonic products partially overlapping and reconstructed as a large-radius jet (“boosted” channel). The events are selected from pp collision data at the LHC with an integrated luminosity of 139 fbNRWR-1s=13WRNRm(WR)=6.4NRm(NR)<1NRm(WR)=4.8m(NR)m(WR)=5.2 collected by the ATLAS detector at NRWR-1s=13WRNRm(WR)=6.4NRm(NR)<1NRm(WR)=4.8m(NR)m(WR)=5.2 TeV. No significant deviations from the Standard Model predictions are observed. The results are interpreted within the theoretical framework of a left-right symmetric model, and lower limits are set on masses in the heavy right-handed NRWR-1s=13WRNRm(WR)=6.4NRm(NR)<1NRm(WR)=4.8m(NR)m(WR)=5.2 boson and NRWR-1s=13WRNRm(WR)=6.4NRm(NR)<1NRm(WR)=4.8m(NR)m(WR)=5.2 plane. The excluded region extends to about NRWR-1s=13WRNRm(WR)=6.4NRm(NR)<1NRm(WR)=4.8m(NR)m(WR)=5.2 TeV for both Majorana and Dirac NRWR-1s=13WRNRm(WR)=6.4NRm(NR)<1NRm(WR)=4.8m(NR)m(WR)=5.2 neutrinos at NRWR-1s=13WRNRm(WR)=6.4NRm(NR)<1NRm(WR)=4.8m(NR)m(WR)=5.2 TeV. NRWR-1s=13WRNRm(WR)=6.4NRm(NR)<1NRm(WR)=4.8m(NR)m(WR)=5.2 with masses of less than 3.5 (3.6) TeV are excluded in the electron (muon) channel at NRWR-1s=13WRNRm(WR)=6.4NRm(NR)<1NRm(WR)=4.8m(NR)m(WR)=5.2 TeV for the Majorana neutrinos, and limits of NRWR-1s=13WRNRm(WR)=6.4NRm(NR)<1NRm(WR)=4.8m(NR)m(WR)=5.2 up to 3.6 TeV for NRWR-1s=13WRNRm(WR)=6.4NRm(NR)<1NRm(WR)=4.8m(NR)m(WR)=5.2 (5.0) TeV in the electron (muon) channel are set for the Dirac neutrinos. These constitute the most stringent exclusion limits to date for the model considered.