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Title: Search for heavy Majorana neutrinos in $$\mu^\pm \mu^\pm+$$ jets events in proton-proton collisions at $$\sqrt{s}$$ = 8 TeV

Our search is performed for heavy Majorana neutrinos (N) using an event signature defined by two muons of the same charge and two jets (μ ±μ ±jj). The data correspond to an integrated luminosity of 19.7 fb -1 of proton–proton collisions at a center-of-mass energy of 8 TeV, collected with the CMS detector at the CERN LHC. We did not observe an excess of events beyond the expected standard model background and upper limits are set on |V μN| 2 as a function of Majorana neutrino mass mN for masses in the range of 40–500 GeV, where V μN is the mixing element of the heavy neutrino with the standard model muon neutrino. The limits obtained are |V μN| 2 < 0.00470 for m N = 90 GeV, |V μN| 2 < 0.0123 for m N = 200 GeV, and |V μN| 2 < 0.583 for mN = 500 GeV. These results extend considerably the regions excluded by previous direct searches.
Authors:
 [1]
  1. Yerevan Physics Inst. (YerPhI) (Armenia). et al.
Publication Date:
Report Number(s):
FERMILAB-PUB-15-026-CMS; CERN-PH-EP-2015-001; CMS-EXO-12-057
Journal ID: ISSN 0370-2693; arXiv eprint number arXiv:1501.05566; TRN: US1601095
Grant/Contract Number:
AC02-07CH11359
Type:
Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 748; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Research Org:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Orgs:
CMS Collaboration
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CMS; physics; heavy neutrino
OSTI Identifier:
1213791
Alternate Identifier(s):
OSTI ID: 1223208