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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 |VμN|2 as a function of Majorana neutrino mass mN for masses in the range of 40–500 GeV, where VμN is the mixing element of the heavy neutrino with the standard model muon neutrino. The limits obtained are |VμN|2 < 0.00470 for mN = 90 GeV, |VμN|2 < 0.0123 for mN = 200 GeV, and |VμN|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:
OSTI Identifier:
1213791
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