Search for heavy majorana neutrinos in same-sign dilepton channels in proton-proton collisions at √s = 13 TeV

Sirunyan, A. M. and Tumasyan, A. R. and Adam, Wolfgang and Ambrogi, Federico and Asilar, Ece and Md. Ali, Mohd. Adli (2019) Search for heavy majorana neutrinos in same-sign dilepton channels in proton-proton collisions at √s = 13 TeV. Journal of High Energy Physics, 2019 (1). pp. 1-54. ISSN 1126-6708 E-ISSN 1029-8479

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Abstract

A search is performed for a heavy Majorana neutrino (N), produced in leptonic decay of a W boson propagator and decaying into a W boson and a lepton, with the CMS detector at the LHC. The signature used in this search consists of two same-sign leptons, in any flavor combination of electrons and muons, and at least one jet. The data were collected during 2016 in proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.9 fb−1 . The results are found to be consistent with the expected standard model background. Upper limits are set in the mass range between 20 and 1600 GeV in the context of a Type-I seesaw mechanism, on |VeN| 2 , |VµN| 2 , and |VeNV ∗ µN | 2/(|VeN| 2 + |VµN| 2 ), where V`N is the matrix element describing the mixing of N with the standard model neutrino of flavor ` = e, µ. For N masses between 20 and 1600 GeV, the upper limits on |V`N| 2 range between 2.3 × 10−5 and unity. These are the most restrictive direct limits for heavy Majorana neutrino masses above 430 GeV.

Item Type:	Article (Journal)
Additional Information:	7861/71625
Uncontrolled Keywords:	Beyond Standard Model, Hadron-Hadron scattering (experiments)
Subjects:	Q Science > Q Science (General) Q Science > QC Physics
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Science Kulliyyah of Science > Department of Physics
Depositing User:	Dr Mohd Adli MD Ali
Date Deposited:	16 Apr 2019 09:22
Last Modified:	12 Jul 2019 11:16
URI:	http://irep.iium.edu.my/id/eprint/71625

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