In:
Journal of High Energy Physics, Springer Science and Business Media LLC, Vol. 2019, No. 1 ( 2019-01)
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 | V eN | 2 , | V μ N | 2 , and | V eN V μN * | 2 /(| V eN | 2 + | V μ N | 2 ), where V ℓN is the matrix element describing the mixing of N with the standard model neutrino of flavor ℓ = e , μ . For N masses between 20 and 1600 GeV, the upper limits on | V ℓN | 2 range between 2 . 3 × 10 −5 and unity. These are the most restrictive direct limits for heavy Majorana neutrino masses above 430 GeV.
Type of Medium:
Online Resource
ISSN:
1029-8479
DOI:
10.1007/JHEP01(2019)122
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2019
detail.hit.zdb_id:
2027350-2
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