Search for evidence of the type-III seesaw mechanism in multilepton final states 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 (2017) Search for evidence of the type-III seesaw mechanism in multilepton final states in proton-proton collisions at s =13 TeV. Physical Review Letters, 119 (22). pp. 1-17. ISSN 0031-9007 E-ISSN 1079-7114

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Abstract

A search for a signal consistent with the type-III seesaw mechanism in events with three or more electrons or muons is presented. The data sample consists of proton-proton collisions at ffiffi s p ¼ 13 TeV collected by the CMS experiment at the LHC in 2016 and corresponds to an integrated luminosity of 35.9 fb−1. Selection criteria based on the number of leptons and the invariant mass of oppositely charged lepton pairs are used to distinguish the signal from the standard model background. The observations are consistent with the expectations from standard model processes. The results are used to place limits on the production of heavy fermions of the type-III seesaw model as a function of the branching ratio to each lepton flavor. In the scenario of equal branching fractions to each lepton flavor, heavy fermions with masses below 840 GeV are excluded. This is the most sensitive probe to date of the type-III seesaw mechanism.

Item Type:	Article (Journal)
Additional Information:	7861/63073
Uncontrolled Keywords:	Evidence of the type-III; Seesaw mechanism; Multilepton final states in Proton-Proton Collisions at ffiffi s p = 13 TeV
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:	09 Nov 2018 16:57
Last Modified:	09 Nov 2018 16:57
URI:	http://irep.iium.edu.my/id/eprint/63073

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