Search for evidence of the type-III seesaw mechanism in multilepton final states in proton-proton collisions at s =13 TeV
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 luminos...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English English |
| Published: |
American Physical Society
2017
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/63073/ http://irep.iium.edu.my/63073/ http://irep.iium.edu.my/63073/ http://irep.iium.edu.my/63073/1/63073_Search%20for%20Evidence%20of%20the%20Type-III_article.pdf http://irep.iium.edu.my/63073/2/63073_Search%20for%20Evidence%20of%20the%20Type-III_scopus.pdf |
| Summary: | 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. |
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