Charged fermions below 100 GeV

Abstract How light can a fermion be if it has unit electric charge? We revisit the lore that LEP robustly excludes charged fermions lighter than about 100 GeV. We review LEP chargino searches, and find them to exclude charged fermions lighter than 90 GeV, assuming a higgsino-like cross section. Howe...

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Main Authors: Daniel Egana-Ugrinovic, Matthew Low, Joshua T. Ruderman
Format: Article
Language:English
Published: SpringerOpen 2018-05-01
Series:Journal of High Energy Physics
Subjects:
Online Access:http://link.springer.com/article/10.1007/JHEP05(2018)012
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spelling doaj-a9fdcb6fb62345bfb02b9ce5b162efa22020-11-25T02:16:48ZengSpringerOpenJournal of High Energy Physics1029-84792018-05-012018512710.1007/JHEP05(2018)012Charged fermions below 100 GeVDaniel Egana-Ugrinovic0Matthew Low1Joshua T. Ruderman2C.N. Yang Institute for Theoretical Physics, Stony Brook UniversitySchool of Natural Sciences, Institute for Advanced StudyCenter for Cosmology and Particle Physics, Department of Physics, New York UniversityAbstract How light can a fermion be if it has unit electric charge? We revisit the lore that LEP robustly excludes charged fermions lighter than about 100 GeV. We review LEP chargino searches, and find them to exclude charged fermions lighter than 90 GeV, assuming a higgsino-like cross section. However, if the charged fermion couples to a new scalar, destructive interference among production channels can lower the LEP cross section by a factor of 3. In this case, we find that charged fermions as light as 75 GeV can evade LEP bounds, while remaining consistent with constraints from the LHC. As the LHC collects more data, charged fermions in the 75–100 GeV mass range serve as a target for future monojet and disappearing track searches.http://link.springer.com/article/10.1007/JHEP05(2018)012Beyond Standard ModelSupersymmetric Standard Model
collection DOAJ
language English
format Article
sources DOAJ
author Daniel Egana-Ugrinovic
Matthew Low
Joshua T. Ruderman
spellingShingle Daniel Egana-Ugrinovic
Matthew Low
Joshua T. Ruderman
Charged fermions below 100 GeV
Journal of High Energy Physics
Beyond Standard Model
Supersymmetric Standard Model
author_facet Daniel Egana-Ugrinovic
Matthew Low
Joshua T. Ruderman
author_sort Daniel Egana-Ugrinovic
title Charged fermions below 100 GeV
title_short Charged fermions below 100 GeV
title_full Charged fermions below 100 GeV
title_fullStr Charged fermions below 100 GeV
title_full_unstemmed Charged fermions below 100 GeV
title_sort charged fermions below 100 gev
publisher SpringerOpen
series Journal of High Energy Physics
issn 1029-8479
publishDate 2018-05-01
description Abstract How light can a fermion be if it has unit electric charge? We revisit the lore that LEP robustly excludes charged fermions lighter than about 100 GeV. We review LEP chargino searches, and find them to exclude charged fermions lighter than 90 GeV, assuming a higgsino-like cross section. However, if the charged fermion couples to a new scalar, destructive interference among production channels can lower the LEP cross section by a factor of 3. In this case, we find that charged fermions as light as 75 GeV can evade LEP bounds, while remaining consistent with constraints from the LHC. As the LHC collects more data, charged fermions in the 75–100 GeV mass range serve as a target for future monojet and disappearing track searches.
topic Beyond Standard Model
Supersymmetric Standard Model
url http://link.springer.com/article/10.1007/JHEP05(2018)012
work_keys_str_mv AT danieleganaugrinovic chargedfermionsbelow100gev
AT matthewlow chargedfermionsbelow100gev
AT joshuatruderman chargedfermionsbelow100gev
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