Journal
JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 5, Pages -Publisher
SPRINGER
DOI: 10.1007/JHEP05(2018)012
Keywords
Beyond Standard Model; Supersymmetric Standard Model
Categories
Funding
- Institute for Advanced Study
- NSF CAREER [PHY-1554858]
- National Science Foundation [PHY-1607611]
- [PHY-1620628]
- Direct For Mathematical & Physical Scien
- Division Of Physics [1554858] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1620628] Funding Source: National Science Foundation
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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.
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