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Abstract

The Large Hadron electron Collider (LHeC) has been designed to push the field
of deep inelastic scattering to the high energy and intensity frontier using an
intense electron beam with a proton beam from the High Luminosity-Large Hadron
Collider. However, LHeC is also a great laboratory for new physics. In this
work, we propose a search for dark matter that couples with leptons. This may
yield $ej$+ missing energy and $\mu j$ + missing energy signals that can be
potentially observed through simple missing-energy cuts that suppress the
Standard Model background. Considering direct dark matter detection and LHC
constraints, we show that LHeC can indeed discover a weak scale dark matter
fermion for masses up to 350 GeV, which reproduces the correct relic density,
and has interesting implications for lepton flavor violation.