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The diverse and distinct collider phenomenology of color-sextet scalarsmotivates thorough investigation of their effective couplings to the StandardModel at the LHC. Some of the more unique sextet signals involve not only jetsbut also leptons. In previous work, we proposed an LHC search for color-sextetscalars in a channel with jets and a hard opposite-sign lepton pair, whichresults from a dimension-six coupling. In this sequel we study the counterpartprocesses with neutrinos, which produce jets in association with missingtransverse energy ($E_{\text{T}}^{\text{miss}}$) in addition to possibleleptons. We consider multiple search channels, including both single and pairsextet production, all characterized by significant missing energy and somefeaturing distinctive kinematic features. Our multifaceted study consists ofthree reinterpreted existing searches and a joint-likelihood analysis designedby us to maximize HL-LHC sensitivity to single sextet production. We show thatour dedicated strategy in the jets + lepton + $E_{\text{T}}^{\text{miss}}$channel can supersede today's limits from reinterpreted searches, and we makesensitivity projections for the HL-LHC. Altogether, our analysis can excludesextet scalars lighter than 4.4 TeV or probe effective cutoffs as high as 16.8TeV.

Leptonic signatures of color-sextet scalars II: Exploiting unique large-$E_{\text{T}}^{\text{miss}}$ signals at the LHC