Full next-to-leading order calculations for dark matter pair production in the leptoquarks plus dark matter model*

Abstract The processes involving leptons plus missing energy (and jets) at lepton colliders (electron–positron and muon colliders) are studied in the leptoquarks plus dark matter (DM) model. We calculate the full next-to-leading order (NLO) corrections, including QCD, EW, and ISR, for heavy DM pair production, followed by the heavy DM cascade decay into stable DM and SM fermions. Large logarithmic effects caused by collinear ISR and EW virtual corrections are emphasized. Moreover, we emphasize that NLO corrections become increasingly significant with higher . However, for larger NLO corrections at high , the EW corrections dominate over the QCD corrections. The significance of the signals can be enhanced by applying kinematic cuts. By incorporating the NLO correction factor, the significance of the signal processes could be further improved by approximately 40% and 20% for and channels at a 10 TeV muon collider.