QCD corrections to pair production of Type III Seesaw leptons at hadron colliders

If kinematically accessible, hadron collider experiments provide an ideal laboratory for the direct production of heavy lepton partners in Seesaw models. In the context of the Type III Seesaw Mechanism, the $$ \mathcal{O}\left({\alpha}_s\right) $$ rate and shape corrections are presented for the pair production of hypothetical, heavy SU(2) L triplet leptons in pp collisions at $$ \sqrt{s} $$ = 13, 14 and 100TeV. The next-to-leading order (NLO) K-factors span, approximately, K NLO = 1.1 − 1.4 for both charged current and neutral current processes over a triplet mass range m T = 100 GeV − 2 TeV. Total production cross sections exhibit a − 6 % + 5 % scale dependence at 14 TeV and ±1% at 100 TeV. The NLO differential K-factors for heavy lepton kinematics are largely flat, suggesting that na¨ıve scaling by the total K NLO is reasonably justified. The resummed transverse momentum distribution of the dilepton system is presented at leading logarithmic (LL) accuracy. The effects of resummation are large in TeV-scale dilepton systems. Discovery potential to heavy lepton pairs at 14 and 100 TeV is briefly explored: at the High-Luminosity LHC, we estimate a 4.8 − 6.3σ discovery potential maximally for m T = 1.5 − 1.6 TeV after 3000 fb−1. With 300 (3000) fb−1, there is 2σ sensitivity up to m T = 1.3 − 1.4 TeV (1.7 − 1.8 TeV) in the individual channels. At 100 TeV and with 10 fb−1, a 5σ discovery can be achieved for m T = 1.4 − 1.6 TeV. Due to the factorization properties of Drell-Yan-type systems, the fixed order and resummed calculations reduce to convolutions over tree-level quantities.

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