Abstract
The signatures of heavy fermionic isotriplets (Sigma ) are probed through their direct production and subsequent decay at high energy electron–positron colliders. Unlike the case of LHC, the production process has strong dependence on the mixing of Sigma with electron (V_{e}), making the leptonic collider unique to fingerprint the presence of such mixing. We establish that pair production considered at sqrt{s}=2 TeV can be employed to study both the cases of V_e=0 and of V_ene 0 with sim 100 fb^{-1} luminosity, while the single production can probe the latter case with a few inverse femto barn luminosity at sqrt{s}=1 TeV. Exploring the mass reach, both the single and pair productions are capable of probing Sigma of mass close to the kinematic limits through selected channels. Investigating simultaneous limits on the M_Sigma -V_e parameter space, we identify suitable final states and their 3sigma reach on V_e and M_Sigma at 300 (100) fb^{-1} luminosity in the case of pair (single) Sigma production.
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