  Two of the important implications of the seesaw mechanism are: (i) a simple
way to understand the small neutrino masses, and (ii) the origin of
matter-anti-matter asymmetry in the universe via the leptogenesis mechanism.
For TeV-scale seesaw models, successful leptogenesis requires that the
right-handed neutrinos (RHNs) must be quasi-degenerate and if they have CP
violating phases, they also contribute to the CP asymmetry. We investigate this
in the TeV-scale left-right models for seesaw and point out a way to probe the
quasi-degeneracy possibility with CP violating mixings for RHNs in hadron
colliders using simple observables constructed out of same-sign dilepton charge
asymmetry (SSCA). In particular, we isolate the parameter regions of the model,
where the viability of leptogenesis can be tested using the SSCA at the Large
Hadron Collider, as well as future 27 TeV and 100 TeV hadron colliders. We also
independently confirm an earlier result that there is a generic lower bound on
the $W_R$ mass of about 10 TeV for leptogenesis to work.
