Heavy Majorana neutrinos in the effective Lagrangian description: Application to hadron colliders Águila Giménez, Francisco Del Bar-Sahlom, Shaouly Soni, Amarjit Wudka, Jose Hadron colliders Majorana Neutrinos physics We consider the effects of heavy Majorana neutrinos N with sub-TeV masses. We argue that the mere presence of these particles would be a signal of physics beyond the minimal seesaw mechanism and their interactions are, therefore, best described using an effective Lagrangian. We then consider the complete set of leading effective operators (up to dimension 6) involving the N and Standard Model fields and show that these interactions can be relatively easy to track at high-energy colliders. For example, we find that an exchange of a TeV-scale heavy vector field can yield thousands of characteristic same-sign lepton number violating l^+ l^+ j j events (j=light jet) at the LHC if m_N < 600 GeV, which can also have a distinctive forward-backward asymmetry signal; even the Tevatron has good prospects for this signature if m_N < 300 GeV. 2014-03-06T14:05:10Z 2014-03-06T14:05:10Z 2009 journal article Águila, F.; et al. Heavy Majorana neutrinos in the effective Lagrangian description: Application to hadron colliders. Physics Letters B, 670(4-5): 399-402 (2009). [http://hdl.handle.net/10481/30721] 0370-2693 doi: 10.1016/j.physletb.2008.11.031 arXiv:0806.0876v2 http://hdl.handle.net/10481/30721 eng http://creativecommons.org/licenses/by-nc-nd/3.0/ open access Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License Elsevier