https://doi.org/10.1140/epjc/s10052-017-4950-2
Regular Article - Theoretical Physics
Lepton number violation at colliders from kinematically inaccessible gauge bosons
1
Department of Physics, Institute for Particle Physics Phenomenology (IPPP), Durham University, Durham, DH1 3LE, UK
2
DARC, Green Lane, Durham, DH1 3JU, UK
* e-mail: richard.ruiz@durham.ac.uk
Received:
19
March
2017
Accepted:
28
May
2017
Published online:
6
June
2017
We reevaluate the necessity of 
gauge bosons being kinematically accessible to test the left–right symmetric model (LRSM) at hadron colliders. In the limit that are too heavy, resonant production of sub-TeV Majorana neutrinos N can still proceed at the Large Hadron Collider (LHC) via the process 
if mediated by a far off-shell . Traditional searches strategies are insensitive to this regime as they rely on momenta of final states scaling with TeV-scale 
. For such situations, the process is actually kinematically and topologically identical to the direct production (DP) process 
. In this context, we reinterpret 
TeV LHC constraints on DP rates for the minimal LRSM. For 
200–500 GeV and right–left coupling ratio 
, we find 
1.1–1.8 TeV at 95% CLs. Expected sensitivities to DP at 14 (100) TeV are also recast: with 
ab
, one can probe 
7.9–8.9 (14–40) TeV for 100–700 (1200) GeV, well beyond the anticipated sensitivity of resonant searches. Findings in terms of gauge invariant dimension-six operators with heavy N are also reported.
© The Author(s), 2017
