Lepton Number Violation at Colliders from Kinematically Inaccessible Gauge Bosons

Richard Ruiz

doi:10.1140/epjc/s10052-017-4950-2

paper

Lepton Number Violation at Colliders from Kinematically Inaccessible Gauge Bosons

arXiv:1703.04669 · doi:10.1140/epjc/s10052-017-4950-2

Abstract

We reevaluate the necessity of $W_{R}$ gauge bosons being kinematically accessible to test the Left-Right Symmetric Model (LRSM) at hadron colliders. In the limit that $W_{R}$ are too heavy, resonant production of sub-TeV Majorana neutrinos $N$ can still proceed at the Large Hadron Collider (LHC) via the process $pp \to W_{R}^{\pm*} \to N ℓ^{\pm} \to ℓ^{\pm} ℓ^{\pm} + nj$ if mediated by a far off-shell $W_{R}$ . Traditional searches strategies are insensitive to this regime as they rely on momenta of final states scaling with TeV-scale $M_{W_{R}}$ . For such situations, the process is actually kinematically and topologically identical to the direct production (DP) process $pp \to W_{SM}^{\pm*} \to N ℓ^{\pm} \to ℓ^{\pm} ℓ^{\pm} + nj$ . In this context, we reinterpret $s = 8$ TeV LHC constraints on DP rates for the minimal LRSM. For $m_{N} = 200 - 500$ GeV and right-left coupling ratio $κ_{R} = g_{R} / g_{L}$ , we find $(M_{W_{R}} / κ_{R}) > 1.1 - 1.8$ TeV at 95\% CLs. Expected sensitivities to DP at 14 (100) TeV are also recast: with $L = 1 (10) ab^{- 1}$ , one can probe $(M_{W_{R}} / κ_{R}) < 7.9 - 8.9 (14 - 40)$ TeV for $m_{N} = 100 - 700 (1200)$ GeV. Findings in terms of gauge invariant dimension-six operators with heavy $N$ are also reported.

Published version. Minor typos, additional references. Results unchanged

Lepton Number Violation at Colliders from Kinematically Inaccessible Gauge Bosons

Abstract

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