2016/07/31 by Manimala Mitra, Richard Ruiz, Darren J. Scott +1 · 1 citation
Physics and Astronomy · #hep-ph #hep-ex
paper · pdf · doi:10.1103/physrevd.94.095016
published as Phys. Rev. D 94, 095016 (2016) · v2, journal version. PRD (2016). Results unchanged
arxiv created 2017/03/14 · arxiv updated 2017/03/16
We re-examine the discovery potential at hadron colliders of high-mass right-handed (RH) gauge bosons WR - an inherent ingredient of Left-Right Symmetric Models (LRSM). We focus on the regime where the WR is very heavy compared to the heavy Majorana neutrino N, and investigate an alternative signature for WR → N decays. The produced neutrinos are highly boosted in this mass regime. Subsequently, their decays via off-shell WR bosons to jets, i.e., N → ℓ^± j j are highly collimated, forming a single neutrino jet (jN). The final-state collider signature is then ℓ^± jN, instead of the widely studied ℓ^±ℓ^± jj. Present search strategies are not sensitive to this hierarchical mass regime due to the breakdown of the collider signature definition. We take into account QCD corrections beyond next-to-leading order (NLO) that are important for high-mass Drell-Yan processes at the 13 TeV Large Hadron Collider (LHC). For the first time, we evaluate WR production at NLO with threshold resummation at next-to-next-to-leading logarithm (NNLL) matched to the threshold-improved parton distributions. With these improvements, we find that a WR of mass MWR = 3~(4)~[5] TeV and mass ratio of (mN/MWR)<0.1 can be discovered with a 5-6 σ statistical significance at 13 TeV after 10~(100)~[2000]~fb-1 of data. Extending the analysis to the hypothetical 100 TeV Very Large Hadron Collider (VLHC), 5σ can be obtained for WR masses up to MWR=15~(30) with approximately 100~fb-1~(10~ab-1).