Neutrino jets from high-mass WR gauge bosons in TeV-scale left-right symmetric models

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Abstract

We reexamine the discovery potential at hadron colliders of high-mass right-handed (RH) gauge bosons ${W}_{R}$---an inherent ingredient of left-right symmetric models (LRSM). We focus on the regime where the ${W}_{R}$ is very heavy compared to the heavy Majorana neutrino $N$, and we investigate an alternative signature for ${W}_{R}\ensuremath{\rightarrow}N$ decays. The produced neutrinos are highly boosted in this mass regime. Subsequently, their decays via off-shell ${W}_{R}$ bosons to jets, i.e., $N\ensuremath{\rightarrow}{\ensuremath{\ell}}^{\ifmmode\pm\else\textpm\fi{}}jj$, are highly collimated, forming a single neutrino jet $({j}_{N})$. The final-state collider signature is then ${\ensuremath{\ell}}^{\ifmmode\pm\else\textpm\fi{}}{j}_{N}$, instead of the widely studied ${\ensuremath{\ell}}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\ell}}^{\ifmmode\pm\else\textpm\fi{}}jj$. 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 ${W}_{R}$ 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 ${W}_{R}$ of mass ${M}_{{W}_{R}}=3(4)[5]\text{ }\text{ }\mathrm{TeV}$ and mass ratio of $({m}_{N}/{M}_{{W}_{R}})<0.1$ can be discovered with a $5--6\ensuremath{\sigma}$ statistical significance at 13 TeV after $10(100)[2000]\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of data. Extending the analysis to the hypothetical 100 TeV Very Large Hadron Collider (VLHC), $5\ensuremath{\sigma}$ can be obtained for ${W}_{R}$ masses up to ${M}_{{W}_{R}}=15(30)$ with approximately $100\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ ($10\text{ }\text{ }{\mathrm{ab}}^{\ensuremath{-}1}$). Conversely, with $0.9(10)[150]\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of 13 TeV data, ${M}_{{W}_{R}}<3(4)[5]\text{ }\text{ }\mathrm{TeV}$ and $({m}_{N}/{M}_{{W}_{R}})<0.1$ can be excluded at 95% C.L.; with $100\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ ($2.5\text{ }\text{ }{\mathrm{ab}}^{\ensuremath{-}1}$) of 100 TeV data, ${M}_{{W}_{R}}<22(33)\text{ }\text{ }\mathrm{TeV}$ can be excluded.

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