科研之友
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摘要
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 -> 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(+/-) jj, are highly collimated, forming a single neutrino jet (j(N)). 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 M-WR = 3(4)[5] TeV and mass ratio of (m(N)/M-WR) < 0.1 can be discovered with a 5-6 sigma statistical significance at 13 TeVafter 10(100)[2000] fb(-1) of data. Extending the analysis to the hypothetical 100 TeV Very Large Hadron Collider (VLHC), 5s can be obtained for WR masses up to M-WR = 15(30) with approximately 100 fb(-1) (10 ab(-1)). Conversely, with 0.9(10)[150]fb(-1) of 13 TeV data, M-WR < 3(4)[5] TeV and (m(N)/M-WR) < 0.1 can be excluded at 95% C.L.; with 100 fb(-1) (2.5 ab(-1)) of 100 TeV data, M-WR < 22(33) TeV can be excluded.
- 出版日期2016-11-15
