Abstract
The ATLAS collaboration has recently reported a 2.6 sigma excess in the search for a heavy resonance decaying into a pair of weak gauge bosons. Only fully hadronic final states are being looked for in the analysis. If the observed excess really originates from the gauge bosons' decays, other decay modes of the gauge bosons would inevitably leave a trace on other exotic searches. In this paper, we propose the use of the Z boson decay into a pair of neutrinos to test the excess. This decay leads to a very large missing energy and can be probed with conventional dark matter searches at the LHC. We discuss the current constraints from the dark matter searches and the prospects. We find that optimizing these searches may give a very robust probe of the resonance, even with the currently available data of the 8 TeV LHC.
Highlights
If we further assume that the φ’s are weak gauge bosons, signals from other exotic searches in addition to analyses mentioned above are expected, as the non-hadronic decays of the gauge bosons will lead to a variety of final states
We propose the use of the Z boson decay into a pair of neutrinos to test the excess
We focus on the decay Z → νν, which is the secondary decay mode of the Z boson
Summary
For both signal and background estimations, we have used the programs MADGRAPH 5 v2.1.2 [22, 23] interfaced to Pythia 6.4 [24] and Delphes 3 [25] (which has FastJet incorporated [26, 27]). For the case of X → W Z, we assume a W boson, which couples to SM particles in a similar way to the SM W boson In both cases, we assume that the total decay width of the resonance is 100 GeV. In order to study the prospect of the event searches’ optimizations, we need to estimate the number of the background events in optimized SRs characterized by the stronger MET cuts. The normalization factor is consistent within a few tens of percent, compared to the cross section estimated with MADGRAPH
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