Abstract

Abstract A search is presented for new particles decaying to large numbers (7 or more) of jets, with missing transverse momentum and no isolated electrons or muons. This analysis uses 20.3 fb−1 of pp collision data at $ \sqrt{s}=8 $ TeV collected by the ATLAS experiment at the Large Hadron Collider. The sensitivity of the search is enhanced by considering the number of b-tagged jets and the scalar sum of masses of large-radius jets in an event. No evidence is found for physics beyond the Standard Model. The results are interpreted in the context of various simplified supersymmetry-inspired models where gluinos are pair produced, as well as an mSUGRA/CMSSM model.

Highlights

  • A search is presented for new particles decaying to large numbers (7 or more) of jets, with missing transverse momentum and no isolated electrons or muons

  • The results are interpreted in the context of various simplified supersymmetry-inspired models where gluinos are pair produced, as well as an mSUGRA/CMSSM model

  • The analysis presented in this paper extends previous analyses by reaching higher jet multiplicities and utilizing new sensitive variables

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Summary

Summary of signal regions

The nineteen resulting signal regions are summarized in table 1. Stream 0.4 jets has six inclusive signal with pT > 50 GeV, MJΣ regions; for > 420 GeV aenxdamEpTmliessa/n√HevTen>t which has at 4 GeV1/2 will least ten be found in all six multi-jet + MJΣ regions. Two background categories are considered in this search: (1) multi-jet production, including purely strong interaction processes and fully hadronic decays of tt, and hadronic decays of W and Z bosons in association with jets, and (2) processes with leptons in the final states, collectively referred to as leptonic backgrounds. The methods used in the determination of the multi-jet and leptonic backgrounds are described in sections 5.2 and 5.4, respectively

Monte Carlo simulations
Multi-jet background
Systematic uncertainties in the multi-jet background determination
Leptonic backgrounds
Systematic uncertainties in the leptonic background determination
Fit results
Conclusion
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