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
Summary
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
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