Search for new phenomena in final states with large jet multiplicities and missing transverse momentum at sqrt(s)=8 TeV proton-proton collisions using the ATLAS experiment

TL;DR

This paper reports a search for new particles producing high jet multiplicities and missing transverse momentum in proton-proton collisions at 8 TeV, using ATLAS data, with no evidence found for physics beyond the Standard Model.

Contribution

It introduces a novel analysis considering b-tagged jets and jet mass sums to enhance sensitivity in high jet multiplicity events.

Findings

No evidence of new physics was observed.

Results constrain supersymmetry-inspired models.

Analysis techniques improve detection sensitivity.

Abstract

A search is presented for new particles decaying to large numbers (7 to greater or equal to 10) of jets, missing transverse momentum and no isolated electrons or muons. This analysis uses 20.3/fb 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 a mSUGRA/CMSSM model.