Search for strong production of supersymmetric particles in final states with missing transverse momentum and at least three b-jets at $\sqrt{s} =$ 8 TeV proton-proton collisions with the ATLAS detector

TL;DR

This paper reports a search for supersymmetric particles in proton-proton collisions at 8 TeV using the ATLAS detector, focusing on events with multiple b-jets and missing transverse momentum, but finds no evidence of new physics.

Contribution

It presents the first ATLAS search targeting strong production of supersymmetric particles with at least three b-jets at 8 TeV, setting new exclusion limits up to 1340 GeV for gluino masses.

Findings

No excess over Standard Model predictions observed.

Gluino masses up to 1340 GeV are excluded.

Results extend previous limits significantly.

Abstract

This paper reports the results of a search for strong production of supersymmetric particles in 20.1 fb$^{-1}$ of proton-proton collisions at a centre-of-mass energy of 8 TeV using the ATLAS detector at the LHC. The search is performed separately in events with either zero or at least one high $p_\mathrm{T}$ lepton (electron or muon), large missing transverse momentum, high jet multiplicity and at least three jets identified as originated from the fragmentation of a b-quark. No excess is observed with respect to the Standard Model predictions. The results are interpreted in the context of several supersymmetric models involving gluinos and scalar top and bottom quarks, as well as a mSUGRA/CMSSM model. Gluino masses up to 1340 GeV are excluded, depending on the model, significantly extending the previous ATLAS limits.