Abstract
The results of a search for gluinos in final states with an isolated electron or muon, multiple jets and large missing transverse momentum using proton–proton collision data at a centre-of-mass energy of sqrt{s} = 13 mathrm{{ Te V}} are presented. The dataset used was recorded in 2015 by the ATLAS experiment at the Large Hadron Collider and corresponds to an integrated luminosity of 3.2 fb^{-1}. Six signal selections are defined that best exploit the signal characteristics. The data agree with the Standard Model background expectation in all six signal selections, and the largest deviation is a 2.1 standard deviation excess. The results are interpreted in a simplified model where pair-produced gluinos decay via the lightest chargino to the lightest neutralino. In this model, gluinos are excluded up to masses of approximately 1.6 Te V depending on the mass spectrum of the simplified model, thus surpassing the limits of previous searches.
Highlights
In R-parity-conserving SUSY [13], gluinos might be pairproduced at the Large Hadron Collider (LHC) via the strong interaction and decay either directly or via intermediate states to the lightest supersymmetric particle (LSP)
The analysis uses 3.2 fb−1of proton–proton co√llision data collected by the ATLAS experiment in 2015 at s = 13 TeV at the LHC
Six signal regions requiring at least two to six jets are used to cover a broad spectrum of the targeted SUSY model parameter space
Summary
In R-parity-conserving SUSY [13], gluinos might be pairproduced at the Large Hadron Collider (LHC) via the strong interaction and decay either directly or via intermediate states to the lightest supersymmetric particle (LSP). This paper considers a SUSY-inspired model where pairproduced gluinos decay via the lightest chargino (χ1±) to the LSP, which is assumed to be the lightest neutralino (χ10). The two sets target SUSY models with small and large mass differences between the predicted supersymmetric particles, respectively. The analysis extends previous ATLAS searches with similar event selections [16] which were performed with data collected during the first data-taking campaign between 2010. The CMS Collaboration has performed similar searches for gluinos with decays via intermediate supersymmetric particles in Run 1 [18,19] and Run 2 [20].
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