Search for gluinos in events with an isolated lepton, jets and missing transverse momentum at $\sqrt{s}$ = 13 TeV with the ATLAS detector

TL;DR

This paper reports a search for gluinos in proton-proton collisions at 13 TeV using the ATLAS detector, finding no significant excess over the Standard Model and setting new mass exclusion limits up to 1.6 TeV.

Contribution

First search for gluinos with this specific final state at 13 TeV, setting new exclusion limits that surpass previous results.

Findings

No significant excess observed, largest deviation is 2.1 sigma.

Gluinos are excluded up to about 1.6 TeV in the simplified model.

Results improve upon previous search limits.

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 TeV 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 TeV depending on the mass spectrum of the simplified model, thus surpassing the limits of previous searches.