Search for squarks and gluinos in final states with one 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 and squarks in proton-proton collisions at 13 TeV using the ATLAS detector, finding no excess and setting mass exclusion limits up to 2.2 TeV for gluinos.

Contribution

First search for squarks and gluinos decaying via charginos into a single lepton, jets, and missing energy at 13 TeV with ATLAS, setting new mass exclusion limits.

Findings

No significant excess over Standard Model expectations.

Excluded gluino masses up to 2.2 TeV.

Excluded squark masses up to 1.4 TeV.

Abstract

The results of a search for gluino and squark pair production with the pairs decaying via the lightest charginos into a final state consisting of two $W$ bosons, the lightest neutralinos ($\tilde\chi^0_1$), and quarks, are presented. The signal is characterised by the presence of a single charged lepton ($e^{\pm}$ or $\mu^{\pm}$) from a $W$ boson decay, jets, and missing transverse momentum. The analysis is performed using 139 fb$^{-1}$ of proton-proton collision data taken at a centre-of-mass energy $\sqrt{s}=13$ TeV delivered by the Large Hadron Collider and recorded by the ATLAS experiment. No statistically significant excess of events above the Standard Model expectation is found. Limits are set on the direct production of squarks and gluinos in simplified models. Masses of gluino (squark) up to 2.2 TeV (1.4 TeV) are excluded at 95% confidence level for a light $\tilde\chi^0_1$.