Search for squarks and gluinos in final states with jets and missing transverse momentum using 139 fb$^{-1}$ of $\sqrt{s}$ =13 TeV $pp$ collision data with the ATLAS detector

TL;DR

This paper reports a search for supersymmetric particles, specifically squarks and gluinos, in proton-proton collision data at 13 TeV, setting new exclusion limits on their masses based on jets and missing transverse momentum signatures.

Contribution

First search using 139 fb$^{-1}$ of ATLAS data to set new mass exclusion limits for squarks and gluinos in R-parity-conserving models.

Findings

Gluino mass excluded up to 2.30 TeV

Squark mass excluded below 1.85 TeV

Extends previous supersymmetry exclusion limits

Abstract

A search for the supersymmetric partners of quarks and gluons (squarks and gluinos) in final states containing jets and missing transverse momentum, but no electrons or muons, is presented. The data used in this search were recorded by the ATLAS experiment in proton-proton collisions at a centre-of-mass energy of $\sqrt{s}$ = 13 TeV during Run 2 of the Large Hadron Collider, corresponding to an integrated luminosity of 139 fb$^{-1}$. The results are interpreted in the context of various $R$-parity-conserving models where squarks and gluinos are produced in pairs or in association and a neutralino is the lightest supersymmetric particle. An exclusion limit at the 95% confidence level on the mass of the gluino is set at 2.30 TeV for a simplified model containing only a gluino and the lightest neutralino, assuming the latter is massless. For a simplified model involving the strong production of mass-degenerate first- and second-generation squarks, squark masses below 1.85 TeV are excluded if the lightest neutralino is massless. These limits extend substantially beyond the region of supersymmetric parameter space excluded previously by similar searches with the ATLAS detector.