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

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 $$ \sqrt{s} $$ 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.

The tiny (g-2) muon wobble from small-μ supersymmetry

“…In general, the supersymmetric partners of the colorcharged particles must have masses of the order of a few TeV to satisfy current experimental bounds (see, for instance, refs. [136][137][138][139]). Note that in some of our benchmark scenarios, the hierarchy between the gluino and the weak gaugino masses is larger than the hierarchy induced by the running of the gaugino masses from (approximately) universal values at the Grand Unification scale.…”

Baryogenesis via relativistic bubble walls

“…From the recent squark or gluino bounds in the LHC e.g. [95,96], we expect a mass bound of ∼ 2 TeV on the lightest colored particle.…”

Exploring jet substructure in semi-visible jets

“…In experimental searches, this is typically accounted for by removing jets when the angular separation of jets and missing transverse momentum direction is less than ∆φ < 0.4. For a signature like this, that requirement is clearly unusable, but events where jet areas include dead calorimeter cells can be discarded, and in ATLAS this is seen to be a small fraction of events [17].…”