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 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 (1.4 ) are excluded at 95% confidence level for a light tilde{chi }^0_1.
Highlights
The Standard Model (SM) has proven to be a very successful theory
The results presented in this paper are based on the ATLAS data collected in proton–proton collisions at the Large Hadron Collider (LHC) during 2015–2018 at a centre-of-mass energy of 13, corresponding to an integrated luminosity of 139 fb−1
An exception is made for the 4J case in the meff > 1600 GeV region, where for each of the ttand single-top backgrounds the same normalisation factor is used across the two meff bins due to the low statistics in the highest meff bin
Summary
The Standard Model (SM) has proven to be a very successful theory. The discovery of the Higgs boson boson [1,2,3,4] by the ATLAS and CMS collaborations confirmed the predicted electroweak symmetry breaking, and highlighted the hierarchy problem [5,6,7,8]. This paper targets two simplified SUSY models [20,21] describing gluino and first two generation squark (u L , dL , cL , sL ) production processes and decays. In the models, referred to as the gluino and squark one-step models, gluinos or squarks are produced in pairs: gluinos subsequently quarks, In both models, the branching fractions for SUSY particles are assumed to be 100% for the aforementioned processes squark/gluino decay into χ1± and quarks, and χ1± → χ10W ±. Similar searches for gluinos and squarks with decays via intermediate supersymmetric particles were performed by the CMS Collaboration [24,25]
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