Abstract
A search for the electroweak production of charginos and sleptons decaying into final states with two electrons or muons is presented. The analysis is based on 139 fb^{-1} of proton–proton collisions recorded by the ATLAS detector at the Large Hadron Collider at sqrt{s}=13 text {TeV}. Three R-parity-conserving scenarios where the lightest neutralino is the lightest supersymmetric particle are considered: the production of chargino pairs with decays via either W bosons or sleptons, and the direct production of slepton pairs. The analysis is optimised for the first of these scenarios, but the results are also interpreted in the others. No significant deviations from the Standard Model expectations are observed and limits at 95% confidence level are set on the masses of relevant supersymmetric particles in each of the scenarios. For a massless lightest neutralino, masses up to 420 text {Ge}text {V} are excluded for the production of the lightest-chargino pairs assuming W-boson-mediated decays and up to 1 text {TeV} for slepton-mediated decays, whereas for slepton-pair production masses up to 700 text {Ge}text {V} are excluded assuming three generations of mass-degenerate sleptons.
Highlights
SUSY scenariosThe design of the analysis and the interpretation of results are based on simplified models [32], where the masses of relevant sparticles (in this case the χ1±, ̃, νand χ10) are the only free parameters
Background estimation and validationThe SM backgrounds can be classified into irreducible backgrounds, from processes with prompt leptons, and reducible backgrounds, which contain one or more FNP leptons
This paper presents a search for the electroweak production of charginos and sleptons decaying into final states with two charged leptons using 139 fb−1 of proton–proton colli√sion data recorded by the ATLAS detector at the LHC at s = 13 TeV
Summary
The design of the analysis and the interpretation of results are based on simplified models [32], where the masses of relevant sparticles (in this case the χ1±, ̃, νand χ10) are the only free parameters. The second decay mode proceeds via a slepton–neutrino/sneutrino–lepton pair (Fig. 1b). In this case it is assumed that the scalar partners of the left-handed charged leptons and neutrinos are light and accessible in the sparticle decay chains. It is assumed they are mass-degenerate, and their masses are chosen to be midway between the mass of the chargino and that of the χ10, which is pure bino. Eand μare considered in these models, and different assumptions about the masses of the superpartners of the left-handed and right-handed charged leptons, eL, eR, μ L and μ R, are considered
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