Abstract
A search for strongly produced supersymmetric particles is conducted using signatures involving multiple energetic jets and either two isolated leptons (e or mu ) with the same electric charge or at least three isolated leptons. The search also utilises b-tagged jets, missing transverse momentum and other observables to extend its sensitivity. The analysis uses a data sample of proton–proton collisions at sqrt{s}= 13 TeV recorded with the ATLAS detector at the Large Hadron Collider in 2015 corresponding to a total integrated luminosity of 3.2 fb^{-1}. No significant excess over the Standard Model expectation is observed. The results are interpreted in several simplified supersymmetric models and extend the exclusion limits from previous searches. In the context of exclusive production and simplified decay modes, gluino masses are excluded at 95,% confidence level up to 1.1–1.3 TeV for light neutralinos (depending on the decay channel), and bottom squark masses are also excluded up to 540 GeV. In the former scenarios, neutralino masses are also excluded up to 550–850 GeV for gluino masses around 1 TeV.
Highlights
Supersymmetry (SUSY) [1,2,3,4,5,6] is one of the most studied frameworks to extend the Standard Model (SM) beyond the electroweak scale; a general review can be found in Ref. [7]
This paper presents a search for SUSY in final states with two leptons of the same electric charge (referred to as same-sign (SS) leptons) [22] or three leptons (3L) in any charge combination, jets and missing transverse momentum
Samples of ttV and ttW W production are generated at LO with MadGraph v2.2.2 [38] interfaced to the Pythia 8.186 [39] parton shower model, with up to two, one or no extra partons included in the matrix element; they are described in detail in Ref. [40]
Summary
Supersymmetry (SUSY) [1,2,3,4,5,6] is one of the most studied frameworks to extend the Standard Model (SM) beyond the electroweak scale; a general review can be found in Ref. [7]. In order to address the SM hierarchy problem with SUSY models [13,14,15,16], TeV-scale masses are required [17,18] for the partners of the gluons (gluinos g) and of the top quark chiral degrees of freedom (top squarks tL and tR), due to the large top Yukawa coupling. The latter favours significant tL–tR mixing, so that the lighter mass eigenstate t1 is in many scenarios lighter than the other squarks [19,20].
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