Abstract
A search for supersymmetric partners of gluons and quarks is presented, involving signatures with jets and either two isolated leptons (electrons or muons) with the same electric charge, or at least three isolated leptons. A data sample of proton-proton collisions at sqrt{s} = 13 TeV recorded with the ATLAS detector at the Large Hadron Collider between 2015 and 2018, corresponding to a total integrated luminosity of 139 fb−1, is used for the search. No significant excess over the Standard Model expectation is observed. The results are interpreted in simplified supersymmetric models featuring both R-parity conservation and R-parity violation, raising the exclusion limits beyond those of previous ATLAS searches to 1600 GeV for gluino masses and 750 GeV for bottom and top squark masses in these scenarios.
Highlights
The Signal regions (SRs) Rpv2L targets gluino pair production in R-parity-violating scenarios, without any ETmiss requirement. It is inclusive in terms of b-tagged jets to be sensitive to various decay modes of gluinos leading to final states with leptons and jets, such as the scenario illustrated in figure 1(d) or the few other examples mentioned in table 1
The SRs Rpc2L1b and Rpc2L2b overlap by approximately 15% in terms of expected yields from SM processes, and two data events satisfy the requirements for both regions
When ETmiss is relaxed (Rpc2L0b, Rpc2L2b), the meff requirement is loosened by the difference between the actual ETmiss and the minimum ETmiss required in the SR, to avoid selecting harder jets or leptons in the low-ETmiss region
Summary
The ATLAS experiment [5] at the LHC is a multipurpose particle detector with a forwardbackward symmetric cylindrical geometry and a near 4π coverage in solid angle. It consists of an inner tracking detector (ID) surrounded by a thin superconducting solenoid providing a 2 T axial magnetic field, electromagnetic (EM) and hadron calorimeters, and a muon spectrometer (MS). The ATLAS experiment [5] at the LHC is a multipurpose particle detector with a forwardbackward symmetric cylindrical geometry and a near 4π coverage in solid angle.. The ATLAS experiment [5] at the LHC is a multipurpose particle detector with a forwardbackward symmetric cylindrical geometry and a near 4π coverage in solid angle.2 It consists of an inner tracking detector (ID) surrounded by a thin superconducting solenoid providing a 2 T axial magnetic field, electromagnetic (EM) and hadron calorimeters, and a muon spectrometer (MS). The ID covers the pseudorapidity range |η| < 2.5 It consists of silicon pixel, silicon microstrip, and transition radiation tracking detectors, completed by the insertable B-layer (IBL) installed before Run 2 [31, 32]. A steel/scintillatortile hadron calorimeter covers the central pseudorapidity range |η| < 1.7. This is followed by a software-based trigger that reduces the accepted event rate to 1 kHz on average depending on the data-taking conditions
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