Abstract
A data sample of events from proton-proton collisions with at least two jets, and two isolated same-sign or three or more charged leptons, is studied in a search for signatures of new physics phenomena. The data correspond to an integrated luminosity of 137{,{text {fb}}^{-1}} at a center-of-mass energy of 13,{text {TeV}} , collected in 2016–2018 by the CMS experiment at the LHC. The search is performed using a total of 168 signal regions defined using several kinematic variables. The properties of the events are found to be consistent with the expectations from standard model processes. Exclusion limits at 95% confidence level are set on cross sections for the pair production of gluinos or squarks for various decay scenarios in the context of supersymmetric models conserving or violating R parity. The observed lower mass limits are as large as 2.1,{text {TeV}} for gluinos and 0.9,{text {TeV}} for top and bottom squarks. To facilitate reinterpretations, model-independent limits are provided in a set of simplified signal regions.
Highlights
In the standard model (SM), the production of multiple jets in conjunction with two same-sign (SS) or three or more charged leptons is a very rare process in proton-proton collisions
The hard scattering process of the dominant backgrounds estimated from simulation is simulated with the MadGraph5_amc@nlo 2.2.2 (2.4.2) [27,28,29] generator for 2016 (2017 and 2018) conditions
The energy of charged hadrons is determined from a combination of their momentum measured in the tracker and the matching electromagnetic calorimeter (ECAL) and hadron calorimeter (HCAL) energy deposits, corrected for the response function of the calorimeters to hadronic showers
Summary
In the standard model (SM), the production of multiple jets in conjunction with two same-sign (SS) or three or more charged leptons is a very rare process in proton-proton (pp) collisions. For many SUSY models, the SS and multilepton signatures provide complementarity with searches in the zero- or one-lepton final states, and they are suitable for probing compressed mass spectra and other scenarios involving low-momentum leptons or low missing transverse momentum. Both the ATLAS [23] and CMS [24,25] Collaborations have carried out searches in these channels using LHC data collected up to and including.
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