Search for supersymmetric particles in gluino-gluino pair production events at CMS

A search for gluino pair production with events using 35.9 fb$^{-1}$ of data from pp collisions at a center-of-mass energy of 13 TeV in 2016 is presented. Two different cascade decay modes of gluinos are considered, and separate analyses for each of the models are performed. The first model describes gluino pair production, where each gluino decays to a top quark-antiquark pair and the lightest SUSY particle. The final state contain an isolated lepton, b-tagged jets along with other jets and large missing transverse momentum. The azimuthal angle between the lepton and the W boson flight direction is used to suppress the background. The search is performed in exclusive search bins which differ in the number of jets, b-tagged jets, scalar sum of all jet transverse momenta and scalar sum of the scalar sum of the transverse missing momentum and transverse momentum of the lepton. The second model targets gluino decays to a chargino that is nearly mass degenerate with the lightest SUSY particle, a neutralino, and therefore long-lived. The final state consists of a disappearing track, multiple jets, and large missing transverse energy. Event variables are constructed based on the topology of the final state for defining search regions and facilitating background estimation. No significant deviation from the predicted Standard Model background is observed. The results are interpreted in terms of simplified models, resulting in the exclusion limits of particular gluino-neutralino mass configuration. The largest excluded gluino mass is $m$$\widetilde{g}$ = 2050 GeV, whereas the largest excluded neutralino mass is $m$$_{x1}^{-0}$ = GeV.