29 research outputs found
Search for supersymmetry in final states with two or three soft leptons and missing transverse momentum in proton-proton collisions at = 13 TeV
A search for supersymmetry in events with two or three low-momentum leptons
and missing transverse momentum is performed. The search uses proton-proton
collisions at = 13 TeV collected in the three-year period 2016-2018
by the CMS experiment at the LHC and corresponding to an integrated luminosity
of up to 137 fb. The data are found to be in agreement with expectations
from standard model processes. The results are interpreted in terms of
electroweakino and top squark pair production with a small mass difference
between the produced supersymmetric particles and the lightest neutralino. For
the electroweakino interpretation, two simplified models are used, a wino-bino
model and a higgsino model. Exclusion limits at 95% confidence level are set on
masses up to 275 GeV for a mass
difference of 10 GeV in the wino-bino case, and up to 205 (150) GeV for a mass
difference of 7.5 (3) GeV in the higgsino case. The results for the higgsino
are further interpreted using a phenomenological minimal supersymmetric
standard model, excluding the higgsino mass parameter up to 180 GeV with
the bino mass parameter at 800 GeV. In the top squark interpretation,
exclusion limits are set at top squark masses up to 540 GeV for four-body top
squark decays and up to 480 GeV for chargino-mediated decays with a mass
difference of 30 GeV.Comment: Submitted to JHEP. All figures and tables can be found at
http://cms-results.web.cern.ch/cms-results/public-results/publications/SUS-18-004
(CMS Public Pages