Dark matter interpretations of ATLAS searches for the electroweak production of supersymmetric particles in s√=8 TeV proton-proton collisions

H. WAHLBERG Y ATLAS COLLABORATION

JOURNAL OF HIGH ENERGY PHYSICS - (Online)

SISSA

Año: 2016

1029-8479

A selection of searches by the ATLAS experiment at the LHC for the electroweak productionof SUSY particles are used to study their impact on the constraintson dark matter candidates.√The searches use 20 fb −1 of proton?proton collision data at s = 8 TeV. A likelihood-drivenscan of a five-dimensional effective model focusing on the gaugino?higgsino and Higgs sec-tor of the phenomenological minimal supersymmetric Standard Model is performed. Thisscan uses data from direct dark matter detection experiments, the relic dark matter densityand precision flavour physics results. Further constraints from the ATLAS Higgs mass meas-urement and SUSY searches at LEP are also applied. A subset of models selected from thisscan are used to assess the impact of the selected ATLAS searches in this five-dimensionalparameter space. These ATLAS searches substantially impact those models for which themass m( χ̃ 01 ) of the lightest neutralino is less than 65 GeV, excluding 86% of such models.The searches have limited impact on models with larger m( χ̃ 01 ) due to either heavy elec-troweakinos or compressed mass spectra where the mass splittings between the producedparticles and the lightest supersymmetric particle is small.