Supersymmetry searches in R-parity conserving supergravity inspired scenarios have been one of the highlights of the LHC program since its inception. In these scenarios, the Lighest Supersymmetric Particle (LSP) is supposed to be neutral, stable and weakly interacting, usually the lighest of the neutral gauginos / higgsinos (neutralinos), leading to the famous missing transverse momentum (MET) signature. The searches do not rely on explicit minimal-supergravity (mSUGRA) mass hierarchies: when possible loose requirements on the mass spectrum are applied.
Here, pair production of colored SUSY particles (gluinos and/or squarks) that decay to quarks and missing transverse momentum is investigated. This final state has the highest mass reach but other final states are covered by other ATLAS analyses, like lepton(s)+jets+MET, dedicated b-jets+MET, dedicated searches for stop pair production and for gaugino production.
The search is based on kinematic cuts and separation in several topologies based on the number of jets. In addition to the signal rich regions, control regions for the main background sources are built which allows for a simultaneous fit for signal and background levels.
The Run 2 results with 36fb-1 are available from the ATLAS web site . The increased centre-of-mass energy allowed to exceed Run 1 exclusions despite the limited integrated luminosity.
- The Final Run 1 results are available on the ATLAS web or as JHEP09(2014)176, no indication of signal was found and limits were placed on various models, e.g. here in mSUGRA
- Publication based on 2011 data
- Publication based on 2010 data
Group members : Baptiste Abeloos (former PHD student), Christina Agapopoulos (PhD student), Laurent Duflot (staff), Nikola Makovec (staff), François Niedercorn (former PhD student)