Wuppertal 2015 – scientific programme

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T: Fachverband Teilchenphysik

T 32: Jenseits des Standardmodells 1 (Theorie)

T 32.3: Talk

Monday, March 9, 2015, 17:15–17:30, K.12.23 (K1)

Limits and Fits from Simplified Models — Lisa Edelhäuser¹, Jan Heisig¹, Michael Krämer¹, Lennart Oymanns¹, •Jory Sonneveld¹, and Wolfgang Waltenberger² — ¹Institute for Theoretical Particle Physics and Cosmology, RWTH Aachen, Germany — ²HEPHY Institute for High Energy Physics, Vienna, Austria

With new results and limits on constrained models of supersymmetry (SUSY) from the ATLAS and CMS collaborations at the LHC, questions arise about what these limits imply for more general models of SUSY or other models for physics beyond the Standard Model. Since SUSY has a vast array of parameters, both collaborations also quantify their search results in terms of simplified models, augmenting the particle spectrum of the standard model with only a very limited set of new, hypothetical particles.

In our work presented here, we focus on all-hadronic (multijet plus missing transverse energy) searches at the LHC and test the usability of simplified models parametrized by the squark and lightest SUSY particle (LSP) masses. By comparing results of these simplified models to more realistic models of squark production, we show that despite some underlying differences it is possible to use simplified models to estimate limits on both SUSY and same-spin BSM models. We also find good agreement between our results and those of SModelS, a tool for interpreting simplified model LHC results. Finally, we use simplified models for fits of supersymmetric models.