Mainz 2014 – scientific programme

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T: Fachverband Teilchenphysik

T 77: Jenseits des Standardmodells (Theorie) 2

T 77.5: Talk

Wednesday, March 26, 2014, 17:45–18:00, P6

Distinction between NMSSM and MSSM in challenging scenarios at LHC and ILC — •Stefano Porto¹, Gudrid Moortgat-Pick^1,2, and Krzysztof Rolbiecki³ — ¹Universität Hamburg, Germany — ²DESY, Hamburg, Germany — ³Universidad Autonoma de Madrid, Spain

Supersymmetry offers appealing answers to several Standard Model shortcomings, such as Dark Matter origin, Naturalness, gauge coupling unification. In case of discovery of supersymmetric particles at colliders, the challenge would then be to understand the underlying supersymmetric realization that describes the observed new physics. After the Higgs discovery at the LHC, constrained and simplified SUSY models are under pressure. However, both minimal supersymmetric Standard Model (MSSM) and next-to-minimal supersymmetric Standard Model (NMSSM) offer large regions in the parameter space to be explored. It is therefore essential to find strategies to discriminate between these two models. In fact, they can lead to similar Higgs sectors that are hardly distinguishable both at the LHC and at the ILC and very close lower supersymmetric mass spectra. We study the tricky possibility of detecting only the lightest neutralinos and chargino that can be ascribed both to the MSSM and the NMSSM. We develop discrimination tools that exploit the power of polarised beams at the ILC in an interplay with the higher energies reached at the LHC. Applying SUSY parameter determination fits together with polarization techniques, we highlight neutralino gauge eigenstate admixtures, that are generally different between the two models, enabling their distinction.