KIT | KIT-Bibliothek | Impressum

Singlet extensions of the standard model at LHC Run 2: benchmarks and comparison with the NMSSM

Costa, R.; Mühlleitner, M.; Sampaio, M.O.P.; Santos, R.

Abstract (englisch): The Complex singlet extension of the Standard Model (CxSM) is the simplest extension that provides scenarios for Higgs pair production with different masses. The model has two interesting phases: the dark matter phase, with a Standard Model-like Higgs boson, a new scalar and a dark matter candidate; and the broken phase, with all three neutral scalars mixing. In the latter phase Higgs decays into a pair of two different Higgs bosons are possible. In this study we analyse Higgs-to-Higgs decays in the framework of singlet extensions of the Standard Model (SM), with focus on the CxSM. After demonstrating that scenarios with large rates for such chain decays are possible we perform a comparison between the NMSSM and the CxSM. We find that, based on Higgs-to-Higgs decays, the only possibility to distinguish the two models at the LHC run 2 is through final states with two different scalars. This conclusion builds a strong case for searches for final states with two different scalars at the LHC run 2. Finally, we propose a set of benchmark points for the real and complex singlet extensions to be tested at the LHC run 2. They have been chosen such that the discovery prospects of the involved scalars are maximised and they fulfil the dark matter constraints. Furthermore, for some of the points the theory is stable up to high energy scales. For the computation of the decay widths and branching ratios we developed the Fortran code sHDECAY, which is based on the implementation of the real and complex singlet extensions of the SM in HDECAY. © 2016, The Author(s).

Zugehörige Institution(en) am KIT Institut für Theoretische Physik (ITP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2016
Sprache Englisch
Identifikator DOI: 10.1007/JHEP06(2016)034
ISSN: 1029-8479, 1126-6708
URN: urn:nbn:de:swb:90-566051
KITopen ID: 1000056605
Erschienen in Journal of high energy physics
Band 2016
Heft 6
Seiten Article 34
Bemerkung zur Veröffentlichung Gefördert durch SCOAP3
Schlagworte Beyond Standard Model; Higgs Physics
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft KITopen Landing Page