NLO corrections to Neutralino decays: determining parameters of the complex MSSM at the LHC

par Aoife Bharucha (Universität Hamburg)

jeudi 29 nov. 2012, 11:00 → 12:00 Europe/Paris

Auditorium Vivargent (Annecy-le-Vieux)

Searches for the production of Dark Matter (DM) and analyses of the Higgs boson are currently being performed at the LHC. In order to determine the underlying model, it is crucial to measure the masses and couplings of Higgs and DM particles precisely. If supersymmetry is realised in nature, the lightest SUSY particle (LSP) is a possible candidate for DM. An interesting production mechanism for the Higgs and the LSP is the decay of heavier SUSY particles. Measuring these decays to high accuracy will provide important information on the Higgs and DM. I will present NLO predictions for the decays of neutralinos in the Minimal Supersymmetric Standard Model (MSSM) with complex parameters. A few subtleties arise in connection to the on-shell renormalisation of the electroweakino sector, particularly in relation to renormalisation of the CP violating phases, and I will briefly discuss these. I will finally describe how we may be able to learn about parameters of the complex MSSM at the LHC via direct gaugino production, and present some preliminary results.

Slides AoifeAnnecy.pdf