PRECISION CALCULATIONS IN SINGLET EXTENSIONS OF THE STANDARD MODEL

by Guillaune Chalons (LPT Orsay)

Tuesday 7 Feb 2017, 14:00 → 15:00 Europe/Paris

Grand Amphi (LPSC)

Since the discovery of the (a?) Higgs boson, a lot of efforts have been devoted to decipher its properties. Although the scalar boson discovered at the LHC looks like more and more like the Standard Model (SM) Higgs boson, the current experimental precision still allows for the existence of New Physics which could modify its properties. In the next runs of the LHC (in particular during the HL-LHC period) the experimental precision on the couplings of the Higgs will reach an accuracy that will also demand very precise SM but also Beyond-Standard-Model (BSM) theoretical predictions, in order to compare unambiguously with the data and detect deviations from the SM. In particular, the experimental precision will be such that EW corrections in BSM predictions for the phenomenology of the Higgs will be relevant to reach the desired accuracy. The computation of EW corrections require the full renormalization of the model considered, a task which needs to be automatized considering the complexity and subtlety of BSM models. I will therefore present the SloopS code, an automatic code for one-loop calculations in the SM and BSM paradigms. I will focus on models where the Higgs potential is extended with a least one singlet field under the SM gauge group and present precise predictions for Higgs decays obtained with SloopS. Such models possess some virtues, like providing a candidate for Dark Matter and/or a successful electroweak baryogenesis. These models also serve as benchmarks for Higgs searches at the LHC, motivating again the need for precise theoretical predictions to interpret the data efficiently. In addition, they can also enhance significantly the Higgs pair production at the LHC, which will be actively searched for in the next phases of the LHC, and electroweak corrections can play a dominant role in this enhancement.

Slides chalons_sloops.pdf