Two Higgs bosons are better than one? di-Higgs studies at CMS

par M. Olivier Bondu (CERN)

vendredi 13 févr. 2015, 14:00 → 15:00 Europe/Paris

The study in the LHC-Run I data of the Higgs boson discovered by the ATLAS and CMS collaborations in July 2012 at a mass of 125 GeV indicates that its properties (spin-parity, couplings) are extremely similar to the Higgs boson as predicted by the Standard Model (SM). Yet, there are still many open fundamental questions (dark matter, hierarchy problem, matter-antimatter asymmetry...) that require physics beyond the SM. The possibility exists that this Higgs boson acts as a portal for beyond the SM physics: constraining the newly discovered Higgs sector with LHC data is a priority. In this context, study of final states containing two Higgs boson are extremely important: resonant production of two Higgs bosons would be a direct proof of exotic or super-symmetric physics, while the characterisation of non-resonant production constrains effective models that predicts deviation from SM predictions, and in particular the Higgs self-coupling. This seminar will present the lively state of the art of di-Higgs studies performed in the CMS collaboration: an overview of the current and planned LHC-Run I results (8 TeV, 20 fb-1) will be presented, as well as the prospectives for the HL-LHC machine (14 TeV, 3000 fb-1). The LHC-Run II planned results should help complement the picture in the very near future, in particular via the access to the vector boson fusion production mode.