The compatibility of the LHC data with a scalar with a mass around 270 GeV and its possible connection to the X(750) excess

por Bruce Mellado (University of Wisconsin - Madison)

jueves 21 ene. 2016 9:30 → 10:30 Europe/Madrid

1001-Primera-1-1-1 - Paterna. Seminario (Universe)

The first run of the LHC saw the discovery of a Higgs boson, a particle that is consistent with the SM hypothesis. The field has been re-energized by an excess in the di-photon spectrum around 750 GeV reported by the ATLAS and CMS collaborations. In addition, there are a number of excesses in Run 1 ATLAS and CMS results, which can be interpreted as being due to the existence of heavy scalar particle. Using a minimalistic model, we can predict the kinematics of these final states and compare the prediction against data directly. A statistical combination of these results shows that a best fit point is found for a heavy scalar having a mass of 272⁺¹²_-9 GeV. This result has been quantified as a three-sigma effect. The possibility of embedding these excesses, into a 2HDM, with H(270) and A(750), and the phenomenological implications are discussed.