ATLAS HDBS and Exotic physics analysis groups workshop at Napoli, Italy was a big success!

A logo design for ATLAS HDBS (Higgs and Diboson Searches) physics analysis group: Herrison, which is French word for hedgehog, and close to the word of Higgs boson (H***son). The meaning stands for the searches of all these groups are strongly related to the Higgs boson discovered in 2012 at LHC. Physicsists believe that the Higgs boson will be a portal to the new physics. In the logo, the little hedgehog is trying to move the "H", as searching hidden secrets beneath the Standard-Model Higgs boson.

This note presents the most recent summary plots summarizing the results of the exotic Higgs decay searches from ATLAS HBSM Working Group. This is the first summary reports of low mass exotic Higgs decay searches from ATLAS. With more data being analyzed in Run2 of LHC, more results will be updated soon.

The searches for Higgs boson decays to beyond-the-Standard-Model light bosons in four-lepton events with the ATLAS detector (arxiv:1802.03388) is published. Searches are perfomed for exotic decays of the Standard Model Higgs boson with a mass of 125 GeV to one or two new spin-1 particles, H→ZZd nd H→ZdZd, or spin-0 particles, H→Za and H→aa, using proton-proton collision data produced at center of mass energy at 13 TeV and recoreded by the ATLAS detector at the LHC in 2015 and 2016. The data are found to be globally consistent with the Standard-Model.