ATLAS releases a search for axion-like particles in Higgs boson decays
Figg 1: upper limits for the branching ratio of Higgs to axion-like particles
ATLAS has recently released an axion-like particle search in Higgs boson decays. The Higgs boson decays to a Z boson and an axion-like particle that subsequently decays to a boosted pair of photons. This is the first time this particular decay mode is searched for in ATLAS. All the main contributors of this search are from Liverpool: Dr Cristiano Sebastiani, Dr Nikolaos Rompotis as well as our recent graduate Dr Adam Ruby whose PhD thesis topic was this final state.
More information:
https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HDBS-2019-09/
Fig 2: limits on the axion-like particle parameter space from this search in comparison to other searches