A new LHC Run 1 search for di-Higgs resonances in the 4b decay channel has now been submitted to Eur. Phys. J. C, see http://arxiv.org/abs/1506.00285. The data sample corresponds to about 20 inverse femtobarns of proton-proton collisions collected by the ATLAS detector in 2012 at a collision energy of 8 TeV. Prof. Willocq and postdoctoral Research Associate Bellomo had responsibility for the statistical analysis and editing of the paper for the so-called boosted analysis. This boosted analysis features the first application of b-tagging to track-jets associated with large-radius jets in ATLAS. Such a novel approach is required for tagging of high-momentum Higgs bosons decaying in the dominant bbbar mode and is expected to have broad application in searches involving Higgs bosons in Run 2 of the LHC.

See the mass distribution for pairs of large-radius jets (figure on the right) with dashed curves showing the expected deviations in the presence of Kaluza-Klein excitations of the graviton, as predicted by the Randall-Sundrum model with one warped extra spatial dimension. Interpretations were also made in the context of Two-Higgs Doublet models.

For more information, see https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2014-11/.