Boosted b¯b decays with the ATLAS experiment at the LHC

A measurement and a search, both involving high transverse momentum bosons decaying to b-quarks, are performed using a dataset of proton-proton collisions at √ s = 8 TeV, collected in 2012 with the ATLAS detector at the LHC, corresponding to an integrated luminosity of 19.5 fb−1. The production cross section of Z → b¯b is measured, where the Z boson has high transverse momentum. The measured value of the fiducial cross section is found to be in good agreement with next-to-leading-order Standard Model predictions. A search is made for TeV-scale resonances decaying via a pair of Higgs bosons to the b¯bb¯b final state. The graviton excitation, G∗, in the bulk Randall-Sundrum model is used as a baseline signal model. No evidence of a resonance is found. Upper limits are set on σ(pp→G∗) × BR(G∗→HH→b¯bb¯b).