Lambourne, L; (2014) Boosted bb decays with the ATLAS experiment at the LHC. Doctoral thesis , UCL (University College London).

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Abstract

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 inverse fb. The production cross section of Z → bb 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*) x BR(G*→HH→bbbb).

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