McClymont, Laurie Iain; (2018) Searches for new physics using pairs of jets containing b-quarks at the ATLAS detector. Doctoral thesis (Ph.D), UCL (University College London).

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Abstract

Two searches for Beyond Standard Model resonances are performed using 13 TeV proton–proton collision data collected by the ATLAS detector in 2015 and 2016 using the invariant mass distribution of pairs of jets, where at least one or both jets are identified as containing a b-quark. The searches are sensitive to resonances decaying to a pair of b-quarks or a b-quark and a gluon. A high-mass search probes the mass region 1.4 – 6 TeV using a data-set corresponding to an integrated luminosity of 13.3 fb⁻¹. A low-mass search utilises real-time b-jet identification to probe the mass region 0.6 – 1.5 TeV using a data- set corresponding to an integrated luminosity of 24.3 fb⁻¹. No evidence of a resonance is found. Excited b∗ quarks with masses from 1.4 to 2.3 TeV and a set of Z′ boson models with masses from 0.6 to 1.25 TeV or at 1.5 TeV are excluded at the 95% credibility-level. In addition, 95% credibility-level upper limits are set on generic signals with a Gaussian distribution in the mass range 0.65 – 6 TeV.

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