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Probing bb production with the ATLAS detector at the LHC

Davison, PR; (2016) Probing bb production with the ATLAS detector at the LHC. Doctoral thesis , UCL (University College London). Green open access

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Abstract

This thesis describes the measurement of b b production with two different techniques, both using the ATLAS detector at the LHC. Firstly Z + b b events are measured using 7 TeV data collected in 2011. The Z-boson was reconstructed using pairs of leptons, with the b-jets used to tag the presence of B-hadrons. The cross-section was measured as a function of four variables and compared to theoretical predictions. NLO predictions from MCFM and aMC@NLO best reproduce the data with a discrepancy seen at low angular separation of the b-jets. Secondly inclusive b b production is probed using the decay of B-hadrons to muons using the 8 TeV data collected by ATLAS in 2012. Differential cross-sections were measured as a function of six variables and compared to predictions from Pythia8 and Herwig++. In general the shape of data was well reproduced by the Herwig++ prediction.

Type: Thesis (Doctoral)
Title: Probing bb production with the ATLAS detector at the LHC
Event: UCL (University College London)
Open access status: An open access version is available from UCL Discovery
Language: English
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/1475683
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