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Search for single production of a Vector-Like partner of the bottom quark in the bH(bb) final state in pp collisions at √s = 13 TeV with the ATLAS detector

Montella, Marco; (2021) Search for single production of a Vector-Like partner of the bottom quark in the bH(bb) final state in pp collisions at √s = 13 TeV with the ATLAS detector. Doctoral thesis (Ph.D), UCL (University College London). Green open access

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Abstract

A search is presented for single-produced vector-like B quark decaying to a Standard Model b-quark and a Higgs boson, itself decaying into a b-quark pair. The B decay system is reconstructed as an association of a large-radius jet and a small-radius jet, respectively taken to reflect the secondary Higgs decay system and the $b$ quark produced in the immediate resonance decay. The search is the first at ATLAS to probe the Higgs to b-quark pair final state in Run-2, and aims at extending the region of the M(B) phase space the current exclusion limits, set by the pair production combination search at 1220 GeV for a Vector-Like B quark occurring as an isospin singlet. For this purpose, a newly designed and optimised event selection was implemented for maximal sensitivity in the 1000-2000 GeV invariant mass region, and a particular effort was dedicated in researching and implementing data-driven modelling techniques to provide a reliable estimation of the main, QCD-Driven, background source to the search. A binned likelihood fit is set up for the statistical interpretation of the results, which are presented in the form of mass- and coupling-dependent 95% CLs exclusion limits on the production cross section of a VLQ-like signal.

Type: Thesis (Doctoral)
Qualification: Ph.D
Title: Search for single production of a Vector-Like partner of the bottom quark in the bH(bb) final state in pp collisions at √s = 13 TeV with the ATLAS detector
Event: UCL (University College London)
Open access status: An open access version is available from UCL Discovery
Language: English
Additional information: Copyright © The Author 2020. Original content in this thesis is licensed under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) Licence (https://creativecommons.org/licenses/by/4.0/). Any third-party copyright material present remains the property of its respective owner(s) and is licensed under its existing terms. Access may initially be restricted at the author’s request.
UCL classification: UCL
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/10120222
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