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Sensitivity of the first ATLAS measurement of the CKM matrix element Vcb
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Vladimirov, Vangelis (2022) Sensitivity of the first ATLAS measurement of the CKM matrix element Vcb. PhD thesis, University of Warwick.
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Official URL: http://webcat.warwick.ac.uk/record=b3849931
Abstract
The sensitivity of the measurement of the magnitude of the Cabibbo- Kobayashi-Maskawa quark-mixing matrix element |Vcb| was estimated using full Monte Carlo simulation of the data recorded by the ATLAS experiment. The Monte Carlo dataset corresponds to the luminosity of 139 fb−1 at centre of- mass energy of √ s = 13 TeV which was recorded by the ATLAS experiment during the full Run 2 of the Large Hadron Collider. The analysis utilises the on-shell W boson decays in top quark pair events in which one top quark decays leptonically, t → Wb → (ℓν)b, and serves as the tag of the event, while the other top quark decays hadronically, t → Wb → (cb)b. Selection criteria were implemented in order to reject background events stemming from single top, W+jets, Z+jets and diboson events, as well as other top quark pair decay modes. Finally, a maximum likelihood method was used to reach the estimation of the fractional sensitivity of the measurement of Δ|Vcb|/|Vcb| = 0.14(stat.) ⊕ 0.10(syst.). The outlined analysis will be the first attempt to measure |Vcb| at the energy scale of the on-shell W boson mass, Q2 ∼ (104) GeV2.
Item Type: | Thesis (PhD) | ||||
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Subjects: | Q Science > QA Mathematics Q Science > QC Physics |
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Library of Congress Subject Headings (LCSH): | Matrices, Quarks, W bosons, Particles (Nuclear physics) -- Mathematical models, Decay schemes (Radioactivity), Monte Carlo method, Large Hadron Collider (France and Switzerland) | ||||
Official Date: | January 2022 | ||||
Dates: |
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Institution: | University of Warwick | ||||
Theses Department: | Department of Physics | ||||
Thesis Type: | PhD | ||||
Publication Status: | Unpublished | ||||
Supervisor(s)/Advisor: | Harrison, P. F. | ||||
Sponsors: | Science and Technology Facilities Council (Great Britain) | ||||
Format of File: | |||||
Extent: | xix, 130 leaves : illustrations (some colour), charts (some colour) | ||||
Language: | eng |
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