Gonzalez Lopez, Ricardo 
ORCID: 0000-0003-2302-8754
(2023)
Neutral-current Drell-Yan measurements at the ATLAS experiment and their phenomenological interpretation.
PhD thesis, University of Liverpool.
|
Text
201367388_Jun2023.pdf - Author Accepted Manuscript Download (12MB) | Preview |
Abstract
The neutral-current Drell-Yan production is a process for which precise predictions are currently available, offering a benchmark upon which these state-of-the-art predictions can be tested, both as a way to improve our understanding of Standard Model physics and explore theories that expand on the foundations it establishes. This thesis provides an overview of two analyses focusing on the Drell-Yan production using LHC Run 2 pp collision data collected by the ATLAS experiment during the years 2015 to 2018 at √s=13 TeV. First, a measurement of the single- and double-differential production cross-section in an invariant mass region of 116 to 5000 GeV is presented, using Z/γ* decays into lepton pairs in the electron and muon channels. The measurement is performed as a function of invariant mass, absolute rapidity of the lepton pair and their angle separation in the Z-boson rest frame. The results obtained are used to perform for the first time tests on lepton flavour universality (LFU) as well as set limits on Effective Field Theory (EFT) coefficients that modify the Drell-Yan production cross-section. Second, a novel search for Lorentz-invariance violating (LIV) signatures using Z-decays into electron and muon pairs is presented. Using the methodology for a luminosity measurement based on the counting of Z-bosons detected, the time-dependence of the Drell-Yan production can be monitored. While the Standard Model predicts no time-dependence on this process, deviations from this behaviour can be interpreted as the effects of LIV-inducing operators in the Standard Model Extension EFT. The results presented in this thesis include an overview of the Z-counting measurement methodology transfer to a flexible analysis framework, as well as the development of new time-dependent simulation tools to estimate expected sensitivities.
| Item Type: | Thesis (PhD) |
|---|---|
| Divisions: | Faculty of Science and Engineering > School of Physical Sciences |
| Depositing User: | Symplectic Admin |
| Date Deposited: | 11 Aug 2023 14:27 |
| Last Modified: | 11 Aug 2023 14:27 |
| DOI: | 10.17638/03171055 |
| Supervisors: |
|
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3171055 |
Dimensions
Dimensions
