Differential measurements of Z and γ bosons produced with jets at the CMS experiment
File(s)
Author(s)
Zecchinelli, Angelo Giacomo
Type
Thesis
Abstract
This thesis presents measurements of the differential cross-sections of Z + jets and γ + jets, and their ratio, as a function of the boson transverse momentum. In addition, a description of measurements of the angular
distribution between the Z boson direction and a jet in events where the Z boson is emitted collinear with a jet is reported. The analysis is based on a data sample of proton-proton collisions at a centre-of-mass energy of 13 TeV corresponding to an integrated luminosity of 35.9 inverse fb recorded by the CMS experiment at the LHC. The data are compared to different theoretical predictions after correcting for detector effects. In general, the predictions at higher orders in perturbation theory show better agreement with the data. These results represent the first measurement of the differential cross-section ratio of Z + jets and γ + jets at 13 TeV and the first explicit measurement of
collinear Z emission.
distribution between the Z boson direction and a jet in events where the Z boson is emitted collinear with a jet is reported. The analysis is based on a data sample of proton-proton collisions at a centre-of-mass energy of 13 TeV corresponding to an integrated luminosity of 35.9 inverse fb recorded by the CMS experiment at the LHC. The data are compared to different theoretical predictions after correcting for detector effects. In general, the predictions at higher orders in perturbation theory show better agreement with the data. These results represent the first measurement of the differential cross-section ratio of Z + jets and γ + jets at 13 TeV and the first explicit measurement of
collinear Z emission.
Version
Open Access
Date Issued
2021-03
Date Awarded
2021-10
Copyright Statement
Creative Commons Attribution NonCommercial Licence
License URL
Advisor
Malik, Sarah
Davies, Gavin
Sponsor
The Royal Society
Publisher Department
Physics
Publisher Institution
Imperial College London
Qualification Level
Doctoral
Qualification Name
Doctor of Philosophy (PhD)