Measurement of the Production Cross Section of a Top-antitop Quark Pair in Association with a Z Boson at Root from S Equals 13 TeV with the ATLAS Detector
Title | Measurement of the Production Cross Section of a Top-antitop Quark Pair in Association with a Z Boson at Root from S Equals 13 TeV with the ATLAS Detector PDF eBook |
Author | Florian Christoph Maria Fischer |
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Pages | |
Release | 2020 |
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Measurement of the Production Cross Section of a Top-antitop Quark Pair in Association with a Z Boson at √s
Title | Measurement of the Production Cross Section of a Top-antitop Quark Pair in Association with a Z Boson at √s PDF eBook |
Author | Florian Christoph Maria Fischer |
Publisher | |
Pages | |
Release | 2020 |
Genre | Measurement |
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Cross-section Measurements of Top-quark Pair Production in Association with a Hard Photon at 13 TeV with the ATLAS Detector
Title | Cross-section Measurements of Top-quark Pair Production in Association with a Hard Photon at 13 TeV with the ATLAS Detector PDF eBook |
Author | Knut Zoch |
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Pages | 0 |
Release | 2020 |
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25 years after the top quark's discovery, the Large Hadron Collider at CERN produces proton-proton collision data on unprecedented scales at unprecedented energies - and has heralded an era of top-quark precision measurements. The production of a top-quark pair in association with a photon ($t bar{t} gamma$) gives access to the electromagnetic top-photon coupling, one of the fundamental properties of the top quark. Various extensions of the Standard Model predict modifications of the coupling strength or structure, and deviations from the Standard Model prediction of the $t bar{t} gamma$ pr...
Measurements of Differential Cross-sections in Top-quark Pair Events with a High Transverse Momentum Top Quark and Limits on Beyond the Standard Model Contributions to Top-quark Pair Production with the ATLAS Detector at [square Root]s
Title | Measurements of Differential Cross-sections in Top-quark Pair Events with a High Transverse Momentum Top Quark and Limits on Beyond the Standard Model Contributions to Top-quark Pair Production with the ATLAS Detector at [square Root]s PDF eBook |
Author | [Study Group] ATLAS Collaboration CERN |
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Pages | 0 |
Release | 2022 |
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Measurement of the Production Cross-section of a Single Top Quark in Association with a W Boson at 8 TeV with the ATLAS Experiment
Title | Measurement of the Production Cross-section of a Single Top Quark in Association with a W Boson at 8 TeV with the ATLAS Experiment PDF eBook |
Author | |
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Pages | 48 |
Release | 2016 |
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The cross-section for the production of a single top quark in association with a W boson in proton-proton collisions at √s = 8 is measured. The dataset corresponds to an integrated luminosity of 20.3 fb-1, collected by the ATLAS detector in 2012 at the Large Hadron Collider at CERN. Events containing two leptons and one central b-jet are selected. The Wt signal is separated from the backgrounds using boosted decision trees, each of which combines a number of discriminating variables into one classifier. Production of Wt events is observed with a significance of 7.7[sigma]. The cross-section is extracted in a profile likelihood fit to the classifier output distributions. The Wt cross-section, inclusive of decay modes, is measured to be 23.0±1.3(stat.)-3.5+3.2(syst.)±1.1(lumi.) pb. The measured cross-section is used to extract a value for the CKM matrix element.
Measurements of ZH and WH Production in the H → Bb Decay Channel in Pp Collisions at 13 TeV with the ATLAS Detector
Title | Measurements of ZH and WH Production in the H → Bb Decay Channel in Pp Collisions at 13 TeV with the ATLAS Detector PDF eBook |
Author | ATLAS Collaboration CERN |
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Pages | |
Release | 2020 |
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Abstract: Measurements are presented of the Standard Model Higgs boson decaying into a bb ̄ pair and produced in association with a W or Z boson decaying into leptons, using proton-proton collision data collected between 2015 and 2018 by the ATLAS detector. The measurements use data delivered by the Large Hadron Collider at a centre-of-mass energy of s√=13 TeV, corresponding to an integrated luminosity of 139 fb−1. The production of a Higgs boson in association with a W or Z boson is established, with observed (expected) significances of 4.0 (4.1) and 5.3 (5.1) standard deviations, respectively. Cross-sections of associated production of a Higgs boson decaying into bottom quark pairs with an electroweak gauge boson, W or Z, decaying into leptons are measured as a function of the gauge boson transverse momentum in kinematic fiducial volumes. The cross-section measurements are all consistent with the Standard Model expectations, and the total uncertainties vary from 30% in the high gauge boson transverse momentum regions to 85% in the low regions
Measurement of Top Quark-antiquark Pair Production in Association with a Z Boson with a Trilepton Final State in Pp Collisions at 8 TeV Center of Mass Energy
Title | Measurement of Top Quark-antiquark Pair Production in Association with a Z Boson with a Trilepton Final State in Pp Collisions at 8 TeV Center of Mass Energy PDF eBook |
Author | Ian Christopher MacNeill |
Publisher | |
Pages | 146 |
Release | 2015 |
Genre | |
ISBN | 9781321827149 |
A search for Z boson production with associated top-antitop pairs is performed with a final state which contains trileptons and b-tagged jets. The measurement is performed on the complete dataset of pp collisions at a center-of-mass energy of 8 TeV collected at the CMS detector, for a total instantaneous luminosity of 19.5 fb−1. A cross section is calculated for this final state and compared to the standard model prediction. The cross section for tt̄Z production is measured to be sigma=194+105/−89 fb. The measured cross section to theoretical cross section ratio is 0.94+0̇̇̇·51/−43. The process is measured with a significance of 2.33. This measurement is then combined with an outside 4 lepton channel measurement for an equivalent cross section measurement of sigma=200+90/−76 fb and a significance of 3.1.