A Measurement Of The Ratio Of The Production Cross Sections For W And Z Bosons In Association With Jets With The Atlas Detector PDF Download
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| Release | : 2014 |
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Download A Measurement of the Ratio of the Production Cross Sections for W and Z Bosons in Association with Jets with the ATLAS Detector Book in PDF, ePub and Kindle
In this study, the ratio of the production cross sections for W and Z bosons in association with jets has been measured in proton-proton collisions at √s = 7 TeV with the ATLAS experiment at the Large Hadron Collider. The measurement is based on the entire 2011 dataset, corresponding to an integrated luminosity of 4.6 fb-1. Inclusive and differential cross-section ratios for massive vector bosons decaying to electrons and muons are measured in association with jets with transverse momentum pT > 30 GeV and jet rapidity.
| Author | : James D. Pearce |
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| Release | : 2011 |
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Download W/Z+Jets Production Cross Section Ratio as a New Physics Search with the ATLAS Detector at CERN. Book in PDF, ePub and Kindle
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| Release | : 2015 |
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Download Measurements of the W Production Cross Sections in Association with Jets with the ATLAS Detector Book in PDF, ePub and Kindle
This paper presents cross sections for the production of a W boson in association with jets, measured in proton-proton collisions at \(\sqrt{s} = 7\) TeV with the ATLAS experiment at the large hadron collider. With an integrated luminosity of 4.6fb-1, this data set allows for an exploration of a large kinematic range, including jet production up to a transverse momentum of 1TeV and multiplicities up to seven associated jets. The production cross sections for W bosons are measured in both the electron and muon decay channels. Differential cross sections for many observables are also presented including measurements of the jet observables such as the rapidities and the transverse momenta as well as measurements of event observables such as the scalar sums of the transverse momenta of the jets. As a result, the measurements are compared to numerous QCD predictions including next-to-leading-order perturbative calculations, resummation calculations and Monte Carlo generators.
| Author | : Ksenia Gasnikova |
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| Release | : 2018 |
| Genre | : Force and energy |
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Download Measurement of the Total W- and Z-boson Production Cross Sections in Pp Collisions at 2.76 TeV with the ATLAS Detector Book in PDF, ePub and Kindle
| Author | : Rodger Mantifel |
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| Release | : 2017 |
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Download Measurement of the Production Cross Section of Jets in Association with a Z Boson in 8 TeV Proton-proton Collisions with the ATLAS Detector Book in PDF, ePub and Kindle
"This thesis presents the measurement of the production cross sections of jets in association with a Z boson in proton-proton collisions at √s = 8 TeV with an integrated luminosity of 20.3 fb−1 recorded by the ATLAS experiment at the Large Hadron Collider at CERN. Inclusive and differential Z/[gamma]∗(→ e+e−)+jets cross sections are measured for jets with a transversemomentum pT(jet) > 30 GeV and rapidity |y(jet)| 4.4. Z boson candidates are identified by their decay into electron pairs. In order to stringently probe the modelling of Z/[gamma]∗+jets production by Monte Carlo generators in regions of high-pT phase space typical for Higgs boson decay and searches for new physics, events with high-pT final states are investigated. High-pT final states are defined as events with either pT(Z) 300 GeV or pT(leading jet) > 300 GeV. A set of four observables, sensitive to the topology of the event, are measured for the standard event selection as well as in the regions of high-pT phase space. The results from data are unfolded to particle level and compared to calculations of the matrix element from Monte Carlo generators Alpgen+Pythia and Sherpa interfaced to a parton shower. The results show that Sherpa tends to model Z/[gamma]∗+jets production in high-pT regions of phase space much better than Alpgen+Pythia." --
| Author | : Peter Matthew Grudberg |
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| Total Pages | : 400 |
| Release | : 1997 |
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Download Measurement of the W and Z Boson Production Cross Sections in P, P̄ Collisions at [square Root Sign]s Book in PDF, ePub and Kindle
| Author | : James Christopher Buchanan |
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| Release | : 2012 |
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Download A Measurement of the Ratio of the W+1 Jet and Z+1 Jet Cross Sections Using the ATLAS Detector at the LHC. Book in PDF, ePub and Kindle
The first measurement of the ratio of the W and Z cross sections in association with a single jet, known as the R Jets measurement, is presented. The measurement was performed using 33pb-1 of integrated luminosity, recorded during the year 2010 by the ATLAS detector at the LHC. At this time the LHC was operating at a center-of-mass energy of /s = 7 TeV. The measurement is made as a function of the threshold on the jet transverse momentum, from 30 GeV up to a value of 200 GeV. The motivation for this measurement is outlined in terms of providing a stringent test of the Standard Model of particle physics, as well as a model independent tool for searching for new physics. Data driven tools are developed to perform the measurement and their performance is discussed. The result of the measurement is compared with the predictions of Next-to-Leading order perturbative QCD and found to be in good agreement over the entire range of transverse momenta considered.
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| Total Pages | : 39 |
| Release | : 2014 |
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Download Measurement of the Production Cross Sections for a Z Boson and One Or More B Jets in Pp Collisions at Sqrt(s) Book in PDF, ePub and Kindle
The production of a Z boson, decaying into two leptons and produced in association with one or more b jets, is studied using proton-proton collisions delivered by the LHC at a centre-of-mass energy of 7 TeV. The data were recorded in 2011 with the CMS detector and correspond to an integrated luminosity of 5 fb-1. The Z(ll) + b-jets cross sections (where ll = [mu][mu] or ee) are measured separately for a Z boson produced with exactly one b jet and with at least two b jets. In addition, a cross section ratio is extracted for a Z boson produced with at least one b jet, relative to a Z boson produced with at least one jet. The measured cross sections are compared to various theoretical predictions, and the data favour the predictions in the five-flavour scheme, where b quarks are assumed massless. The kinematic properties of the reconstructed particles are compared with the predictions from the MadGraph event generator using the pythia parton shower simulation.
| Author | : Elodie Resseguie |
| Publisher | : Springer Nature |
| Total Pages | : 336 |
| Release | : 2020-11-03 |
| Genre | : Science |
| ISBN | : 3030570169 |
Download Electroweak Physics at the Large Hadron Collider with the ATLAS Detector Book in PDF, ePub and Kindle
This thesis discusses searches for electroweakly produced supersymmetric partners of the gauge and the Higgs bosons (gauginos and higgsinos) decaying to multiple leptons, using pp collisions at sqrt(s) = 13 TeV. The thesis presents an in-depth study of multiple searches, as well as the first 13 TeV cross section measurement for the dominant background in these searches, WZ production. Two searches were performed using 36.1/fb of data: the gaugino search, which makes use of a novel kinematic variable, and the higgsino search, which produced the first higgsino limits at the LHC. A search using 139/fb of data makes use of a new technique developed in this thesis to cross check an excess of data above the background expectation in a search using a Recursive Jigsaw Reconstruction technique. None of the searches showed a significant excess of data, and limits were expanded with respect to previous results. These searches will benefit from the addition of luminosity during HL-LHC; however, the current detector will not be able to withstand the increase in radiation. Electronics for the detector upgrade are tested and irradiated to ensure their performance.
| Author | : Kenneth Craig Fowler |
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| Total Pages | : 156 |
| Release | : 2010 |
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Download Measurements of the Ratio of Z0 + JETS to Z0 Cross-sections in the ATLAS Detector at the Large Hadron Collider Book in PDF, ePub and Kindle
