The First Measurement of the Differential Cross-section of Electroweak W±W±jj Production at 13 TeV with the ATLAS Detector PDF Download
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Author: Shalu Solomon
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Languages : en
Pages : 0
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Author: Shalu Solomon
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Languages : en
Pages : 0
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Author: Ken Kreul
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Languages : en
Pages : 0
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Author: Nils-Arne Rosien
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Languages : en
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A measurement of the production cross section for a top quark pair in association with a Z boson (ttZ) is presented in this PhD thesis. Final states with exactly three charged leptons (electrons or muons) are used, taking into account the decay of the top quark pair in the lepton+jets channel and the decay of the Z boson into two charged leptons. The dataset used for this analysis corresponds to 36.1 fb^-1 of proton-proton collisions at a centre-of-mass energy of 13 TeV, recorded during 2015 and 2016 by the ATLAS detector at the Large Hadron Collider. The result of a profile likelihood fit ...
Author: Simone Marzani
Publisher: Springer
ISBN: 3030157091
Category : Science
Languages : en
Pages : 205
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This concise primer reviews the latest developments in the field of jets. Jets are collinear sprays of hadrons produced in very high-energy collisions, e.g. at the LHC or at a future hadron collider. They are essential to and ubiquitous in experimental analyses, making their study crucial. At present LHC energies and beyond, massive particles around the electroweak scale are frequently produced with transverse momenta that are much larger than their mass, i.e., boosted. The decay products of such boosted massive objects tend to occupy only a relatively small and confined area of the detector and are observed as a single jet. Jets hence arise from many different sources and it is important to be able to distinguish the rare events with boosted resonances from the large backgrounds originating from Quantum Chromodynamics (QCD). This requires familiarity with the internal properties of jets, such as their different radiation patterns, a field broadly known as jet substructure. This set of notes begins by providing a phenomenological motivation, explaining why the study of jets and their substructure is of particular importance for the current and future program of the LHC, followed by a brief but insightful introduction to QCD and to hadron-collider phenomenology. The next section introduces jets as complex objects constructed from a sequential recombination algorithm. In this context some experimental aspects are also reviewed. Since jet substructure calculations are multi-scale problems that call for all-order treatments (resummations), the bases of such calculations are discussed for simple jet quantities. With these QCD and jet physics ingredients in hand, readers can then dig into jet substructure itself. Accordingly, these notes first highlight the main concepts behind substructure techniques and introduce a list of the main jet substructure tools that have been used over the past decade. Analytic calculations are then provided for several families of tools, the goal being to identify their key characteristics. In closing, the book provides an overview of LHC searches and measurements where jet substructure techniques are used, reviews the main take-home messages, and outlines future perspectives.
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Languages : en
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This study presents cross sections for the production of a W boson in association with jets, measured in proton-proton collisions at √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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Category : Force and energy
Languages : en
Pages :
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Author: Albert M. Sirunyan
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Languages : en
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Author: Gregory Arthur Davis
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Category :
Languages : en
Pages : 252
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![Measurement of the W+W- Cross Section in [arrow]](https://books.google.com/books/content/images/frontcover/UDWQAQAACAAJ?fife=w80-h100)
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Languages : en
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This Letter presents a measurement of the W+W- production cross section in [arrow]" = 7 TeV pp collisions by the ATLAS experiment, using 34 inverse pb-1 of integrated luminosity produced by the Large Hadron Collider at CERN. Selecting events with two isolated leptons, each either an electron or a muon, 8 candidate events are observed with an expected background of 1.7"0.6 events. The measured cross section is 41+20-16(stat) " 5(syst) " 1(lumi) pb, which is consistent with the standard model prediction of 44 " 3 pb calculated at next-to-leading order in QCD.
Author: Felix Bührer
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Category :
Languages : en
Pages : 0
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