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Works: 103 works in 157 publications in 3 languages and 1,287 library holdings dgs, Author, Other, Contributor, Editor, htt
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Most widely held works by Arnulf Quadt

19 editions published between 2007 and 2010 in English and German and held by 466 WorldCat member libraries worldwide

More than ten years after its discovery, still relatively little is known about the top quark, the heaviest known elementary particle. The present extensive survey summarizes and reviews top-quark physics based on the precision measurements at the Fermilab Tevatron Collider, as well as the sensitivity of these experiments to new physics. Finally, an outlook on top quark physics at the Large Hadron Collider is given
Measurement of the W-boson Polarisation in Top-Quark Decays with the ATLAS Detector by Andrea Helen Knue( )

2 editions published in 2013 in English and held by 31 WorldCat member libraries worldwide

Eine Messung der W-Boson Polarisation in Topquark-Zerfaellen wird vorgestellt. Es wurden Topquarks untersucht, welche in Proton-Proton Kollisionen bei einer Schwerpunktsenergie von sqrt{s} = 7 TeV am LHC erzeugt wurden. Der Datensatz basiert auf einer integrierten Luminositaet von 4.7 fb-1 und wurde mit dem ATLAS-Detektor gesammelt. Die Messung wurde im Lepton+Jets Kanal durchgefuehrt, welcher durch ein isoliertes Elektron oder Myon, fehlende transversale Energie und mindestens vier Jets charakterisiert wird. Einer der Jets muss als b-Jet identifiziert sein. Zum Studium der W-Boson Polarisa
Physics with Jets in Association with a Z Boson in pp-collisions with the ATLAS Detector at the Large Hadron Collider by Katharina Bierwagen( )

2 editions published in 2013 in English and held by 31 WorldCat member libraries worldwide

Die Arbeit beschreibt die Messung des Wirkungsquerschnittes für die Produktion von Jets in Ereignissen mit Z-Bosonen in Proton-Proton Kollisionen bei einer Schwerpunktsenergie von √s = 7 TeV mit einer integrierten Luminosität von ∫Ldt = 36-1 und ∫Ldt = 4.6 fb-1 aufgenommen mit dem ATLAS Experiment am Large Hadron Collider in Genf. Die inklusiven und differenziellen Wirkungsquerschnitte für Z (→ e+ e-) + jets werden für Jets mit einem Transversalimpuls von pT(jet) > 30 GeV und einer Rapidität von |y(jet)| < 4.4 gemessen. Die Datensätze erlauben Messungen in vorher nicht zugänglichen Phasen
Search for Supersymmetry in Final States with Leptons with the ATLAS Detector at the Large Hadron Collider by Matthias Hamer( )

2 editions published in 2013 in English and held by 31 WorldCat member libraries worldwide

After a short review of the Standard Model of Elementary Particle Physics and its minimal supersymmetric extension, the MSSM, a global analysis of two highly simplified supersymmetric models, the CMSSM and the NUHM1 is presented, with a focus on the fine-tuning of these models. A new, phenomenologically motivated measure for fine-tuning is introduced. In addition, a search for supersymmetry in final states with four leptons is presented, where a procedure for the consideration of trigger efficiencies with a focus on the calculation of uncertainties on the sum of event weights is given. Fina
Precision Measurements of the Top Quark Pair Production Cross Section in the Single Lepton Channel with the ATLAS Experiment by Anna Christine Henrichs( )

1 edition published in 2012 in English and held by 29 WorldCat member libraries worldwide

Assessing and Improving Interoperability of Distributed Systems by Thomas Rings( )

2 editions published between 2012 and 2013 in English and held by 29 WorldCat member libraries worldwide

Interoperabilität von verteilten Systemen ist eine Grundlage für die Entwicklung von neuen und innovativen Geschäftslösungen. Sie erlaubt es existierende Dienste, die auf verschiedenen Systemen angeboten werden, so miteinander zu verknüpfen, dass neue oder erweiterte Dienste zur Verfügung gestellt werden können. Außerdem kann durch diese Integration die Zuverlässigkeit von Diensten erhöht werden. Das Erreichen und Bewerten von Interoperabilität stellt jedoch eine finanzielle und zeitliche Herausforderung dar. Zur Sicherstellung und Bewertung von Interoperabilität werden systematische Method
A Top Quark Mass Measurement Using the R32 Stabilized Variable with the ATLAS Detector by Stefan Guindon( )

1 edition published in 2012 in English and held by 29 WorldCat member libraries worldwide

Development of the readout for the IBL Upgrade Project of the ATLAS Pixel Detector by Nina Krieger( )

2 editions published in 2012 in English and held by 27 WorldCat member libraries worldwide

The LHC luminosity is upgraded in several phases until 2022. The resulting higher occupancy degrades the detector performance of the current Pixel Detector. To provide a good performance during the LHC luminosity upgrade, a fourth pixel layer is inserted into the existing ATLAS Pixel Detector. A new FE-I4 readout chip and a new data acquisition chain are required to cope with the higher track rate and the resulting increased bandwidth. Among others, this includes a new readout board: the IBL ROD. One component of this board is the DSP which creates commands for the FE-I4 chip and has to be
Calorimeter-Based Triggers at the ATLAS Detector for Searches for Supersymmetry in Zero-Lepton Final States by Alexander Mann( )

1 edition published in 2012 in English and held by 25 WorldCat member libraries worldwide

Search for the Standard Model Higgs boson produced in association with a pair of top quarks and decaying into a bb-pair in the single lepton channel at s = 13 TeV with the ATLAS experiment at the LHC by Matteo Mantoani( )

2 editions published in 2017 in Italian and held by 18 WorldCat member libraries worldwide

This thesis presents a search for Standard Model Higgs boson produced in association with top quark pairs, ttH. The analysis uses 13.2 fb-1 of pp collision data at √s = 13 TeV collected in 2015 and 2016 with the ATLAS detector at the LHC. The considered decay mode for the Higgs boson is H->bb and the single lepton decay channel (electron or muon) for the tt pair. The sensitivity of this channel is improved by an event categorisation according to the jet multiplicity and the number of jets containing a b-hadron decay. Multivariate techniques are used to distinguish the signa
Phenomenology at a future 100 TeV hadron collider by Piero Ferrarese( )

3 editions published between 2017 and 2018 in English and held by 18 WorldCat member libraries worldwide

Run 1 of the Large Hadron Collider (LHC) has been one of the most successful experiments in particle physics. We are now approaching the end of LHC Run 2, and whether we will discover new physics or not, the high energy particle physics community is already inspecting various possibilities for the future generation of colliders. One of the most intriguing scenarios deals with the exploration of energies so far not reached, with energy scales up to several TeVs, as for example a $\sqrt{s} = 100$ TeV hadron-hadron collider. This thesis inspects the phenomenological potential of such a machin
Monitoring and Optimization of ATLAS Tier 2 Center GoeGrid by Erekle Magradze( )

2 editions published in 2016 in English and held by 18 WorldCat member libraries worldwide

The demand on computational and storage resources is growing along with the amount of infor- mation that needs to be processed and preserved. In order to ease the provisioning of the digital services to the growing number of consumers, more and more distributed computing systems and platforms are actively developed and employed. The building block of the distributed computing infrastructure are single computing centers, similar to the Worldwide LHC Computing Grid, Tier 2 centre GoeGrid. The main motivation of this thesis was the optimization of GoeGrid perfor- mance by efficient monitoring
Direct Top Quark Decay Width Measurement in the tt Lepton+Jets Channel at √s = 8 TeV with the ATLAS Experiment by Philipp Stolte-Cord to Krax( )

2 editions published in 2017 in English and held by 18 WorldCat member libraries worldwide

The top quark t plays an essential role in the field of elementary particle physics - in particular due to its exceptional properties comprising a large mass, which approximately equals the mass of a tungsten atom, and an enormously short lifetime. This thesis is devoted to the study of a fundamental property of the top quark - its decay width. Its value is predicted by the established Standard Model of particle physics and deviations may hint at yet unknown physics beyond this model. A direct measurement of the decay width of the top quark is presented. The analysis is based on tt events i
HappyFace as a monitoring tool for the ATLAS experiment by Haykuhi Musheghyan( )

2 editions published in 2016 in English and held by 18 WorldCat member libraries worldwide

The importance of monitoring on HEP grid computing systems is growing due to a significant increase in their complexity. Computer scientists and administrators have been studying and building effective ways to gather information on and clarify a status of each local grid infrastructure. The HappyFace project aims at making the above-mentioned workflow possible. It aggregates, processes and stores the information and the status of different HEP monitoring resources into the common database of HappyFace. The system displays the information and the status through a single interface. However, t
Measurement of the Higgs Boson Production Cross Section in Hadronic Final States in 13 TeV Proton-Proton Collisions with the ATLAS Detector by Eric Drechsler( )

4 editions published between 2018 and 2019 in English and held by 18 WorldCat member libraries worldwide

The couplings of the Standard Model Higgs boson to fermions provide valuable insights into the nature of electroweak symmetry breaking in the Yukawa sector. This thesis summarises the measurement of the Higgs boson production cross section in decays to two hadronically decaying -leptons. The measurement is based on 36.1 fb⁻¹ proton-proton collision data at a centre-of-mass energy of 13 TeV recorded in 2015 and 2016 with the Atlas detector at the Large Hadron Collider. A cut-based and a multivariate analysis approach are investigated, based on the reconstructed mass and boosted decision tree
Measurement of the ttZ production cross section in the final State with three charged leptons using 36.1 fb^-1 of pp collisions at 13 TeV at the ATLAS detector by Nils-Arne Rosien( )

3 editions published between 2017 and 2018 in English and held by 18 WorldCat member libraries worldwide

In dieser Dissertation wird eine Messung des Wirkungsquerschnitts für die Produktion von Top-Quark-Paaren, zusammen mit einem Z-Boson (ttZ), präsentiert. Endzustände mit exakt drei geladenen Leptonen (Elektronen oder Myonen) werden verwendet, was den Zerfall des Top-Quark-Paares im Lepton+Jets-Kanal und den Zerfall des Z-Bosons in geladene Leptonen berücksichtigt. Der Datensatz für diese Analyse entspricht einer integrierten Luminosität von 36.1 fb^-1 aus Proton-Proton-Kollisionen bei einer Schwerpunktsenergie von 13 TeV, aufgezeichnet in 2015 und 2016 vom ATLAS-Detektor am LHC. Das Ergebni
Detector Development for the High Luminosity Large Hadron Collider by Julia Rieger( )

2 editions published in 2016 in English and held by 18 WorldCat member libraries worldwide

To maximise the discovery potential of the Large Hadron Collider, it will be upgraded to the High Luminosity Large Hadron Collider in 2024. New detector challenges arise from the higher instantaneous luminosity and the higher particle flux. The new ATLAS Inner Tracker will replace the current tracking detector to be able to cope with these challenges. Many pixel detector technologies exist for particle tracking, but their suitability for the ATLAS Inner Tracker needs to be studied. Active high-voltage CMOS sensors, which are produced in industrialised processes, offer a fast readout and rad
Monitoring Radiation Damage in the ATLAS Pixel Detector by André Lukas Schorlemmer( )

2 editions published in 2014 in English and held by 18 WorldCat member libraries worldwide

Radiation hardness is one of the most important features of the ATLAS pixel detector in order to ensure a good performance and a long lifetime. Monitoring of radiation damage is crucial in order to assess and predict the expected performance of the detector. Key values for the assessment of radiation damage in silicon, such as the depletion voltage and depletion depth in the sensors, are measured on a regular basis during operations. This thesis summarises the monitoring program that is conducted in order to assess the impact of radiation damage and compares it to model predictions. In addi
Measurement of the W Boson Helicity Fractions in Top/anit-Top Events at 8 TeV in the Lepton + Jets Channel with the ATLAS Detector by Mohammad Jawad Kareem( )

2 editions published in 2017 in English and held by 18 WorldCat member libraries worldwide

Precise measurements of the properties of the top quark allow for testing the Standard Model (SM) and can be used to constrain new physics models. The top quark is predicted in the SM to decay almost exclusively to a W boson and b-quark. Thus, studying the Wtb vertex structure at high precision and in detail is motivated. This thesis presents a measurement of the W boson helicity fractions in top quark decays with top/anit-top events in the lepton + jets final state using proton-proton collisions at a centre-of-mass energy of 8 TeV recorded in 2012 with the ATLAS detector at the LHC. The da

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