Browsing Naturwissenschaften, Mathematik und Informatik by Advisor "Quadt, Arnulf Prof. Dr."
Now showing items 21-38 of 38
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HappyFace as a monitoring tool for the ATLAS experiment
(2016-10-24)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 ... -
Detector Development for the High Luminosity Large Hadron Collider
(2016-08-18)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 ... -
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 sqrt{s} = 8 TeV with the ATLAS experiment at the LHC
(2016-08-18)This thesis focuses on the search for the Standard Model Higgs boson produced in association with a pair of top quarks, ttH, using 20.3 fb-1 of pp collision data at sqrt{s} = 8 TeV, collected with the ATLAS detector at the ... -
Monitoring and Optimization of ATLAS Tier 2 Center GoeGrid
(2016-02-26)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 ... -
Radiation Hard 3D Diamond Sensors for Vertex Detectors at HL-LHC
(2016-02-12)Diamond is a good candidate to replace silicon as sensor material in the innermost layer of a tracking detector at HL-LHC, due to its high radiation tolerance. After particle fluences of $10^{16}\,{\rm protons/cm^2}$, ... -
Search for the Standard Model Higgs boson produced in association with tt and decaying into bb at 8 TeV with the ATLAS detector using the Matrix Element Method
(2015-11-02)A search for the Standard Model Higgs boson produced in association with a pair of top quarks (ttH) is presented. The analysis uses 20.3 fb−1 of pp collision data at √s = 8 TeV, collected with the ATLAS detector at the ... -
Measurement of the associated production of a vector boson (W, Z) and top quark pair in the opposite sign dilepton channel with pp collisions at √s = 8 TeV with the ATLAS detector
(2015-01-08)The heaviest known elementary particle predicted by the Standard Model (SM), the top quark, was discovered in 1995 by the CDF and D0 collaborations. The large top quark mass translates into a coupling to the Higgs boson ... -
Monitoring Radiation Damage in the ATLAS Pixel Detector
(2014-11-05)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 ... -
Measurement of Spin Correlations in Top/Anti-Top Events from pp Collisions at sqrt(s) = 7 TeV in the Lepton+Jets Final State with the ATLAS Detector
(2014-09-25)The top quark decays before it hadronises. Before its spin state can be changed in a process of strong interaction, it is directly transferred to the top quark decay products. The top quark spin can be deduced by studying ... -
Measurement of the W-boson Polarisation in Top-Quark Decays with the ATLAS Detector
(2013-09-20)A measurement of the W-boson polarisation in top-quark decays is presented. The top-antitop events were produced in proton-proton collisions at a centre-of-mass energy of sqrt{s} = 7 TeV at the LHC. The data set corresponds ... -
Physics with Jets in Association with a Z Boson in pp-collisions with the ATLAS Detector at the Large Hadron Collider
(2013-09-16)This thesis presents the measurements of the production cross section of jets in association with a Z boson in pp-collisions at √s = 7 TeV with an integrated luminosity of ∫Ldt = 36 pb−1 and ∫Ldt = 4.6 fb−1 recorded ... -
Development of the readout for the IBL Upgrade Project of the ATLAS Pixel Detector
(2012-12-05)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, ... -
Z →ττ Cross Section Measurement and ττ Mass Reconstruction with the ATLAS Detector at the LHC
(2012-11-14)In this dissertation, the Z to tautau decay where one τ decays leptonically and the other one hadronically is presented. The process is studied with data collected from the ATLAS experiment in pp collisions at c-m-s = 7 TeV ... -
A Top Quark Mass Measurement Using the R32 Stabilized Variable with the ATLAS Detector
(2012-08-31)This thesis presents one of the first measurements of the top quark mass at the ATLAS experiment, one of the four large experiments located along the LHC. First discovered in 1995 at the Tevatron experiments CDF and D0, ... -
Measurement of the inclusive <i>tγ</i> cross section at √<i>s</i> = 7 TeV with the ATLAS detector
(2012-06-12)A first measurement of the ttγ cross section in pp collisions at the LHC using 1.04 fb-1 of data taken with the ATLAS detector is presented. A total of 122 candidate events were identified in the single electron and single ... -
Precision Measurements of the Top Quark Pair Production Cross Section in the Single Lepton Channel with the ATLAS Experiment
(2012-05-10)Two precision measurements of the top quark pair production cross section in the lepton+jets channel are accomplished using data taken by the ATLAS experiment at the Large Hadron Collider at CERN. The data corresponds to ... -
Measurement of the Top Quark Pair Production Cross Section and Simultaneous Extraction of the W Heavy Flavor Fraction at √s = 7 TeV with the ATLAS Detector at the LHC
(2012-04-27)The top quark pair production cross section, σtt, is measured in the semileptonic channel in two datasets using a binned profiled likelihood template fit to data to discriminate the signal, tt, from its main background, ... -
Measurement of the charge asymmetry in top quark pair production in in pp collision data at √s = 7 TeV using the ATLAS detector
(2012-03-22)A measurement of the charge asymmetry in the production of top quark pairs in the semileptonic decay channel has been performed. A dataset corresponding to an integrated luminosity of 1.04 fb-1, btained at a centre-of-mass ...