A study of missing transverse energy in minimum bias events with in-time pile-up at the Large Hadron Collider using the ATLAS Detector and √s=7 TeV proton-proton collision data

dc.contributor.authorWang, Kuhan
dc.contributor.supervisorKeeler, Richard K.
dc.date.accessioned2011-08-03T17:59:49Z
dc.date.available2011-08-03T17:59:49Z
dc.date.copyright2011en_US
dc.date.issued2011-08-03
dc.degree.departmentDept. of Physics and Astronomyen_US
dc.degree.levelMaster of Science M.Sc.en_US
dc.description.abstractA sample of $ L dt = 3.67 pb{-1} of minimum bias events observed using the ATLAS detector at the Large Hadron Collider at $\s=7 TeV is analyzed for Missing Transverse Energy (MET) response in the presence of in-time pile-up. We find that the MET resolution ($\sigma_\text{X,Y}$) is consistent with a simple model of the detector response for minimum bias events, scaling with respect to the sum of the scalar energy ($\sum E_\text{T}$) as $\sigma_\text{X,Y}=A\sqrt{\sum E_\text{T} }$. This behavior is observed in the presence of in-time pile-up and does not vary with global calibration schemes. We find a bias in the mean ($\mu_\text{X,Y}$) of the MET that is linear with respect to $\sum E_\text{T}$, leading to an asymmetry in the $\phi_\text{X,Y}$ distribution of the MET. We propose an explanation for this problem in terms of a misalignment of the nominal center of the ATLAS detector with respect to its real center. We contrast the data with a Monte Carlo sample produced using PYTHIA. We find that the resolution, bias and asymmetry are all approximately reproduced in simulation.en_US
dc.description.scholarlevelGraduateen_US
dc.identifier.urihttp://hdl.handle.net/1828/3437
dc.languageEnglisheng
dc.language.isoenen_US
dc.rights.tempAvailable to the World Wide Weben_US
dc.subjectLarge Hadron Collideren_US
dc.subjectATLASen_US
dc.subjectParticle Physicsen_US
dc.subjectMinimum Bias Eventsen_US
dc.subjectPile-upen_US
dc.subjectMissing Transverse Energyen_US
dc.titleA study of missing transverse energy in minimum bias events with in-time pile-up at the Large Hadron Collider using the ATLAS Detector and √s=7 TeV proton-proton collision dataen_US
dc.typeThesisen_US

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