The performance of the ATLAS missing transverse momentum high-level trigger in 2015 pp collisions at 13 TeV

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dc.contributor.authorChiu, Justin
dc.contributor.supervisorKowalewski, Robert V.
dc.date.accessioned2016-09-09T22:05:08Z
dc.date.available2016-09-09T22:05:08Z
dc.date.copyright2016en_US
dc.date.issued2016-09-09
dc.degree.departmentDepartment of Physics and Astronomy
dc.degree.levelMaster of Science M.Sc.en_US
dc.description.abstractThe performance of the ATLAS missing transverse momentum (ETmiss) high-level trigger during 2015 operation is presented. In 2015, the Large Hadron Collider operated at a higher centre-of-mass energy and shorter bunch spacing (sqrt(s) = 13 TeV and 25 ns, respectively) than in previous operation. In future operation, the Large Hadron Collider will operate at even higher instantaneous luminosity (O(10^34 cm^−2 s^−1)) and produce a higher average number of interactions per bunch crossing, <mu>. These operating conditions will pose significant challenges to the ETmiss trigger efficiency and rate. An overview of the new algorithms implemented to address these challenges, and of the existing algorithms is given. An integrated luminosity of 1.4 fb^−1 with <mu> = 14 was collected from pp collisions of the Large Hadron Collider by the ATLAS detector during October and November 2015 and was used to study the efficiency, correlation with offline reconstruction, and rates of the trigger algorithms. The performance was found to be satisfactory. From these studies, recommendations for future operating specifications of the trigger were made.en_US
dc.description.proquestcode0798,en_US
dc.description.proquestemailjchiu@uvic.caen_US
dc.description.scholarlevelGraduateen_US
dc.identifier.urihttp://hdl.handle.net/1828/7535
dc.languageEnglisheng
dc.language.isoenen_US
dc.rightsAvailable to the World Wide Weben_US
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/2.5/ca/*
dc.subjectphysicsen_US
dc.subjecttriggeren_US
dc.subjectparticle physicsen_US
dc.subjectATLAS experimenten_US
dc.subjectCERNen_US
dc.subjectmissing transverse momentumen_US
dc.subjectMETen_US
dc.subjectATLAS detectoren_US
dc.subjectLHCen_US
dc.titleThe performance of the ATLAS missing transverse momentum high-level trigger in 2015 pp collisions at 13 TeVen_US
dc.typeThesisen_US

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