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Search for Contact Interactions with Dimuons at the Atlas Detector

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dc.contributor.advisorStéphane Willocq
dc.contributor.advisorBenjamin Brau
dc.contributor.advisorEugene Golowich
dc.contributor.authorThompson, Emily
dc.contributor.departmentUniversity of Massachusetts Amherst
dc.date2023-09-23T04:53:56.000
dc.date.accessioned2024-04-26T19:50:19Z
dc.date.available2024-04-26T19:50:19Z
dc.date.issued2011-09-01
dc.description<p>The Standard Model has been very successful over the last few decades in its agreement with experimental evidence; however there are some remaining puzzles in our understanding of the Universe which have yet to be solved. Even if the Higgs boson and Super Symmetry are discovered, questions still arise, such as why Nature is primarily made of matter when antimatter should have been produced in equal amounts at the beginning of the Universe, why the fundamental particles have the mass hierarchy that they do, what the nature of dark matter is, or whether or not quarks and leptons are themselves made of constituent parts, just to name a few. Theories Beyond the Standard Model attempt to tackle these questions, and also provide alternative explanations for electroweak symmetry breaking in case the Higgs mechanism in the Standard Model contradicts what is observed. The ATLAS detector was built to discover new physics from high-energy proton-proton collisions delivered by the Large Hadron Collider and to probe the electroweak scale with hard interactions at energies near ~1 TeV. While searching for new physics processes occurring at a much higher invariant mass than available at previous colliders, understanding the performance of the detector is crucial, especially during the first few months of running. This thesis presents a motivation for using dimuons to search for new physics in early ATLAS data, a measurement of the Z<sup>0</sup>/γ ->μμ cross section as a first test of Standard Model theoretical predictions at √s =7 TeVqqμμ, and finally a search for new physics via a four-fermion contact interaction in the dimuon channel (<em>qqμμ) </em>using the full 2010 data set.</p>
dc.description.abstractThe Standard Model has been very successful over the last few decades in its agreement with experimental evidence; however there are some remaining puzzles in our understanding of the Universe which have yet to be solved. Even if the Higgs boson and Super Symmetry are discovered, questions still arise, such as why Nature is primarily made of matter when antimatter should have been produced in equal amounts at the beginning of the Universe, why the fundamental particles have the mass hierarchy that they do, what the nature of dark matter is, or whether or not quarks and leptons are themselves made of constituent parts, just to name a few. Theories Beyond the Standard Model attempt to tackle these questions, and also provide alternative explanations for electroweak symmetry breaking in case the Higgs mechanism in the Standard Model contradicts what is observed. The ATLAS detector was built to discover new physics from high-energy proton-proton collisions delivered by the Large Hadron Collider and to probe the electroweak scale with hard interactions at energies near ~1 TeV. While searching for new physics processes occurring at a much higher invariant mass than available at previous colliders, understanding the performance of the detector is crucial, especially during the first few months of running. This thesis presents a motivation for using dimuons to search for new physics in early ATLAS data, a measurement of the Z0/γ ->μμ cross section as a first test of Standard Model theoretical predictions at √s =7 TeVqqμμ, and finally a search for new physics via a four-fermion contact interaction in the dimuon channel (qqμμ) using the full 2010 data set.
dc.description.degreeDoctor of Philosophy (PhD)
dc.description.departmentPhysics
dc.identifier.doihttps://doi.org/10.7275/2398161
dc.identifier.urihttps://hdl.handle.net/20.500.14394/38948
dc.relation.urlhttps://scholarworks.umass.edu/cgi/viewcontent.cgi?article=1490&amp;context=open_access_dissertations&amp;unstamped=1
dc.source.statuspublished
dc.subjectATLAS
dc.subjectcontact interaction
dc.subjectexotics
dc.subjectLHC
dc.subjectmuons
dc.subjectnew physics
dc.subjectPhysics
dc.titleSearch for Contact Interactions with Dimuons at the Atlas Detector
dc.typedissertation
dc.typearticle
dc.typedissertation
digcom.contributor.authorisAuthorOfPublication|email:emily.thompson@gmail.com|institution:University of Massachusetts Amherst|Thompson, Emily
digcom.identifieropen_access_dissertations/499
digcom.identifier.contextkey2398161
digcom.identifier.submissionpathopen_access_dissertations/499
dspace.entity.typePublication
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