A search for new resonances with the dijet angular ratio using the Compact Muon Solenoid Experiment
| Autor: | St. John, Jason Michael |
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| Rok vydání: | 2012 |
| Druh dokumentu: | Thesis/Dissertation |
| Popis: | Thesis (Ph.D.)--Boston University PLEASE NOTE: Boston University Libraries did not receive an Authorization To Manage form for this thesis or dissertation. It is therefore not openly accessible, though it may be available by request. If you are the author or principal advisor of this work and would like to request open access for it, please contact us at open-help@bu.edu. Thank you. A search for dijet resonances is performed using 2.2 fb-1 of proton-proton collision data at [Special characters omitted.] = 7 TeV recorded by the CMS detector at CERN. The study is based on the dijet angular ratio, the ratio of the number of events with the two leading jets having pseudorapidity difference |Δη| < 1.3 to the number of events with 1.3 < |Δη| < 3.0. Models of new resonances which decay into two jets typically predict dijet angular distributions and hence, values of the dijet angular ratio which differ from standard model processes. We thus use the measurement of the angular ratio as a function of mass to set limits on the cross sections of new spin-1⁄2 quark-gluon resonances. We exclude excited quarks of mass less than 3.2 TeV at 95% confidence level, where a limit of 2.8 TeV is expected. 2999-01-01 |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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