Type
Text
Type
Dissertation
Advisor
Rijssenbeek, Michael , Tsybychev, Dmitri
Date
2012-08-01
Keywords
Leptoquark ATLAS LHC High-Energy Physics | Physics
Department
Department of Physics
Language
en_US
Source
This work is sponsored by the Stony Brook University Graduate School in compliance with the requirements for completion of degree.
Identifier
http://hdl.handle.net/11401/71424
Publisher
The Graduate School, Stony Brook University: Stony Brook, NY.
Format
application/pdf
Abstract
The Standard Model is an incomplete theory of nature. Numerous extensions of the Standard Model predict the existence of leptoquarks (LQ), color-triplet bosons which carry both baryon and lepton number. This dissertation presents the results of a search for pair production of first generation scalar leptoquarks in the eMETjj final state. The search is performed in pp collisions corresponding to an integrated luminosity of 1.03 fb^-1, at a center-of-mass energy s^1/2 = 7 TeV, recorded with the ATLAS detector at the LHC. A multivariate discriminant is used to distinguish signal-like events from background-like events. Observations are consistent with expectations from Standard Model backgrounds, thus limits on allowed LQ mass are determined. First generation scalar leptoquarks with mass m < 558 GeV are excluded at a 95% confidence level for Β = BR(LQ % → eq) = 0.5. When combined with a complimentary search in the eejj final state, leptoquarks with mass m < 607 (660) GeV are excluded for Β = 0.5 (1.0). These are the strongest limits in existence. | 179 pages
Recommended Citation
Stupak III, John, "A Search for First Generation
Leptoquarks in s^1/2 = 7 TeV pp Collisions with the ATLAS Detector" (2012). Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions). 630.
https://commons.library.stonybrook.edu/stony-brook-theses-and-dissertations-collection/630