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Stupak, John, III State University of New York at Stony Brook 2012 해외박사(DDOD)
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 = 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 mLQ < 558 GeV are excluded at a 95% confidence level for beta ≡ BR( LQ → eq) = 0.5. When combined with a complimentary search in the eejj final state, leptoquarks with mass mLQ < 607 (660) GeV are excluded for beta = 0.5 (1.0). These are the strongest limits in existence.