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Search for New Physics in the Missing Transverse Energy + Dijet Channel at CDF.

出版	Library and Archives Canada = Bibliothèque et Archives Canada, 2009
ISBN	04945911379780494591130
URL	http://books.google.com.hk/books?id=_xRCQwAACAAJ&hl=&source=gbs_api

註釋This thesis presents the results of a signature-based search for new physics using the exclusive dijet plus missing transverse energy data sample from 2 fb-1 of pp ̄ collisions at s = 1.96 TeV collected with the Collider Detector at Fermilab (CDF). A study is made of the production of events with two high energy jets and large missing transverse energy (missing ET, or ET / ) in a kinematic regime requiring the scalar sum of the E T of the two jets (referred to here as HT) to be greater than 125 GeV and the event ET / to be above 80 GeV. A second kinematic region is also examined, with the ET / cut increased to 100 GeV and the HT cut increased to 225 GeV. The number of events observed in the data is within 0.43 standard deviations of the expected number of background events in the low kinematic region, and within 0.34 standard deviations in the high kinematic region. Based on these results, 95% C.L. lower mass limits for scalar leptoquarks are extracted: 190 GeV/c2 for 1st generation, 190 GeV/c2 for 2nd generation, and 178 GeV/ c2 for 3rd generation production. The results are also interpreted in terms of cross-section limits on generic minimal supersymmetric (MSSM) models.