Search for heavy, top-like quark pair production in the dilepton final state in pp collisions at √s = 7 TeV

Bauer, Gerry P. ; Bendavid, J. ; Busza, Wit ; Cali, Ivan Amos ; Chan, M. ; Dutta, V. ; Gomez-Ceballos, Guillelmo ; Goncharov, Maxim ; Hahn, Kristian Allan ; Kim, Y. ; Klute, Markus ; Lee, Y.-J. ; Li, W. ; Luckey, P. David, Jr. ; Teng, Ma ; Nahn, Steven ; Paus, Christoph M. E. ; Ralph, Duncan Kelley ; Roland, Christof E. ; Rudolph, Matthew Scott ; Stephans, George S. F. ; Stockli, Fabian ; Sumorok, Konstanty C. ; Sung, Kevin Kai Hong ; Velicanu, Dragos Alexandru ; Wenger, Edward Allen ; Wolf, R. ; Wyslouch, Boleslaw ; Xie, S. ; Yang, M. ; Yilmaz, Yetkin ; Yoon, A. S. ; Zanetti, Marco ; Butz, Erik M. ; Roland, Gunther M. ; Ma, Teng

Elsevier

Others  :  http://dspace.mit.edu/openaccess-disseminate/1721.1/91888

美国|英语

来源: MIT Theses in DSpace@MIT

【 摘 要 】

The results of a search for pair production of a heavy, top-like quark, t′, in the decay mode t′t¯′ → bW+b¯W[superscript −] → bℓ+νb¯ℓ[superscript −]ν¯ are presented. The search is performed with a data sample corresponding to an integrated luminosity of 5.0 fb [superscript −1] in pp collisions at a center-of-mass energy of 7 TeV, collected by the CMS experiment at the LHC. The observed number of events agrees with the expectation from standard model processes, and no evidence of t′t¯′ production is found. Upper limits on the production cross section as a function of t′ mass are presented, and t′ masses below 557 [GeV over c[superscript 2]] are excluded at the 95% confidence level.