Measurement of the cross section ratio σ[subscript t[bar over t]b[bar over b]]/σ[subscript t[bar over t]jj] in pp collisions at √s = 8 TeV
Author(s)Apyan, Aram; Barbieri, Richard Alexander; Bauer, Gerry P.; Busza, Wit; Cali, Ivan Amos; Chan, Matthew Hans; Di Matteo, Leonardo; Dutta, Valentina; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Gulhan, Doga Can; Klute, Markus; Lai, Yue Shi; Lee, Yen-Jie; Levin, Andrew Michael; Luckey, P. David, Jr.; Ma, Teng; Paus, Christoph M. E.; Ralph, Duncan Kelley; Roland, Christof E.; Roland, Gunther M.; Stephans, George S. F.; Stockli, Fabian; Sumorok, Konstanty C.; Velicanu, Dragos Alexandru; Veverka, Jan; Wyslouch, Boleslaw; Yang, Mingming; Zanetti, Marco; Zhukova, Victoria; ... Show more Show less
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The first measurement of the cross section ratio σ[subscript t[bar over t]b[bar over b]/σ[subscript t[bar over t]jj] is presented using a data sample corresponding to an integrated luminosity of 19.6 fb[superscript −1] collected in pp collisions at √s = 8 TeV with the CMS detector at the LHC. Events with two leptons (e or μ) and four reconstructed jets, including two identified as b quark jets, in the final state are selected. The ratio is determined for a minimum jet transverse momentum p[subscript T] of both 20 and 40 GeV/c . The measured ratio is 0.022 ± 0.003(stat) ± 0.005(syst) for p[subscript T]>20 GeV/c. The absolute cross sections σ[subscript t[bar over t]b[bar over b] and σ[subscript t[bar over t]jj] are also measured. The measured ratio for p[subscript T]>40 GeV/c is compatible with a theoretical quantum chromodynamics calculation at next-to-leading order.
DepartmentMassachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science; Massachusetts Institute of Technology. School of Science
Physics Letters B
Khachatryan, V., et al. “Measurement of the Cross Section Ratio σ[subscript t[bar over t]b[bar over b]]/σ[subscript t[bar over t]jj] in pp Collisions at √s = 8 TeV.” Physics Letters B 746 (June 2015): 132–153. © 2015 CERN for the benefit of the CMS Collaboration
Final published version