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1.	Abazov, V. M., et al. (author) Search for pair production of second generation scalar leptoquarks 2009 In: Physics Letters B. - : Elsevier BV. - 0370-2693 .- 1873-2445. ; 671:2, s. 224-232 Journal article (peer-reviewed)abstract We report on a search for the pair production of second generation scalar leptoquarks (LQ) in p (p) over bar collisions at the center of mass energy root s- = 1.96 TeV using a data set corresponding to an integrated luminosity of 1.0 fb(-1) collected with the D empty set experiment at the Fermilab Tevatron Collider. Topologies arising from the LQ (LQ) over bar -> mu q nu q and LQ (LQ) over bar -> mu q mu q decay modes are investigated. No excess of data over the standard model prediction is observed and upper limits on the leptoquark pair production cross section are derived at the 95% C.L. as a function of the leptoquark mass and the branching fraction beta for the decay LQ -> mu q. These are interpreted as lower limits on the leptoquark mass as a function of beta. For beta = 1 (0.5), scalar second generation leptoquarks with masses up to 316 GeV (270 GeV) are excluded.
2.	Abazov, M, et al. (author) Measurement of the t(t)over-bar production cross section and top quark mass extraction using dilepton events in p(p)over-bar collisions 2009 In: Physics Letters B. - : Elsevier BV. - 0370-2693 .- 1873-2445. ; 679:3, s. 177-185 Journal article (peer-reviewed)abstract We present a measurement of the top quark pair production cross section in p (p) over bar collisions at root s = 1.96 TeV using approximately 1 fb(-1) collected with the DO detector. We consider decay channels containing two high p(T) charged leptons where one lepton is identified as an electron or a muon while the other lepton can be an electron, a muon or a hadronically decaying tau lepton. For a mass of the top quark of 170 GeV, the measured cross section is 7.5(-1.0)(+1.0)(stat)(-0.6)(+0.7)(syst)(-0.5)(+0.6)(lumi) pb. Using l tau events only, we measure: sigma(t (t) over bar) x B(t (t) over bar -> l tau b (b) over bar) = 0.13(-0.08)(+0.09)(stat)(-0.06)(+0.06)(syst)(-0.02)(+0.02)(lumi) pb. Comparing the measured cross section as a function of the mass of the top quark with a partial next-to-next-to leading order Quantum Chroniodynamics theoretical prediction, we extract a mass of the top quark of 171.5(-8.8)(+9-9) GeV, in agreement with direct measurements.

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Type of publication: journal article (2)

Type of content: peer-reviewed (2)

Author/Editor: Abbott, B. (2); Strandberg, Jonas (2); Andeen, T. (2); Aoki, M. (2); Begel, M. (2); Belanger-Champagne, ... (2); show more...; Borissov, G. (2); Brandt, A. (2); Brock, R. (2); Brooijmans, G. (2); Burdin, S. (2); Calfayan, P. (2); Calvet, S. (2); Chakraborty, D. (2); Cheu, E. (2); Cooke, M. (2); Crepe-Renaudin, S. (2); De, K. (2); Deliot, F. (2); Duflot, L. (2); Enari, Y. (2); Evans, H. (2); Fiedler, F. (2); Fox, H. (2); Garcia, C. (2); Gillberg, D. (2); Grohsjean, A. (2); Guo, J. (2); Gutierrez, P. (2); Haas, A. (2); Haefner, P. (2); Han, L. (2); Hensel, C. (2); Hubacek, Z. (2); Jakobs, K. (2); Kaushik, V. (2); Kehoe, R. (2); Khanov, A. (2); Kuhl, T. (2); Kupco, A. (2); Kvita, J. (2); Lammers, S. (2); Li, L. (2); Liu, Y. (2); Lokajicek, M. (2); Martin, B. (2); Meyer, J. (2); Mitrevski, J. (2); Nunnemann, T. (2); Owen, M. (2); show less...

University: Royal Institute of Technology (2); Uppsala University (2); Stockholm University (2)

Language: English (2)

Research subject (UKÄ/SCB): Natural sciences (2)

Year: 2009 (2)

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