Measurement of the tt̄ production cross section in pp̄ collisions at √s = 1.96 TeV using kinematic characteristics of lepton + jets events
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 626:1-4 (2005) 45-54
Abstract:
We present a measurement of the top quark pair (tt̄) production cross section (σtt̄) in pp̄ collisions at a center-of-mass energy of 1.96 TeV using 230 pb-1 of data collected by the DØ detector at the Fermilab Tevatron Collider. We select events with one charged lepton (electron or muon), large missing transverse energy, and at least four jets, and extract the tt̄ content of the sample based on the kinematic characteristics of the events. For a top quark mass of 175 GeV, we measure σtt̄=6.7-1.3+1.4(stat) -1.1+1.6(syst)±0.4(lumi) pb, in good agreement with the standard model prediction. © 2005 Elsevier B.V. All rights reserved.Measurement of the tt̄ production cross section in pp̄ collisions at √s = 1.96 TeV in dilepton final states
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 626:1-4 (2005) 55-64
Abstract:
We present a measurement of the top quark pair (tt̄) production cross section in pp̄ collisions at √s=1.96 TeV using events with two charged leptons in the final state. This analysis utilizes an integrated luminosity of 224-243 pb-1 collected with the DØ detector at the Fermilab Tevatron Collider. We observe 13 events in the e+e -, eμ and μ+μ- channels with an expected background of 3.2±0.7 events. For a top quark mass of 175 GeV, we measure a tt̄ production cross section of σtt̄=8. 6-2.7+3.2(stat)±1.1(syst)±0.6(lumi) pb, consistent with the standard model prediction. © 2005 Elsevier B.V. All rights reserved.Measurement of the tt̄ production cross section in pp̄ collisions at √s = 1.96 TeV using lepton + jets events with lifetime b-tagging
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 626:1-4 (2005) 35-44
Abstract:
We present a measurement of the top quark pair (tt̄) production cross section (σtt̄) in pp̄ collisions at √s=1.96 TeV using 230 pb-1 of data collected by the DØ experiment at the Fermilab Tevatron Collider. We select events with one charged lepton (electron or muon), missing transverse energy, and jets in the final state. We employ lifetime-based b-jet identification techniques to further enhance the tt̄ purity of the selected sample. For a top quark mass of 175 GeV, we measure σtt̄=8.6-1.5+1.6(stat.+syst.) ±0.6(lumi.) pb, in agreement with the standard model expectation.Search for large extra spatial dimensions in dimuon production with the D0 detector
Physical Review Letters 95:16 (2005)
Abstract:
We present the results of a search for the effects of large extra spatial dimensions in pp_collisions at s=1.96TeV in events containing a pair of energetic muons. The data correspond to 246pb-1 of integrated luminosity collected by the D0 experiment at the Fermilab Tevatron Collider. Good agreement with the expected background was found, yielding no evidence for large extra dimensions. We set 95% C.L. lower limits on the fundamental Planck scale between 0.85 and 1.27 TeV within several formalisms. These are the most stringent limits achieved in the dimuon channel to date. © 2005 The American Physical Society.Search for large extra spatial dimensions in dimuon production with the d0 detector.
Phys Rev Lett 95:16 (2005) 161602