Search for single top quark production in pbar p collisions at sqrt{s}=1.96 TeV in the missing transverse energy plus jets topology

Abstract

We report a search for single top quark production with the CDF II detector using 2.1 fb-1 of integrated luminosity of pbar p collisions at sqrt{s}=1.96 TeV. The data selected consist of events characterized by large energy imbalance in the transverse plane and hadronic jets, and no identified electrons and muons, so the sample is enriched in W -> tau nu decays. In order to suppress backgrounds, additional kinematic and topological requirements are imposed through a neural network, and at least one of the jets must be identified as a b-quark jet. We measure an excess of signal-like events in agreement with the standard model prediction, but inconsistent with a model without single top quark production by 2.1 standard deviations (sigma), with a median expected sensitivity of 1.4 sigma. Assuming a top quark mass of 175 GeV/c2 and ascribing the excess to single top quark production, the cross section is measured to be 4.9+2.5-2.2(stat+syst)pb, consistent with measurements performed in independent datasets and with the standard model prediction.

arXiv commentsubmitted to Phys. Rev. D

References in corpus (24)

• New Generation of Parton Distributions with Uncertainties from Global QCD Analysis
• High-Energy-Physics Event Generation with PYTHIA 6.1
• Global QCD Analysis of Parton Structure of the Nucleon: CTEQ5 Parton Distributions
• MadGraph/MadEvent v4: The New Web Generation
• An update on vector boson pair production at hadron colliders
• Measurement of the J/Psi Meson and b-Hadron Production Cross Sections in ppbar Collisions at sqrt s = 1960 GeV
• Determination of the Jet Energy Scale at the Collider Detector at Fermilab
• The t-tbar cross-section at 1.8 and 1.96 TeV: a study of the systematics due to parton densities and scale dependence
• Single Top Production as a Window to Physics Beyond the Standard Model
• Observation of Single Top-Quark Production
• The fully differential single-top-quark cross section in next-to-leading order QCD
• Measurement of the ttbar Production Cross Section in ppbar Collisions at sqrt{s}=1.96 TeV using Lepton + Jets Events with Secondary Vertex b-tagging
• Measurements of Inclusive W and Z Cross Sections in p-pbar Collisions at sqrt{s} =1.96 TeV
• Understanding single-top-quark production and jets at hadron colliders
• Next-to-leading-order predictions for t-channel single-top production at hadron colliders
• Radiative corrections to Zb{\bar b} production
• Is Vtb=1 ?
• Evidence for production of single top quarks
• First Measurements of Inclusive W and Z Cross Sections from Run II of the Tevatron Collider
• Evidence for production of single top quarks and first direct measurement of |Vtb|
• Measurement of the ttbar Production Cross Section in ppbar collisions at sqrt{s} = 1.96 TeV using Lepton+Jets Events with Jet Probability b-tagging
• Diffraction Dissociation in Photoproduction at HERA
• Measurement of the Single Top Quark Production Cross Section at CDF
• Measurement of the $b$ Jet Cross Section in Events with a $Z$ Boson in $p\bar{p}$ Collisions at $\sqrt{s}$=1.96 TeV

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• Measurement of the ttbar production cross section in ppbar collisions at sqrt(s)=1.96 TeV using events with large missing transverse energy and jets
• Observation of Single Top Quark Production
• Observation of pseudoscalar and tensor resonances in $J/\psi \to \gamma \varphi \varphi$
• Updated Measurement of the Single Top Quark Production Cross Section and $Vtb$ in the Missing Transverse Energy Plus Jets Topology in $p\bar{p}$ Collisions at $\sqrt{s}=1.96$ TeV
• Measurements of the Production, Decay and Properties of the Top Quark: A Review
• Supersymmetry - When Theory Inspires Experimental Searches
• Search for a dijet resonance in events with jets and missing transverse energy in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV
• Studies of single top quark production at the Tevatron
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