Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 7
Book Description
Search for Resonant T Anti-t Production in P Anti-p Collisions at S**1/2
Author: Search for Resonant T Anti-t Production in P Anti-p Collisions at S**ư
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 7
Book Description
We report on a search for narrow-width particles decaying to a top and antitop quark pair. The data set used in the analysis corresponds to an integrated luminosity of 680 pb−1 collected with the Collider Detector at Fermilab in Run II. We present 95% confidence level upper limits on the cross section times branching ratio. Assuming a specific top color-assisted technicolor production model, the leptophobic Z′ with width?{sub Z{prime}} = 0.012M{sub Z{prime}}, we exclude the mass range M{sub Z{prime}}
Search for the Production of Narrow T Anti-b Resonances in 1.9 Fb-1 of P Anti-p Collisions at S**1/2
Author: Nuclear Science Abstracts
Author: Measurement of the T Anti-t Production Cross Section in P Anti-p Collisions at S**1/2
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 7
Book Description
We present a measurement of the top quark pair (t{bar t}) production cross section ([sigma]{sub t{bar t}}) in p{bar p} collisions at √s = 1.96 TeV using 230 pb−1 of data collected by the D0 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 t{bar t} purity of the selected sample. For a top quark mass of 175 GeV, we measure [sigma]{sub t{bar t}} = 8.6{sub -1.5}{sup +1.6}(stat. + syst.) ± 0.6 (lumi.) pb, in agreement with the standard model expectation.
Measurement of the T Anti-t Production Cross Section in P Anti-p Collisions at S**(1/2)
Author: Heather Lynn RayPublisher:
ISBN:
Category :
Languages : en
Pages : 172
Book Description
The direct observation of the top quark was first achieved at the Tevatron proton anti-proton collider at Fermilab. This discovery completed the third generation quark sector where the top quark is expected to accompany the bottom quark in the weak isospin doublet. This dissertation discusses the experimental verification of the production cross section as predicted by the Standard Model. A measurement of the t{bar t} production cross section using 107.9 pb{sup -1} of p{bar p} collisions at {radical}s = 1.96 TeV collected with the Collider Detector at Fermilab between March of 2003 and June of 2003 is presented. The measurement focuses on the t{bar t} production in the ''lepton plus jets'' final state in which one of the W bosons from the t{bar t} decay subsequently decays leptonically to an electron or a muon, and the other decays hadronically. The B-tagging technique which utilizes the precision silicon detector tracking is used to enhance the signal for t{bar t} events relative to the background through identification of the bottom quark from its measurable lifetime. The t{bar t} production cross section is measured to be {sigma}{sub t{bar t}} = 4.5 {+-} 1.4(stat) {+-} 0.8(sys) pb.
Measurement of the P Anti-p --] T Anti-t Production Cross Section at S**1/2
![Measurement of the P Anti-p --] T Anti-t Production Cross Section at S**1/2 PDF](https://books.google.com/books/content/images/frontcover/TcicnQAACAAJ?fife=w80-h100)
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 10
Book Description
A measurement of the top quark pair production cross section in proton anti-proton collisions at an interaction energy of √s = 1.96 TeV is presented. This analysis uses 405 pb−1 of data collected with the D0 detector at the Fermilab Tevatron Collider. Fully hadronic t{bar t} decays with final states of six or more jets are separated from the multijet background using secondary vertex tagging and a neural network. The t{bar t} cross section is measured as [sigma]{sub t{bar t}} = 4.5{sub -1.9}{sup +2.0}(stat){sub -1.1}{sup +1.4}(syst) ± 0.3(lumi) pb for a top quark mass of m{sub t} = 175 GeV/c2.
Nuclear Science Abstracts
Author: Measurement of the T Anti-t Production Cross Section in P-pbar Collisions at S**(1/2)
Author: A Measurement of the T Anti-t Production Cross-section in Proton Anti-proton Collisions at S**(1/2)
Author: Markus KlutePublisher:
ISBN:
Category :
Languages : en
Pages : 170
Book Description
A preliminary measurement of the t{bar t} production cross section at {radical}s = 1.96 TeV is presented. The {mu}-plus-jets final state is analyzed in a data sample of 94 pb{sup -1} and a total of 14 events are selected with a background expectation of 11.7 {+-} 1.9 events. The measurement yields: {sigma}{sub p{bar p} {yields} t{bar t} + X} = 2.4{sub -3.5}{sup +4.2}(stat.){sub -2.6}{sup +2.5}(syst.) {+-} 0.3(lumi.) pb. The analysis, being part of a larger effort to re-observe the top quark in Tevatron Run II data and to measure the production cross section, is combined with results from all available analyses channels. The combined result yields: {sigma}{sub p{bar p}} {yields} t{bar t} + X = 8.1{sub -2.0}{sup +2.2}(stat.){sub -1.4}{sup +1.6}(syst.) {+-} 0.8(lumi.) pb.