743 research outputs found
Combined Tevatron upper limit on ggâHâW+W- and constraints on the Higgs boson mass in fourth-generation fermion models
Search for Randall-Sundrum gravitons in the dielectron and diphoton final states with 5.4 fb-1 of data from ppÌ collisions at âs=1.96 TeV
Search for the associated production of a b quark and a neutral supersymmetric Higgs boson that decays into tau pairs
Search for Higgs boson production in dilepton and missing energy final states with 5.4 fb-1 of pp- collisions at Sqrt s=1.96 TeV
Measurement of the inclusive jet cross section in ppÌ collisions at âs= 1.96 TeV
We present a measurement of the inclusive jet cross section using the Run II cone algorithm and data collected by the D0 experiment in ppÌ
collisions at a center-of-mass energy âs= 1.96 TeV, corresponding to an integrated luminosity of 0.70 fb-1. The jet energy calibration and the method used to extract the inclusive jet cross section are described.We discuss the main uncertainties, which are dominated by the jet energy scale uncertainty. The results cover jet transverse momenta from 50 GeV to 600 GeV with jet rapidities in the range -2.4 to 2.4 and are compared to predictions using recent proton parton distribution functions. Studies of correlations between systematic uncertainties in transverse momentum and rapidity are presented
Measurement of the t-channel single top quark production cross section
The D0 collaboration reports direct evidence for electroweak production of
single top quarks through the t-channel exchange of a virtual W boson. This is
the first analysis to isolate an individual single top quark production
channel. We select events containing an isolated electron or muon, missing
transverse energy, and two, three or four jets from 2.3 fb^-1 of ppbar
collisions at the Fermilab Tevatron Collider. One or two of the jets are
identified as containing a b hadron. We combine three multivariate techniques
optimized for the t-channel process to measure the t- and s-channel cross
sections simultaneously. We measure cross sections of 3.14 +0.94 -0.80 pb for
the t-channel and 1.05 +-0.81 pb for the s-channel. The measured t-channel
result is found to have a significance of 4.8 standard deviations and is
consistent with the standard model prediction.Comment: 7 pages, 6 figure
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