نتایج جستجو برای: leaf cross section
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plastic" to study the body's appearance in cross section using a drawing device to trace the fluoroscopic image on paper. After some time the method fell into disuse. In 1942 Prof. Yoshihiko Koga * began using another method to study the chest in which multiple exposures were made with the body rotated systematically through numerous angles. At the time the name rotating radiography was used. U...
Upper limits on the cross section for Standard Model Higgs-boson production in p¯ p → H + X at √ s = 1.96 TeV are determined for 100 < mH < 200 GeV/c 2. The contributing production processes include associated production (W H → νb ¯ b, ZH → /ννb ¯ b) and gluon fusion (H → W + W −). Analyses are conducted with integrated luminosities from 0.84 fb −1 to 1.05 fb −1 recorded by the DØ experiment. L...
Searches for standard model Higgs boson production in p¯ p collisions at √ s = 1.96 TeV have been carried out for Higgs boson masses (mH) in the range 100 < mH < 200 GeV/c 2. Analyses are conducted with integrated luminosities from 1.1 fb −1 to 3.0 fb −1. As no significant excess is observed, we proceed to set limits on standard model Higgs boson production. The observed 95% confidence level up...
Top quark pair production cross section has been measured at the Tevatron by CDF and DØ collaborations using different channels and methods, in order to test standard model predictions, and to search for new physics hints affecting the tt̄ production mechanism or decay. Measurements are carried out with an integrated luminosity of 1.0 to 2.0 fb, and are found to be consistent with standard model...
I present a calculation of threshold soft-gluon corrections to single top quark production in pp̄ collisions via all partonic processes in the t and s channels and via associated top quark and W boson production. The soft-gluon corrections are formally resummed to all orders, and finite-order expansions of the resummed cross section are calculated through next-to-next-to-next-to-leading order (N...
We propose a procedure to measure the Z 0 line shape and take full advantage of the superb performance of the CERN e + e − Collider LEP. A precise determination of the total cross section at 5 energies is needed for a model-independent analysis of the data and for a precision test of the QED initial state radiation from the fully inclusive hadronic channel.
A combination is presented of the inclusive diffractive cross section measurements made by the H1 and ZEUS Collaborations at HERA. The analysis uses diffractive deep inelastic scattering data selected by means of proton spectrometers. Correlations of systematic uncertainties are taken into account by the combination method, resulting in improved precision.
An overview of the preliminary results of the top quark pair production cross section measurements at a center-of-mass energy of 1.96 TeV carried out by the CDF and DØ collaborations is presented. The data samples used for the analyses are collected in the current Tevatron run and correspond to an integrated luminosity from 360 pb −1 up to 760 pb −1 .
The X(3872) is universally accepted to be an exotic hadron. In this letter we assume that the X(3872) is a D 0 ¯ D * 0 molecule, as claimed by many authors, and attempt an estimate of its prompt production cross section at Tevatron. A comparison with CDF data allows to draw some qualitative conclusions about this statement.
A. P. Tonchev,1 C. T. Angell,2 M. Boswell,2 A. S. Crowell,1 B. Fallin,1 S. Hammond,2 C. R. Howell,1 A. Hutcheson,1 H. J. Karwowski,2 J. H. Kelley,3 R. S. Pedroni,4 and W. Tornow1 1Duke University and TUNL, Durham, NC 27708, USA 2University of North Carolina at Chapel Hill and TUNL, Chapel Hill, North Carolina 27599, USA 3North Carolina State University and TUNL, Raleigh, North Carolina 27695, U...
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