13 research outputs found
Heavy Quark Hadroproduction in -Factorization Approach with Unintegrated Gluon Distributions
We consider the processes of compare the heavy quark production using the
unintegrated gluon distributions. The numerical predictions for high energy
nucleon-nucleon and photon-nucleon collisions of the -factorization
approach (semihard theory) are compared with the experimental data from
Tevatron-collider and HERA. The total production cross sections and
distributions are considered and they are in reasonable agreement with the data
for rather value of QCD scale.Comment: 21 pages, 10 figures, references adde
Single top quark production in ATLAS at the LHC
Measurements of the single top quark production cross-sections in proton collisions with the ATLAS detector at the Large Hadron Collider are presented. The single top-quark production in the t and Wt-channels and the determination of the CKM matrix element |Vtb| are discussed. A separate measurement of the top and antitop quark cross-sections and their ratio is shown. These measurements are sensitive to the parton distribution function in the proton. In addition, limits on exotic production in single top quark processes are outlined. This also includes the search for flavour-changing neutral currents and for additional W’ bosons in the s-channel