Top quarks are produced in pairs via the strong interaction. At the Tevatron, operating at 1.96 TeV in Run II, the expected production rate of tt pairs is 6.8±0.6 pb @ mt=175 GeV/c . Roughly 85% arise from qq interactions, while the remaining 15% are created by gluon fusion. As of February 4, 2007, 2.05 fb of data have been recorded by the D0 experiment. To study the properties of the top quark...

Educating people with special educational needs (SEN) is a hot topic these days. Many multimedia educational tools have been generated with the support of ICT to assist children receiving SEN education. Teaching supported by new technologies should guarantee contents accessibility. However, these tools are not 100% suitable because the adaptation process they implement does not take into accoun...

The question of who is and who is not a bilingual is more difficult to answer than it first appears. Bilingualism was long regarded as the equal mastery of two languages, a definition that still prevails in certain glossaries of linguistics. However, today's complex world requires a more exact definition and analysis of the competencies that community members require to interact with speakers o...

The next-to-leading order QCD corrections to the production of a W -boson in association with a jet containing a heavy quark are presented. The calculation is fully differential in the final state particle momenta and includes the mass of the heavy quark. We study for the case of the Tevatron the sensitivity of the cross section to the strange quark distribution function, the dependence of the ...

We study the inclusive production of Λ (Λ̄) in several high energy collision processes (e+e−, e±p, ν(ν̄)p, pp), in view of an accurate determination of the unpolarized and polarized fragmentation functions of a quark into a Λ (Λ̄). For polarized fragmentation functions the inaccuracy and the scarcity of present data do not allow to distinguish between various theoretical models. We will indicate h...

The top quark with its mass of about 172 GeV/c is the most massive fundamental particle observed by experiment. In this talk we highlight the most recent measurements of several top quark properties performed with the CDF detector based on data samples corresponding to integrated luminosities up to 1 fb. These results include a search for top quark pair production via new massive resonances, me...