I present a calculation of threshold soft-gluon corrections to single top production in pp̄ collisions via all partonic processes in the t and s channels and via associated top 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 (NNNLO) at ne...

A factorized and analytical form for the A(γ,pp) and A(e,epp) cross section is proposed. In the suggested scheme the two-proton knockout cross sections can be directly analyzed in terms of the ground-state correlation functions. Central, spin-spin and tensor correlations are considered. In the longitudinal channel, the (e,epp) cross section is predicted to exhibit a peculiar sensitivity to grou...

We present a theoretical and experimental study on increasing the sensitivity of ITP assays by varying channel cross-section. We present a simple, unsteady, diffusion-free model for plateau mode ITP in channels with axially varying cross-section. Our model takes into account detailed chemical equilibrium calculations and handles arbitrary variations in channel cross-section. We have validated o...

We report cross sections for low-energy elastic electron collisions with the diazabenzene molecule pyrazine, obtained from first-principles calculations. The integral elastic cross section exhibits three sharp peaks that are nominally shape resonances associated with trapping in the vacant * molecular orbitals. Although the two lowest-energy resonances do in fact prove to be nearly pure single-...

Mining nonmetallic sand, gravel, and river stones in a channel has previously caused damage to the itself surrounding environment. Technical studies are needed minimize mining channel. Ongkag Dumoga River is planned be location of non-metal material for gravel stone. The research method was carried out by geodesic mapping determine profile cross-section, hydrological analysis with return period...

The study of top quark pair production at the Tevatron is now entering the realm of precision physics. With 2.8 fb−1 of CDF data there are over 1200 reconstructed tt̄ events in the lepton + jets channel. As the integrated luminosity increases, it is possible to improve not only measurements of the properties of the top quark but also maybe to search for new physics by comparing the tt̄ cross sect...

The search for the electroweak production of top quarks is entering an exciting time: with the ever increasing luminosity furnished by the Tevatron pp̄ Collider at Fermilab and sophisticated analysis techniques we are now able to approach the expected standard model production cross section for this new mode of production. Using 370 pb of DØ data and likelihoods as discriminants to extract the s...