A short, and definitely not a complete representation of η production processes on hadrons is given. First of all, the different ways of obtaining the πN → ηN and πN → ηN amplitudes are presented. After that, an overview of results obtained using these amplitudes as input for calculating processes like: N N → ηN N , pd → η 3 He, πd → ηN N and ηd, η 3 He and η 4 He as well as η-light nuclei bond...

The high energy limit of QCD is investigated in the generalized leading logarithmic approximation. We study unitarity corrections to the BFKL Pomeron containing t-channel states with up to six gluons. Special attention is given to the field theory structure of the corresponding multi–gluon amplitudes. We discuss the transition from two to six gluons in the t-channel.

We present the implementation of the dipole subtraction formalism for the real radiation contributions to any next-to-leading order QCD process in the MadGraph/MadEvent framework. Both massless and massive dipoles are considered. Starting from a specific (n+1)-particle process the package provides a Fortran code for all possible dipoles to all Born processes that constitute the subtraction term...

A single very deep 10 0 eld has been imaged to r 26. There are 2682 galaxies with 23 r 26 with a size signiicantly larger than the seeing disk in the eld. After correcting for telescope aberrations, possible guiding errors, and signal degradation due to seeing, I nd a polarization signal of amplitude jpj = 2:7%, with an uncertainty of 1.2% (95% conndence limit). For the 1773 galaxies with 23 r ...