Physics:Fragmentation region

The small-angle (centre of mass) region of an interaction. Particles in the fragmentation region have momenta similar to the incident or target particle. Consequently one speaks about the beam fragmentation region, sometimes defined over a given range of rapidity like File:Hepb img329.gif where File:Hepb img330.gif and File:Hepb img331.gif 2, or about the target fragmentation region (defined similarly for negative y).