Colour Reconnections and Observable Features of Gluonic Colour Singlets in Z0 Decays

When several identical colour charges appear in gluon cascades, problems arise in describing the confinement structure. In model descriptions of gluon emissions and how partons couple some approximations may be less accurate, and neglected contributions may become important when equal colour charges interfere. These charges give rise to new interesting connections between the partons which result in a different distribution of the hadrons which are finally produced. Events which contain gluons with the same colour have some probability to form gluon singlets. Using the string picture several ways to draw the string are possible. A closed string of gluons can appear which would induce a gap in the rapidity distribution. This can be observed experimentally. Colour reconnection may also be important in the perturbative cascade of gluons. A dipole description may not be a good approximation of the gluon emissions when identical colour charges arise. Reconnecting the colour charges during t..