On the Phase Space Partition in High Energy Collisions

الأصل · EN

In high energy hadron-hadron and e+e- collisions, to isolate a part of the phase space in multi-hadron final states is necessary for exploring the underlying dynamics. It is shown that the partition of phase space according to the value of rapidity, popularly used in hadron-hadron collisions, is inappropriate for the study of e+e- collisions. The proper way in the latter case is to identify the visible jets and take them as objects for detailed study, forming an extended phase space. The value ycut(0) of the distance-measure for the identification of visible jets is determined. A new variable r is introduced to further partition the phase space inside jets, which possesses a very good anomalous scaling property, showing that the r-distribution inside jets is a self-similar fractal.