Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-11-19
Eur.Phys.J.C5:77-90,1998
Physics
High Energy Physics
High Energy Physics - Phenomenology
LaTeX, 40 pages, 9 figures
Scientific paper
10.1007/s100520050249
The spectrum of partons in a QCD jet becomes independent of the primary energy in the low momentum limit. This follows within the perturbative QCD from the colour coherence in soft gluon branching. Remarkably, the hadrons follow such behaviour closely, suggesting the parton hadron duality picture to be appropriate also for the low momentum particles. More generally, this scaling property holds for particles of low transverse and arbitrary longitudinal momentum, which explains an old experimental observation (``fan invariance''). Further tests of the perturbatively based picture for soft particle production are proposed for three-jet events in e+e- annihilation and di-jet production events in gamma p, gamma-gamma and p\bar p collisions. They are based upon the difference in the intensity of the soft radiation from primary q\bar q and gg antennae.
Khoze Valery A.
Lupia Sergio
Ochs Wolfgang
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