Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-11-10
Acta Phys.Polon.B41:2839-2858,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
20 pages, 5 figures, presented at the 50th Cracow School of Theoretical Physics, 9-19 June 2010, Zakopane, Poland
Scientific paper
We present some basic elements of the treatment of particle multiplicities in jets from high energy collisions within perturbative QCD. Then we discuss the universal features of the inclusive particle spectrum for the limiting case of momentum p\to 0 (or p_T\to 0) as expected from soft QCD gluon bremsstrahlung. The energy independence of the invariant particle density in this limit I_0=E dN/d^3p|_{p\to 0} is predicted as well as the dependence of this quantity on the the colour factors characteristic of the underlying partonic processes. These properties are first recalled from e+e- collisions and then extended to pp and nuclear collisions according to Ref. 1. Present data support these predictions. It will be interesting to see whether new incoherent contributions show up in the new energy regime of LHC.
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