Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-04-14
Acta Phys.Polon. B34 (2003) 3191-3214
Physics
High Energy Physics
High Energy Physics - Phenomenology
27 pages, 14 figures To appear in the special issue of Acta Physica Polonica to celebrate the 65th Birthday of Prof. Jan Kwiec
Scientific paper
The inclusive distributions of gluons and pions are calculated with absolute normalization for high-energy nucleon-nucleon collisions. The results for several unintegrated gluon distributions from the literature are compared. The gluon distribution proposed recently by Kharzeev and Levin based on the idea of gluon saturation is tested against DIS data from HERA. We find huge differences in both rapidity and transverse momentum distributions of gluons and pions in nucleon-nucleon collisions for different models of unintegrated gluon distributions. The approximations used recently in the literature are discussed. The Karzeev-Levin gluon distribution gives extremely good description of momentum distribution of charged hadrons at midrapidities. Contrary to a recent claim in the literature, we find that the gluonic mechanism discussed does not describe the inclusive spectra of charged particles in the fragmentation region, i.e. in the region of large $|y|$ for any unintegrated gluon distribution from the literature.
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