Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-07-08
Phys.Rev.D78:094004,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
16 pages, 7 figures
Scientific paper
10.1103/PhysRevD.78.094004
We compare the inclusive transverse momentum spectra of single pions above pT = 3 GeV/c measured in proton-proton (p-p) collisions at sqrt(s) = 21.7 - 23.8 GeV, with next-to-leading order (NLO) perturbative QCD (pQCD) predictions using recent parametrizations of the parton densities and parton-to-pion fragmentation functions. Although the dependence on the theoretical scales is large, the calculations can reproduce the experimental results both in magnitude and shape. Based on the existing data and on a pQCD $\sqrt{s}$-rescaling of the measured spectra, we provide a practical parametrization of the baseline p-p pion transverse momentum spectrum to be compared to nucleus-nucleus collisions data at sqrt(s_NN) = 22.4 GeV.
Arleo François
d'Enterria David
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