Fermi motion and nuclear modification factor

Details Fermi motion and nuclear modification factor Fermi motion and nuclear modification factor

2003-11-07

arxiv.org/abs/nucl-th/0311025v2

Mod.Phys.Lett. A19 (2004) 1669-1680

Physics

Nuclear Physics

Nuclear Theory

16 pages + 6 figures, some calculations have been corrected, text has been modified accordingly, 1 figure has been added, in p

Scientific paper

10.1142/S021773230401494X

It has been argued recently that the so-called nuclear modification factor ($R_{AA}$) is an observable useful for identifying the quark-gluon plasma. We discuss the effect of Fermi motion in nuclei on $R_{AA}$ at CERN SPS and BNL RHIC energies. Contrary to the simple intuition, rather large effects are found for CERN SPS. The Fermi motion in nuclei contributes significantly to the Cronin effect. The effect found is qualitatively similar to the one observed experimentally at CERN energies and similar to the one obtained in the models of multiple scattering of initial partons. We predict different size of the effect for different types of hadrons, especially at low energies.

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