Hard Processes on Nuclear Targets in QCD

Details Hard Processes on Nuclear Targets in QCD Hard Processes on Nuclear Targets in QCD

1996-09-09

arxiv.org/abs/hep-ph/9609296v2

Phys.Atom.Nucl. 61 (1998) 125-132; Yad.Fiz. 61 (1998) 134-141

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages in LaTeX plus 9 postscript figures; one short comment at the end of section 3 and one reference added

Scientific paper

We calculate the A-dependence of open charm and beauty as well as Drell-Yan pair production cross sections on nuclear targets taking into account the difference of quark and gluon distributions in free and bound nucleons. The results are presented for both proton-nucleus and nucleus-nucleus collisions. For the case of heavy flavour production at comparatively low energies, if $\sigma \sim A^{\alpha}$, the values of $\alpha$ are slightly higher than unity. With increasing energy $\alpha$ decreases in all cases and becomes smaller than unity. We also show $\alpha$ as a function of Feynman-$x$ of the produced $Q\overline{Q}$ or $l^+l^-$ pair and obtain that it decreases significantly in the beam fragmentation region. The sensitivity of our results to the used set of parton distributions is also discussed.

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