Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-06-24
Nucl.Phys. A661 (1999) 645-648
Physics
High Energy Physics
High Energy Physics - Phenomenology
Talk in Quark Matter '99, 5 pages, includes 3 eps-figures
Scientific paper
Nuclear parton distributions $f_A(x,Q^2)$ are studied within a framework of the DGLAP evolution. Measurements of $F_2^A/F_2^D$ in deep inelastic $lA$ collisions, and Drell--Yan dilepton cross sections measured in $pA$ collisions are used as constraints. Also conservation of momentum and baryon number is required. It is shown that the calculated $Q^2$ evolution of $F_2^{\rm Sn}/F_2^{\rm C}$ agrees very well with the recent NMC data, and that the ratios $R_f^A=f_A/f$ are only moderately sensitive to the choice of a specific modern set of free parton distributions. For general use, we offer a numerical parametrization of $R_f^A(x,Q^2)$ for all parton flavours $f$ in $A>2$, and at $10^{-6}\le x \le 1$ and $2.25 {\rm GeV}^2\le Q^2\le 10^4 {\rm GeV}^2$.
Eskola Kari. J.
Kolhinen Vesa J.
Ruuskanen P. V.
Salgado Carlos A.
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