Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-07-10
Eur.Phys.J.C22:351-357,2001
Physics
High Energy Physics
High Energy Physics - Phenomenology
LaTeX2e, 16 pages, 6 eps figures included using epsfig; final version, some comments added, results and conclusions unchanged
Scientific paper
10.1007/s100520100796
Nuclear structure functions and cross-sections for heavy flavour production in lepton-nucleus collisions are investigated in the low $x$ region accessible now or in the near future. The scattering on a heavy nucleus is described by the sum of fan diagrams of BFKL pomerons, which is exact in the high-colour limit. The initial condition for the evolution at $x=0.01$ is taken from a saturation model, which reproduces the experimental data on the proton. The $A$ dependence of the structure functions is well described by a power factor $A^\alpha$, with $\alpha$ reaching values as low as 1/2 at extremely low $x$. The total cross-sections for heavy flavour production reach values of the order of mb, and the corresponding transverse momentum distributions are sizeable up to transverse momenta larger than the initial large scale $\sqrt{Q^2+4m_f^2}$.
Armesto Nestor
Braun Mikhail A.
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