Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1992-10-27
Acta Phys.Polon.B23:1145-1162,1992
Physics
High Energy Physics
High Energy Physics - Phenomenology
(Lectures at the XXXII Cracow School of Theoretical Physics, Zakopane 1992), 22 pages, 7 figures not included (available on re
Scientific paper
In heavy quark production at large Feynman $x$ there are two hardness scales, one given by the heavy quark pair mass $\M^2$\ and the other by $\Lambda_{QCD}^2/(1-x)$. When these two scales are comparable, the twist expansion of Perturbative QCD breaks down. We discuss the dynamics in this new QCD limit, where $\mu^2=\M^2(1-x)$ is held fixed as $\M^2\to \infty$. New diagrams are found to contribute, which can enhance the cross section above that expected for leading twist. The heavy quarks are produced by a peripheral scattering on the target of hardness $\mu^2$. This leads, in particular, to a nuclear target dependence of $A^{2/3}$ at small $\mu$. Qualitatively, the dynamics in the new limit agrees with earlier phenomenological models of ``intrinsic'' heavy quark production.
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