A Numerical Estimate of the Small-$k_T$ Region in the BFKL Pomeron

Physics – High Energy Physics – High Energy Physics - Phenomenology

Scientific paper

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15 pages, latex, 9 figures ,revised version, some discussion added, one reference added, two figures removed, final version to

Scientific paper

10.1016/0370-2693(96)00115-3

A computer study is performed to estimate the influence of the small-$k_T$ region in the BFKL evolution equation. We consider the small-x region of the deep inelastic structure function $F_2$ and show that the magnitude of the small-$k_T$ region depends on $Q^2$ and $x_B$. We suggest that the width of the $\log k_T^2$-distribution in the final state may serve as an additional footprint of BFKL dynamics. For diffractive dissociation it is shown that the contribution of the infrared region is large - even for large $Q^2$. This contribution becomes smaller only if restrictions on the final state are imposed.

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