Unintegrated parton distributions and inclusive jet production at HERA
G. Watt, A. D. Martin, M. G. Ryskin
Abstract
We describe how unintegrated parton distributions can be calculated from conventional integrated distributions. We extend and improve the 'last-step' evolution approach, and explain why doubly-unintegrated parton distributions are necessary. We generalise kt-factorisation to (z,kt)-factorisation. We apply the formalism to inclusive jet production in deep-inelastic scattering, mainly at leading-order, but we also study the extension to next-to-leading order. We compare the predictions with recent HERA data.
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