Eur. Phys. J. C (2003) 31: 73-89
https://doi.org/10.1140/epjc/s2003-01320-4

theoretical physics

Unintegrated parton distributions and inclusive jet productionat HERA

¹ Institute for Particle Physics Phenomenology, University of Durham, DH1 3LE, UK
² Petersburg Nuclear Physics Institute, 188300, Gatchina, St. Petersburg, Russia

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 k _t-factorisation to (z,k _t)-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.