Nuclear structure functions and heavy flavour leptoproduction off the nucleus at small x in perturbative QCD |
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Authors: | N Armesto MA Braun |
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Institution: | (1) Departamento de Física, Módulo C2, Planta baja, Campus de Rabanales, Universidad de Córdoba, 14071 Córdoba, Spain, ES;(2) Departamento de Física de Partículas, Universidade de Santiago de Compostela, 15706 Santiago de Compostela, Spain, ES |
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Abstract: | 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 dependence of the structure functions is well described by a power factor , with 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 sizable up to transverse momenta larger than the initial large scale .
Received: 10 July 2001 / Revised version: 23 September 2001 / Published online: 5 November 2001 |
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Keywords: | |
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