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In this paper I show that it is possible to use Regge theory to constrain theinitial parton distribution functions of a global DGLAP fit. In this approach,both quarks and gluons have the same high-energy behaviour which may also beused to describe soft interactions. More precisely, I show that, if weparametrise the parton distributions with a triple-pole pomeron, {\em i.e.}like $\log^2(1/x)$ at small $x$, at $Q^2=Q_0^2$ and evolve these distributionwith the DGLAP equation, we can reproduce $F_2^p$, $F_2^d$, $F_2^n/F_2^p$,$F_2^{\nu N}$ and $xF_3^{\nu N}$ for $W^2\ge 12.5$ GeV$^2$. In this case, weobtain a new leading-order global QCD fit with a Regge-compatible initialcondition.  I shall also show that it is possible to use Regge theory to extend theparton distribution functions to small $Q^2$. This leads to a description ofthe structure functions over the whole $Q^2$ range based on Regge theory at low$Q^2$ and on QCD at large $Q^2$.  Finally, I shall argue that, at large $Q^2$, the parton distributionfunctions obtained from DGLAP evolution and containing an essential singularityat $j=1$ can be approximated by a triple-pole pomeron behaviour.Comment: 42 pages, 18 figure

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

Global QCD fit from<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>Q</mml:mi><mml:mn>2</mml:mn></mml:msup><mml:mo>=</mml:mo><mml:mn>0</mml:mn></mml:math>to<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>Q</mml:mi><mml:mn>2</mml:mn></mml:msup><mml:mo>=</mml:mo><mml:mn>30</mml:mn><mml:mtext> </mml:mtext><mml:mn>000</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:msup><mml:mi>GeV</mml:mi><mml:mn>2…

Global QCD fit fromQ2=0toQ2=30 000 GeV2…