| Abstract | Recent H1 measurements of the diffractive DIS cross section based on the
reconstruction of a large rapidity gap or the detection of the scattered
proton in the FPS or VFPS detectors have been used to extract a new set of
diffractive parton distribution functions. The NLO QCD fit fully exploits
the possibility that, according to the DDIS factorisation theorem which
holds at fixed x_pom, the parton content of the colourless exchange may
depend continuously on the x_pom variable. In particular the new fitting
strategy does not assume proton vertex factorisation nor inputs from Regge
theory in its x_pom dependence. The performance of the new QCD fit on
H1 preliminary data is presented as well as comparisons with diffractive
PDF parametrisations already present in the literature. |
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