1996/05/21 by S. Tapprogge, Tapprogge, S.
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #hep-ex
paper · pdf · doi:10.48550/arxiv.hep-ex/9605007
4 pages with 4 ps figures embedded, to appear in the Proceedings of the XXXIe Rencontres de Moriond, QCD and High Energy Hadronic Interactions (Les Arcs, France, March 1996)
arxiv created 1996/05/21 · arxiv updated 2009/11/30
New results on diffractive deep-inelastic e p scattering at HERA are presented using data taken in 1994 with the H1 detector. The cross section for diffractive deep-inelastic scattering is measured in terms of a diffractive structure function F2D(3)(β,Q2,\xpom) over an extended kinematic range. The dependence of F2D(3) on \xpom is found not to depend on Q2, but to depend on β. Therefore the \xpom dependence no longer factorizes. The Q2 and β dependence of F2D(3) is analyzed after an integration over the dependence on \xpom. For fixed β a clear rise with log Q2 is observed, persisting up to high values of β. In terms of the Altarelli-Parisi (DGLAP) QCD evolution equations, these scaling violations give clear indications for a gluon dominated process. Subsequently an attempt is made to quantify the parton content of the diffractive exchange using the DGLAP evolution. At the starting scale a ``leading'' gluon distribution is found which contributes about 80 % of the momentum in the diffractive exchange. Measurements of the hadronic final state (energy flow and production of D* mesons) are found to be consistent with the predictions of a model of deep-inelastic electron pomeron scattering using the information on the parton content obtained.