
Diffractive JetProduction in DeepInelastic ep Collisions at HERA 
Reference 
FrankPeter Schilling, talk presented at DIS 2000; M Martinez, talk presented at ICHEP 2000, April 2000 
Document 
Conference paper

Figures 
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Contact 
FrankPeter Schilling 
Abstract 
A measurement is presented of dijet and 3jet cross sections in low$t$ diffractive deepinelastic scattering interactions of the type $ep
ightarrow eXY$, where the photon dissociation system $X$ is separated by a large rapidity gap from a leading lowmass baryonic system $Y$. Data taken in 1996 to 1997 with the H1 detector at HERA, corresponding to an integrated luminosity of $18.0
m\ pb^{1}$, are used to measure a comprehensive set of single and double differential cross sections in the kinematic range $44
m\ GeV$. The nature of the energy flow not attributed to the dijet system is also investigated. Viewed in terms of the diffractive scattering of parton fluctuations of the photon, the data require the dominance of $q\overline{q}g$ over $q\overline{q}$ states. They constrain the diffractive gluon distribution and require a large fraction of the colorless exchange momentum to be carried by gluons. The data are consistent with factorization of the $x_\pom$ dependence, a Pomeron intercept value of $lpha_\pom(0)=1.2$ and a sizeable fraction of events where the virtual photon is resolved. Soft color neutralization models can reproduce the shapes of the differential distributions but underestimate the cross section. A perturbative QCD calculation based on 2gluon exchange is in agreement with the data at low $x_\pom$ values. The 3jet cross sections are in excess of the model predictions. 
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