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Energy Flow in Hard Diffractive DIS and Photoproduction |
| Reference |
Preliminary results expected for ICHEP2004, Summer 2004 |
| Figures |
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| Contact |
Stefan Schenk |
| Abstract |
The forward energy flow in hard diffractive interactions has been measured by
selecting events with a leading proton in the range $x_{I\!\!P} < 0.17$.
This measurement cannot be performed with the standard
'rapidity gap selection' of diffractive
events. The results are used to quantify the loss of diffractive events
by the rapidity gap selection, and to measure the effect of a rapidity gap
selection on the forward energy flow. The observations are compared
to predictions
of the Resolved Pomeron model and a Soft Color Interaction model. They
exhibit a very good agreement between the forward energy flow and the
predictions of the Resolved Pomeorn model.
The comparison of hard diffractive events in DIS and in photoproduction shows
no differences in the energy flow, which are expected in models used to
explain factorisation breaking as observed in diffractive $p ar p$
interactions. |
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