Abstract
This paper is mainly devoted to the presentation and discussion of formulas for the cross section of photon diffractive dissociation. The calculations which we present in a very detailed way are based on perturbative QCD. We improve formulas which describe this process in the triple Regge limit where the square of the missing mass ${\mathit{M}}_{\mathit{X}}$ (the invariant mass of the bunch of secondary hadrons) is much larger than \ensuremath{\Vert}${\mathit{Q}}^{2}$\ensuremath{\Vert} and extend the range of validity to the region where ${\mathit{M}}_{\mathit{X}}^{2}$ is of the same order as \ensuremath{\Vert}${\mathit{Q}}^{2}$\ensuremath{\Vert}. We introduce a diffractive dissociation structure function and show that it obeys the Gribov-Lipatov-Altarelli-Parisi evolution equation, but, with an additional inhomogeneous term. The relation to the Pomeron structure function is discussed.
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