Dynamics of diffractive dissociation

We describe a QCD based model which incorporates the main properties of the inclusive particle distributions expected for diffractive processes, including the diffractive dissociation at high energies. We study, in turn, the total cross section, $$\sigma _\mathrm{tot}$$ σ tot , the differential elastic, $$d\sigma _\mathrm{el}/dt$$ d σ el / d t , cross section, the dependence of the single proton dissociation cross section, $$\xi d\sigma ^\mathrm{SD}/d\xi $$ ξ d σ SD / d ξ , on the momentum fraction, $$\xi =1-x_L$$ ξ = 1 - x L , lost by the leading proton, the multiplicity distributions in inelastic (non-diffractive) collisions and in the processes of dissociation. Besides this we calculate the mean transverse momenta of the ‘wee partons’ (secondaries) produced in the case of dissociation (that is in the processes with a large rapidity gap) and compare it with that in inelastic interactions.

Erratum to: Measurement of differential cross sections for single diffractive dissociation in $$ \sqrt{s} $$ = 8 TeV pp collisions using the ATLAS ALFA spectrometer

Figure 5b of the paper [1] contained a misinterpretation in the comparison between the reported new ATLAS measurement of the process pp → Xp and previously published CMS data [2]. The ATLAS measurement corresponds to cases where either proton dissociates.

Single and double diffractive dissociation and the problem of extraction of the proton–Pomeron cross-section

Diffractive dissociation processes are analyzed in the framework of covariant reggeization. We have considered the general form of hadronic tensor and its asymptotic behavior for [Formula: see text] in the case of conserved tensor currents before reggeization. Resulting expressions for differential cross-sections of single dissociation (SD) process [Formula: see text], double dissociation (DD) [Formula: see text] and for the proton–Pomeron cross-section are given in detail, and corresponding problems of the approach are discussed.