Abstract
The measurement of Single and Double Diffraction cross-sections in pp collisions by the ALICE Collaboration at √ s = 0.9, 2.76 and 7 TeV will be presented. The relevance of diffraction to the understanding of inelastic pp interactions will be discussed and the measurement of the inelastic pp cross-section will be presented. A brief status of ALICE’s studies of centrally produced systems, selected with a two-pseudorapidity gap topology, will also be given.
Highlights
The cross-sections of inelastic and diffractive processes in proton-proton collisions are among the basic obervables used to characterize the global properties of interactions
It is not possible to distinguish large rapidity gaps caused by Pomeron exchange from those caused by other colour-neutral exchanges
The analysis presented here is based on the data from the VZERO detector, the Silicon Pixel Detector (SPD) and the Forward Multiplicity Detector (FMD)
Summary
The cross-sections of inelastic and diffractive processes in proton-proton (pp) collisions are among the basic obervables used to characterize the global properties of interactions. Two contributions to the inelastic cross-section are diffractive processes and non-diffractive processes. Diffraction proceeds via the exchange of Pomerons. It is not possible to distinguish large rapidity gaps caused by Pomeron exchange from those caused by other colour-neutral exchanges. The separation of these processes is model dependent. In order to provide the dependence of Single Diffraction (SD) crosssection on diffracted mass, PYTHIA6 and PHOJET were modified to use the model [1]. ALICE measured inelastic, single- and double-diffraction cross-sections in pp collisions [2]
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