Diffraction and correlations at the LHC: definitions and observables

Details Diffraction and correlations at the LHC: definitions and observables Diffraction and correlations at the LHC: definitions and observables

2010-05-26

arxiv.org/abs/1005.4839v2

Eur.Phys.J.C69:85-93,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

19 pages, 8 figures; v2: minor changes, version accepted by EPJC

Scientific paper

10.1140/epjc/s10052-010-1392-5

We note that the definition of diffractive events is a matter of convention. We discuss two possible `definitions': one based on unitarity and the other on Large Rapidity Gaps (LRG) or Pomeron exchange. LRG can also arise from fluctuations and we quantify this effect and some of the related uncertainties. We find care must be taken in extracting the Pomeron contribution from LRG events. We show that long-range correlations in multiplicities can arise from the same multi-Pomeron diagrams that are responsible for LRG events, and explain how early LHC data can illuminate our understanding of `soft' interactions.

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