Exclusive final states in diffractive excitation

Christoffer Flensburg, Gösta Gustafson, Leif Lönnblad

Research output: Contribution to journalArticle


In this paper we describe a formalism for generating exclusive final states in diffractive excitation, based on the optical analogy where diffraction is fully determined by the absorption into inelastic channels. The formalism is based on the Good--Walker formalism for diffractive excitation, and it is assumed that the virtual parton cascades represent the diffractive eigenstates defined by a definite absorption amplitude. We emphasize that, although diffractive excitation is basically a quantum-mechanical phenomenon with strong interference effects, it is possible to calculate the different interfering components to the amplitude in an event generator, add them and thus calculate the reaction cross section for exclusive diffractive final states. The formalism is implemented in the DIPSY event generator, introducing no tunable parameters beyond what has been determined previously in studies of non-diffractive events. Some early results from DIS and proton-proton collisions are presented, and compared to experimental data.
Original languageEnglish
Article number115
JournalJournal of High Energy Physics
Issue number12
Publication statusPublished - 2012

Subject classification (UKÄ)

  • Subatomic Physics

Free keywords

  • Diffraction
  • Small-x physics
  • Saturation
  • Dipole Model
  • DIS


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