• Medientyp: E-Artikel
  • Titel: Survey of charge symmetry breaking operators for d d to alpha pi0
  • Beteiligte: Gardestig, A. [VerfasserIn]; Horowitz, C. J. [VerfasserIn]; Nogga, A. [VerfasserIn]; Fonseca, A. C. [VerfasserIn]; Hanhart, C. [VerfasserIn]; Miller, G. A. [VerfasserIn]; Niskanen, J. A. [VerfasserIn]; van Kolck, U. [VerfasserIn]
  • Erschienen: Inst., 2004
  • Erschienen in: Physical review / C 69, 044606 (2004). doi:10.1103/PhysRevC.69.044606
  • Sprache: Englisch
  • DOI: https://doi.org/10.1103/PhysRevC.69.044606
  • ISSN: 0556-2813
  • Schlagwörter: Feynman graph: higher-order ; amplitude analysis ; deuteron deuteron: fusion ; perturbation theory: chiral ; helium ; bibliography ; effective Lagrangian ; deuteron deuteron --> helium pi0 ; charge: symmetry breaking ; numerical calculations
  • Entstehung:
  • Anmerkungen: Diese Datenquelle enthält auch Bestandsnachweise, die nicht zu einem Volltext führen.
  • Beschreibung: The charge symmetry breaking amplitudes for the recently observed dd-->alphapi(0) reaction are investigated. Chiral perturbation theory is used to classify and identify the leading-order terms. Specific forms of the related one- and two-body tree-level diagrams are derived. As a first step toward a full calculation, a few tree-level two-body diagrams are evaluated at each considered order, using a simplified set of d and alpha wave functions and a plane-wave approximation for the initial dd state. The leading-order pion-exchange term is shown to be suppressed in this model because of poor overlap of the initial and final states. The higher-order one-body and short-range (heavy-meson-exchange) amplitudes provide better matching between the initial and final states and therefore contribute significantly and coherently to the cross section. The consequences this might have for a full calculation, with realistic wave functions and a more complete set of amplitudes, are discussed.
  • Zugangsstatus: Freier Zugang