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]
Survey of charge symmetry breaking operators for d d to alpha pi0
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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
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.