https://doi.org/10.1140/epja/i2007-10461-y
Regular Article - Theoretical Physics
Neutron-neutron scattering length from the reaction γd → πnn employing chiral perturbation theory
1
Institut für Kernphysik, Forschungszentrum Jülich GmbH, D-52425, Jülich, Germany
2
Institute of Theoretical and Experimental Physics, B. Cheremushkinskaya 25, 117259, Moscow, Russia
3
Helmholtz-Institut für Strahlen- und Kernphysik (Theorie), Universität Bonn, Nußallee 14-16, D-53115, Bonn, Germany
* e-mail: j.haidenbauer@fz-juelich.de
Received:
31
May
2007
Accepted:
23
August
2007
Published online:
19
September
2007
We discuss the possibility to extract the neutron-neutron scattering length ann from experimental spectra on the reaction γd → π+ nn . The transition operator is calculated to high accuracy from chiral perturbation theory. We argue that for properly chosen kinematics, the theoretical uncertainty of the method can be as low as 0.1 fm.
PACS: 12.39.Fe Chiral Lagrangians – / 13.60.Le Meson production – / 13.75.Cs Nucleon-nucleon interactions (including antinucleons, deuterons, etc.) – / 25.20.Lj Photoproduction reactions –
© Società Italiana di Fisica and Springer-Verlag, 2007
