Neutron-neutron scattering length from the reaction gamma d --> pi^+ nn employing chiral perturbation theory

Abstract

We discuss the possibility to extract the neutron-neutron scattering length a_{nn} from experimental spectra on the reaction gamma d --> pi^+ 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.

14 pages, 8 figures

References in corpus (3)

• How low-energy weak reactions can constrain three-nucleon forces and the neutron-neutron scattering length
• Chiral O(Q^4) two-body operators for s-wave pion photoproduction on the NN system
• Lambda-N scattering length from the reaction gamma d -> K^+ Lambda n

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